Showing papers on "Selective reduction published in 2017"
TL;DR: In this paper, a direct hydrothermal synthesis approach to Fe/ZSM-5 zeolites was developed by using a ferric complex, i.e., ethylenediaminetetraacetic acid ferric sodium (EDTA-FeNa), as both an iron source and a structure-directing agent.
66 citations
TL;DR: An artificial leaf consisting of abundant and nontoxic natural elements and represents the first achievement of stoichiometric CO2 reduction using water as an electron donor by a free-standing natural leaflike plate form is presented.
Abstract: Thin film of SrTiO3 nanorods loaded with reduction and oxidation cocatalysts drove the selective reduction of carbon dioxide (CO2) into carbon monoxide (CO), as well as caused the production of equivalent oxygen molecules through water oxidation under UV irradiation. The described film functioned as a free-standing plate without any bias potential application, similar to a natural leaf. The film was facilely fabricated by a simple hydrothermal and annealing treatment of a titanium substrate to produce the SrTiO3 nanorod film (STO film) followed by two steps of loading the reduction and oxidation cocatalysts onto the surface of the STO. As a reduction cocatalyst, a CuxO nanocluster was chosen to achieve selective reduction of CO2 into CO, whereas a cobalt- and phosphate-based cocatalyst (CoPi) facilitated oxidation on the STO surface to promote oxygen generation. For the photocatalysis test, a wireless film was simply set into an aqueous solution bubbled with CO2 in a reactor, and CO production was observe...
33 citations
TL;DR: In this article, a bimetallic catalysts supported by nanocrystalline beta zeolite (NBeta) was firstly developed for the complete and selective reduction of nitrate to environment-friendly nitrogen.
32 citations
TL;DR: In this article, gold nanoparticles on hydrotalcite (HT) support were used to catalyze the reduction under visible light irradiation at ambient temperature; and phosphate (PO43−) and metal (such as Ga3+, Fe3+, Zn2+) ions were incorporated into the HT support to moderate the reduction power of the catalyst avoiding the formation of azo- and aniline compounds.
Abstract: It is a challenge to attain high selectivity to azoxy-compounds in the reduction of aromatic nitro compounds as azoxy-compounds can be readily reduced to azo- and aniline compounds. We proposed a new solution to this challenge: gold nanoparticles (AuNPs) on hydrotalcite (HT) support were used to catalyze the reduction under visible light irradiation at ambient temperature; and phosphate (PO43−) and metal (such as Ga3+, Fe3+, Zn2+) ions were incorporated into the HT support to moderate the reduction power of the catalyst avoiding the formation of azo- and aniline compounds. Very high azoxy-compound selectivity was achieved under green mild conditions. The photocatalytic activity strongly depends on the incident light wavelength and intensity, and we can further enhance the catalytic efficiency of this photocatalytic process by slight increase in reaction temperature (e.g. 10–20 °C). Moreover, high stability and recyclability of the catalyst were also observed under the investigated conditions. A plausible reaction mechanism was proposed based on the experimental results and literatures. The introduction of both phosphate and metal ions into HT support can prevent the further reduction of azoxy-compounds to azo-compounds or anilines and achieve excellent selectivity to azoxy-compounds. This study reveals that we may engineer a product chemoselectivity by tailoring the supporting materials, and may present a new strategy towards the development of versatile heterogeneous photocatalysts.
27 citations
TL;DR: In this article, the catalytic activity of supported silver nanoparticles on mesoporous silica was studied, for the selective reduction of azines into benzyl hydrazones using sodium borohydride as mild reducing agent.
Abstract: The catalytic activity of supported silver nanoparticles on mesoporous silica was studied, for the selective reduction of azines into benzyl hydrazones using sodium borohydride as mild reducing agent. Different sizes of silver nanoparticles supported on mesoporous silica (Ag/HMS) were successfully prepared by two methods, i.e. wet impregnation followed by reduction with hydrogen at 350oC and in situ deposition/reduction with a mixture of amines (ethanolamine and ethylenediamine). The Ag/HMS (amines) catalyst was found to promote the selective 1,2-reduction of aryl-substituted azines, compared to the corresponding 1,4-reduction that occurs in general reduction processes. This catalytic transfer hydrogenation process found to be clear, fast and quantitative (>99% yields and selectivity) towards benzyl hydrazones synthesis under mild conditions. Of great importance is that under the present catalytic conditions reducible functional groups remain intact. Formal kinetics, support the in situ formation of silver-hydride species being responsible for the reduction process. The presence of protic polar methanol enhanced the catalytic activity of Ag/HMS. Based on the recycling studies the catalytic system Ag/HMS-NaBH4 was found to catalyze the selective reduction of azines nine times without significant loss of its activity. Finally, one-pot reaction between the in situ produced benzyl hydrazones and a series of nitrostyrenes readily provided the regioselective synthesis of 1,3,5,-subtituted pyrazoles, highlighting a useful synthetic application of the catalytic protocol.
23 citations
TL;DR: In this article, the role of catalysts for the selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO) and the selective reduction of NO with ammonia (NH 3-SCR) was investigated.
Abstract: Hydrotalcite originated mixed metal Cu–Mg–Al oxide system was doped with various amounts of cerium (0.5 or 3.0 wt%) and tested in the role of catalysts for the selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO) and the selective catalytic reduction of NO with ammonia (NH3-SCR). The activating effect of cerium was observed in both studied processes. However, the CeO2 loading is a very important parameter determining catalytic performance of the studied samples. It was shown that an introduction of cerium into Cu–Mg–Al mixed oxide resulted in its significant activation in the low-temperature NH3-SCR process, independently of the CeO2 loading and a decrease in the efficiency of the NO reduction at higher temperatures, which was more significant for the catalyst with the lower cerium content. In the case of the NH3-SCO process, the introduction of cerium into Cu–Mg–Al mixed oxide resulted in the activation of the low temperature reaction, which was more intensive for the catalyst with lower cerium content. These effects were related to the presence of cerium in the form of crystallites of various size and therefore their different reducibility.
18 citations
TL;DR: In this paper, a homogeneous deposition precipitation (H-ZSM-5 was used as a catalyst for the selective reduction of NO with ammonia (NH3-SCR) reaction.
Abstract: H-ZSM-5 was modified with transition metals (including Fe, Cu, Mn, and Co) by homogeneous deposition precipitation (HDP) method and tested as catalyst for the selective reduction of NO with ammonia (NH3-SCR). The selectivity to N2 was higher than 95% in all the nanocatalysts and the NO conversion over nanocatalysts decreased in the following sequence Cu-ZSM-5 > Mn-ZSM-5 > Co-ZSM-5 > Fe-ZSM-5 at 200-300°C. The Cu-ZSM-5 catalyst showed the highest catalytic activity, 95% of NO conversion at 300°C, among the catalysts investigated. The nature of the active sites was characterized by BET, TEM, H2-TPR, and NH3-TPD. Characterization results revealed that acidity and the redox properties of the catalysts play an important role in achieving high activity for NH3-SCR reaction. The highest catalytic activity of Cu/ZSM-5 can be correlated to easy reducibility of Cu species and strong acidic sites created by the Cu species. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 1049–1055, 2017
18 citations
TL;DR: In this paper, an optimized combination of Zn and NH4Cl was used for the selective reduction of aldehydes and ketones to the corresponding alcohols, where the aldehyde and keto groups were selectively reduced in the presence of azide, cyano, epoxy, ester, and carbon carbon double-bond functional groups.
18 citations
TL;DR: In this paper, it was observed that pyridinium is hydrogenated at Pt electrodes in electrochemical conditions consistent with those previously shown to yield selective reduction of carbon dioxide to methanol and formic acid.
15 citations
TL;DR: In this paper, an efficient catalytic system for the reduction of nitroarenes to amines was developed using a well defined nickel-NHC (N−heterocyclic carbene) complex as catalyst and phenylsilane as reducing agent.
Abstract: An efficient catalytic system for the reduction of nitroarenes to amines was developed using a well‐defined nickel–NHC (N‐heterocyclic carbene) complex as catalyst and phenylsilane as reducing agent. The excellent activity of the catalyst provides access to anilines containing a wide array of reactive functionalities at 20 °C, and without using any base or additive. Notably, the catalytic system allows the reduction of 5,10,15,20‐tetra‐(nitrophenyl)porphyrin (TNPP) and CuII β‐nitroporphyrin to the corresponding aminoporphyrins.
14 citations
TL;DR: In this paper, carbon blacks serve as effective metal-free catalysts for the selective hydrogenation of carbon-carbon multiple bonds under aerobic conditions using hydrazine as the terminal reductant.
Abstract: Commercially available carbon blacks serve as effective metal-free catalysts for the selective hydrogenation of carbon–carbon multiple bonds under aerobic conditions using hydrazine as the terminal reductant. The reaction, which proceeds through a putative diimide intermediate, displays high tolerance to a variety of functional groups, including those sensitive to nucleophilic displacement by hydrazine, aerobic oxidation, or hydrazine-mediated reduction. Hydrazine chemisorbs strongly to the carbon surface, attenuating its native oxidative reactivity and allowing for selective hydrogenation. The catalytic sequence established here effectively umpolungs the reactivity of carbon, thereby enabling the use of this low-cost material in selective reduction catalysis.
TL;DR: The 15 mol% Cu/Al 2 O 3 catalysts with different Mn doping (05, 10, 15, mol%) were prepared using PEG-300 surfactant following evaporation-induced self-assembly (EISA) method in flowing air conditions at 500 oC as mentioned in this paper, where the catalysts were characterized by X-ray Diffraction (XRD), XPS, Scanning Electron Microscope Energy Dispersive X-Ray (SEM-EDX), Fourier Transform Infra Red (FTIR), and N 2 physisor
Abstract: The 15 mol% Cu/Al 2 O 3 catalysts with different Mn doping (05, 10, 15, mol%) were prepared using PEG-300 surfactant following evaporation-induced self-assembly (EISA) method Calcination of precursors were performed in flowing air conditions at 500 oC The catalysts were characterized by X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscope Energy Dispersive X-Ray (SEM-EDX), Fourier Transform Infra Red (FTIR), and N 2 physisorption The catalysts activities were evaluated for H 2 assisted LPG-SCR of NO in a packed bed tubular flow reactor with 200 mg catalyst under the following conditions: 500 ppm NO, 8 % O 2 , 1000 ppm LPG, 1 % H 2 in Ar with total flow rate of 100 mL/min Characterization of the catalysts revealed that surface area of 456-503 m 2 /g, narrow pore size distribution (1-2 nm), nano-size crystallites, Cu 2+ and Mn 2+ phases were principal active components Hydrogen enhanced significantly selective reduction of NO to N 2 with LPG over 10 mol % Mn-Cu/Al 2 O 3 giving 9556 % NO reduction at 150 oC It was proposed that the synergistic interaction between H 2 and LPG substantially widened the NO reduction temperature window and a considerable increase in both activity and selectivity Negligible loss of catalyst activity was observed for the 50 h of stream on run experiment at 150 oC The narrow pore size distribution, thermal stability of the catalyst and optimum Mn doping ensures good dispersion of Cu and Mn over Al 2 O 3 that improved NO reduction in H 2 -LPG SCR system Copyright © 2017 BCREC Group All rights reserved Received: 5 th January 2017; Revised: 20 th May 2017; Accepted: 20 th May 2017 ; Available online: 27 th October 2017; Published regularly : December 2017 How to Cite: Yadav, D, Kavaiya, AR, Mohan, D, Prasad, R (2017) Low Temperature Selective Catalytic Reduction (SCR) of NOx Emissions by Mn-doped Cu/Al 2 O 3 Catalysts Bulletin of Chemical Reaction Engineering & Catalysis , 12 (3): 415-429 (doi:109767/bcrec123895415-429)
TL;DR: In this article, a Pd-NiO/Y(Ba) 2 O 3 developed catalyst shows high activity to selective NO x reduction into N 2 (yield ~ 70%) with C 3 H 6 under oxygen excess conditions.
TL;DR: In this article, a photoenhanced selective hydrogenation of nitroarenes was performed using a Pt-ZnO hybrid catalysts, which exhibited a good catalytic performance under UV irradiation.
Abstract: Pt–ZnO hybrid catalysts were synthesized via a facile wet chemical method for use in the photoenhanced selective hydrogenation of nitroarenes. The Pt–ZnO hybrid exhibited a good catalytic performance under UV irradiation. The reaction rate constant for the reduction of o-nitroaniline was significantly increased more than eight times upon UV illumination. This resulted from the increased photo-excited electron transport from ZnO to Pt interface, making electrons strongly perturb at the Pt surface to enhance hydrogen dissociation. Furthermore, we investigated the durable cyclic catalytic performance of the Pt–ZnO hybrid.
Journal Article•
TL;DR: In this paper, gold nanoparticles on hydrotalcite (HT) support were used to catalyze the reduction under visible light irradiation at ambient temperature; and phosphate (PO4 3 −) and metal ions were incorporated into the HT support to moderate the reduction power of the catalyst avoiding the formation of azo- and aniline compounds.
Abstract: It is a challenge to attain high selectivity to azoxy-compounds in the reduction of aromatic nitro compounds as azoxy-compounds can be readily reduced to azo- and aniline compounds. We proposed a new solution to this challenge: gold nanoparticles (AuNPs) on hydrotalcite (HT) support were used to catalyze the reduction under visible light irradiation at ambient temperature; and phosphate (PO4 3 −) and metal (such as Ga 3 +, Fe 3 +, Zn 2 +) ions were incorporated into the HT support to moderate the reduction power of the catalyst avoiding the formation of azo- and aniline compounds. Very high azoxy-compound selectivity was achieved under green mild conditions. The photocatalytic activity strongly depends on the incident light wavelength and intensity, and we can further enhance the catalytic efficiency of this photocatalytic process by slight increase in reaction temperature (e.g. 10–20 °C). Moreover, high stability and recyclability of the catalyst were also observed under the investigated conditions. A plausible reaction mechanism was proposed based on the experimental results and literatures. The introduction of both phosphate and metal ions into HT support can prevent the further reduction of azoxy-compounds to azo-compounds or anilines and achieve excellent selectivity to azoxy-compounds. This study reveals that we may engineer a product chemoselectivity by tailoring the supporting materials, and may present a new strategy towards the development of versatile heterogeneous photocatalysts.
TL;DR: In this paper, a thermodynamic model has been developed to investigate the reduction of a nickeliferous limonitic laterite by hydrogen, and the nickel recovery to the ferronickel phase was predicted to be greater than 95% at temperatures of 673-873 K.
Abstract: Abstract Nickeliferous limonitic laterite ores are becoming increasingly attractive as a source of metallic nickel as the costs associated with recovering nickel from the sulphide ores increase. Unlike the sulphide ores, however, the laterite ores are not amenable to concentration by conventional mineral processing techniques such as froth flotation. One potential concentrating method would be the pyrometallurgical solid state reduction of the nickeliferous limonitic ores at relatively low temperatures, followed by beneficiation via magnetic separation. A number of reductants can be utilized in the reduction step, and in this research, a thermodynamic model has been developed to investigate the reduction of a nickeliferous limonitic laterite by hydrogen. The nickel recovery to the ferronickel phase was predicted to be greater than 95 % at temperatures of 673–873 K. Reductant additions above the stoichiometric requirement resulted in high recoveries over a wider temperature range, but the nickel grade of the ferronickel decreased.
Patent•
11 Aug 2017
TL;DR: In this article, an iron and cerium modified beta molecular sieve selective reduction catalyst is described, which is mainly used in a tail gas treatment system for treating gas containing NOx and has good hydrothermal stability.
Abstract: The invention discloses an iron and cerium modified beta molecular sieve selective reduction catalyst as well as a preparation method and an application thereof. Beta zeolite molecular sieves which have low silica-alumina ratio and are synthesized by the aid of a template-free agent are taken as catalyst matrix components, and Fe and Ce ions are introduced in a liquid-state ion exchange and impregnation manner, wherein on the basis of the total weight of the powdery catalyst modified through ion exchange and impregnation, the weight percentage of Fe elements is 0.5%-8.0%, and the weight percentage of Ce elements is 0.5%-6.0%; the silica-alumina ratio (the malar ratio of nSiO2/nAl2O3) of the beta zeolite molecular sieves ranges from 7.8 to 20. The iron and cerium co-modified beta molecular sieve selective reduction catalyst is mainly used in a tail gas treatment system for treating gas containing NOx and has excellent selective reduction capability within the low-temperature range and good hydrothermal stability.
TL;DR: An InCl3-catalyzed selective reduction of a nitroarene bearing an aliphatic ester, ethyl 2-(4-nitrophenyl)propionate, using (EtO)3SiH was achieved to form the corresponding aromatic amine.
Abstract: An InCl3-catalyzed selective reduction of a nitroarene bearing an aliphatic ester, ethyl 2-(4-nitrophenyl)propionate, using (EtO)3SiH was achieved to form the corresponding aromatic amine. The reduction product, aniline derivative, was a good precursor for reductive annulation of 2-carboxybenzaldehyde, which then led to the construction of an isoindolinone skeleton by exactly the same reduction system. Based on these results, a one-pot application via the InCl3/(EtO)3SiH-based catalytic reductive conversion of ethyl 2-(4-nitrophenyl)propionate amounted to a “reductive–reductive annulation,” which finally produced an ester of indoprofen in a high yield.
TL;DR: In this article, the authors used the Ag-RANEY® nickel catalyst for efficient and selective reduction of aromatic nitro compounds, and nitrofurazone as a non-aromatic example, in aqueous solution by using NaBH4 as reducing agent.
Abstract: RANEY® nickel reduced Ag+ ions to form ultrafine spherical silver nanoparticles over itself, and the obtained hybrid material was used as catalyst for efficient and selective reduction of aromatic nitro compounds, and nitrofurazone as a non-aromatic example, in aqueous solution by using NaBH4 as reducing agent. Other silver nanostructures with different morphologies such as silver nano-flowers were also prepared and their efficiency in the reduction process was evaluated. Ag–RANEY® nickel catalyst however, had superior advantages including mild reaction conditions, higher conversion yield, and reduction in aqueous solution at near ambient temperature. The catalyst was also recoverable and showed 5% decrease in efficiency after six successive runs.
TL;DR: Park et al. as mentioned in this paper proposed a method to solve the problem of environmental degradation in the Konkuk University of South Korea, where they studied the effects of environmental pollution on civil and environmental systems.
Abstract: aDepartment of Civil and Environmental System Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea, emails: kypark@konkuk.ac.kr (K.Y. Park), hychakr@gmail.com (H.Y. Cha) bDepartment of Environmental Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea, Tel. +82-2-450-3904, 82-2-450-3736; emails: bsj1003@konkuk.ac.kr (S. Bae), jhkweon@konkuk.ac.kr (J.H. Kweon) cDepartment of Energy and Environmental Engineering, Shinhan University, 40 Bulmadel-ro, Dongducheon-si, Gyeonggi-do 11340, Korea, email: cospea@hanmail.net
Patent•
28 Sep 2017
TL;DR: In this paper, an exhaust purification system consisting of a storage reduction type NOx catalyst and/or a three-way SCR catalyst is proposed. But the SCR is not suitable for high temperature environments.
Abstract: PROBLEM TO BE SOLVED: To provide an SCR catalyst which has an enhanced NOx purification performance under high temperature environment.SOLUTION: An exhaust purification system comprising an exhaust purification catalyst, which is a storage reduction type NOx catalyst and/or a three-way catalyst, and a selective reduction type NOx, in which the selective reduction type NOx contains zeolite relevant to SSZ-13 which carries Cu. When a Cu-carrying amount (Cu conversion, wt.%) in zeolite which carries Cu is represented by X and SiO/AlO(mol.%) in said zeolite is represented by Y, X and Y satisfy specific conditions.SELECTED DRAWING: Figure 3
Patent•
26 Apr 2017
TL;DR: In this paper, a low-temperature V-W-TiO2-based selective reduction catalyst was proposed for low-pressure NOx purification in diesel exhaust gas.
Abstract: The invention discloses a preparation method for a low-temperature V-W-TiO2 based selective reduction catalyst. The method comprises the following steps of weighing ammonium metatungstate, ammonium metavanadate, cerous nitrate, oxalic acid powder, zirconium acetate and de-ionized water; performing kneading, drying, grinding and roasting to obtain V-Ce-Zr-W-TiO2 powder; mixing the V-Ce-Zr-W-TiO2 powder, silica sol and the de-ionized water; performing ball-milling, dipping and drying; and finally performing roasting to obtain the catalyst. According to the method, the addition of the cerous nitrate facilitates the dispersion of WO3 and improves the oxygen storage capacity of the catalyst; the addition of the zirconium acetate improves the effect of CeO2; and the synergistic effect of CeO2-ZrO2 and WO3 can facilitate the dispersity of V2O5 on the surface of TiO2, so that the prepared V-W-TiO2 based selective reduction catalyst has the advantages that the low-temperature activity is good, the initiation temperature is lower than 190 DEG C, and the like, and is especially suitable for purification of NOx in diesel exhaust gas.
Patent•
04 Jul 2017
TL;DR: In this article, a procedure for the selective reduction of nitrogen oxides (nox) to nitrogen in the presence of oxygen using hydrogen as a reducing agent, as well as an active and selective catalyst based on platinum (pt) supported on silica- amorphous alumina.
Abstract: Procedure for the selective reduction of nitrogen oxides (nox) to nitrogen in the presence of oxygen using hydrogen as a reducing agent, as well as an active and selective catalyst based on platinum (pt) supported on silica- amorphous alumina. This procedure allows the elimination of nitrogen oxides from combustion emissions from fixed and mobile sources, especially from diesel engines. (Machine-translation by Google Translate, not legally binding)
Patent•
18 Jan 2017
TL;DR: In this article, a method for preparing an electrocatalyst for selective reduction of carbon dioxide, comprising the steps of dissolving a metal precursor in an organic solvent, and then performing the metal precursor with a first heat treatment to prepare a metal precursors solution, dispersing a carbon support in a mixed solution of a fixing agent and the organic solvent by ultrasonic waves, adding the carbon support solution into the metal precursor solution and performing a second heat treatment for 1 to 3 hours, thereby improving the Faraday efficiency and showing lower over-potential in the selective reduction from CO
Abstract: The present invention relates to a method for preparing an electrocatalyst for selective reduction of carbon dioxide, comprising the steps of: (A) dissolving a metal precursor in an organic solvent and then performing the metal precursor with a first heat treatment to prepare a metal precursor solution; (B) dispersing a carbon support in a mixed solution of a fixing agent and the organic solvent by ultrasonic waves to prepare a carbon support solution; (C) adding the carbon support solution into the metal precursor solution and performing a second heat treatment for 1 to 3 hours, thereby improving the Faraday efficiency and showing lower over-potential in the selective reduction from CO_2 to CO.
TL;DR: In this paper, the reduction of allenyl(diphenyl)phosphine oxides with HSiCl3 or LiAlH4 selectively afforded the corresponding allyl-phosphines oxides, and they gave a mixture of 4,4-dimethyl-1-phenyl-1,2,3,4,5-tetrahydro-λ5phosphinoline 1-oxide.
Abstract: The reduction of allenyl(diphenyl)phosphine oxides with HSiCl3 or LiAlH4 selectively afforded the corresponding allyl(diphenyl)phosphine oxides. 3-Methylbut-2-en-1-yl(diphenyl)phosphine oxide reacted with AlCl3 to give a mixture of 4,4-dimethyl-1-phenyl-1,2,3,4-tetrahydro-λ5-phosphinoline 1-oxide and 4,4-dimethyl-1-phenyl-1,4-dihydro-λ5-phosphinoline 1-oxide.
Patent•
24 Aug 2017
TL;DR: In this paper, the authors proposed a catalyst for exhaust purification that has improved NO selective reduction ability at low temperature and offers an improved NOpurification rate, where a CeOparticle is placed on the surface of an Mn Oparticle and a Ce content relative to the total content of Mn and Ce (Ce/(Mn+Ce)) is more than 0 mol% and 40 mol% or less.
Abstract: PROBLEM TO BE SOLVED: To provide a catalyst that has an improved NO selective reduction ability at low temperature and offers an improved NOpurification rate.SOLUTION: A catalyst for exhaust purification carries a CeOparticle on the surface of an MnOparticle. In the catalyst, a Ce content relative to a total content of Mn and Ce (Ce/(Mn+Ce)) is more than 0 mol% and 40 mol% or less.SELECTED DRAWING: None
Patent•
08 Jun 2017
TL;DR: In this article, the authors provided a catalyst for selective reduction type exhaust gas purification having bivalent iron carried in a pore of a chabazite (CHA) type zeolite carrier.
Abstract: PROBLEM TO BE SOLVED: To provide a catalyst for selective reduction type exhaust gas purification high in selectivity to a reaction for reducing NOx by NHeven in a high temperature range and having high heat resistance.SOLUTION: There is provided a catalyst for selective reduction type exhaust gas purification having bivalent iron carried in a pore of a chabazite (CHA) type zeolite carrier and carrying concentration of the bivalent iron ion based on total of the carrier and the bivalent iron ion in terms of metal of 5.0 to 10.0 wt.%. Silico alumino phosphate such as SAPO-34 or the like, alumino silicate such as SSZ-13 or a mixture thereof is preferably used as a chabazite type zeolite and SAPO-34 is preferably from a view point of heat resistance.SELECTED DRAWING: Figure 9