Journal ArticleDOI
Mechanistic investigation of the enhanced NH3-SCR on cobalt-decorated Ce-Ti mixed oxide: In situ FTIR analysis for structure-activity correlation
Jie Liu,Jie Liu,Xinyong Li,Qidong Zhao,Jun Ke,Huining Xiao,Xiaojuan Lv,Shaomin Liu,Moses O. Tadé,Shaobin Wang +9 more
TLDR
In this article, a series of transition metals (Co, Cu and Fe) were selected to decorate Ce-Ti mixed oxide to elevate the low-temperature activity of selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) reaction.Abstract:
A series of transition metals (Co, Cu and Fe) were selected to decorate Ce-Ti mixed oxide to elevate the low-temperature activity of selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) reaction, by adjusting the ratio of surface Ce 3+ species and oxygen vacancies. Among them, Co-Ce-Ti sample exhibited the excellent low-temperature activity and broadened temperature window, which could be attributed to the improvement of the physico-chemical properties and the acceleration of the reactions in the Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) mechanisms. Owing to the different ionic sizes of Co 2+ and Ce 4+ , the lattice distortion of Ce-Ti mixed oxide was greatly aggravated and subsequently increased the ratio of Ce 3+ and the surface adsorbed oxygen, which benefited the generation of adsorbed NO x species and improved the reaction in the L-H mechanism. Meanwhile, the coordinatively unsaturated cationic sites over the Co-Ce-Ti sample induced more Lewis acid sites and enhanced the formation of the adsorbed NH 3 species bounded with Lewis acid sites, which were considered as the crucial intermediates in E-R mechanism, and therefore facilitating the reaction between the adsorbed NH 3 species and NO molecules. The enhancements in both the reactions from L-H and E-R mechanisms appeared to directly correlated with the improved deNO x performance on the Co-Ce-Ti sample, and the L-H mechanism could be the dominate one at low temperatures due to its rapid reaction rate.read more
Citations
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Journal ArticleDOI
Selective Catalytic Reduction of NOx with NH3 by Using Novel Catalysts: State of the Art and Future Prospects.
Lupeng Han,Sixiang Cai,Sixiang Cai,Min Gao,Jun-ya Hasegawa,Penglu Wang,Jianping Zhang,Liyi Shi,Dengsong Zhang +8 more
TL;DR: This review summarizes the latest SCR reaction mechanisms and emerging poison-resistant mechanisms in the beginning and subsequently gives a comprehensive overview of newly developed SCR catalysts, including metal oxide catalysts ranging from VOx, MnOx, CeO2, and Fe2O3 to CuO based catalysts.
Journal ArticleDOI
Improved activity and significant SO2 tolerance of samarium modified CeO2-TiO2 catalyst for NO selective catalytic reduction with NH3
Hao Liu,Hao Liu,Zhongxuan Fan,Chuanzhi Sun,Chuanzhi Sun,Shuohan Yu,Shuai Feng,Wei Chen,Dezhan Chen,Changjin Tang,Fei Gao,Lin Dong +11 more
TL;DR: In this paper, a samarium-doped CeO2-TiO2 mixed oxide (CeTi-O2) catalyst was synthesized for the NH3-SCR reaction.
Journal ArticleDOI
Co3O4 quantum dots/TiO2 nanobelt hybrids for highly efficient photocatalytic overall water splitting
TL;DR: In this article, the Co3O4 quantum dots (QDs)/TiO2 nanobelts (NBs) hybrid was constructed via a facile hydrothermal method for simultaneous H2 and O2 productions from pure water, with high evolution rates of 41.8 and 22.0
Journal ArticleDOI
A Review of Low Temperature NH3-SCR for Removal of NOx
TL;DR: In this paper, the authors reviewed the recent research progress on supported transition and mixed transition metal oxide catalysts for the LT-SCR reaction and discussed the influence of operating conditions and promoters on the performance.
Journal ArticleDOI
CuInS 2 quantum dots embedded in Bi 2 WO 6 nanoflowers for enhanced visible light photocatalytic removal of contaminants
TL;DR: In this article, a novel CuInS2 quantum dots (CIS-QDs)/Bi2WO6 3D composites were successfully synthesized through facile deposition process, followed by low temperature calcination.
References
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Journal ArticleDOI
Mechanism of the Selective Catalytic Oxidation of Slip Ammonia over Ru-Modified Ce–Zr Complexes Determined by in Situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy
TL;DR: To achieve selective catalytic oxidation (SCO) of slip ammonia, Ru-modified Ce-Zr solid solution catalysts were prepared and evaluated under various conditions and the results showed that NH3 oxidation follows an internal SCR (iSCR) mechanism.
Journal ArticleDOI
Effect of H2O and SO2 on the Selective Catalytic Reduction of NO with NH3 Over Ce/TiO2 Catalyst: Mechanism and Kinetic Study
TL;DR: In this paper, the mechanism of H2O and SO2 effect on NO reduction over Ce/TiO2 was studied using the steady state kinetic study and the reaction kinetic parameters were compared.
Journal ArticleDOI
A novel CuTi-containing catalyst derived from hydrotalcite-like compounds for selective catalytic reduction of NO with C3H6 under lean-burn conditions
TL;DR: A series of hydrotalcite-based Cu x Ti 1 (x = 2, 3, 4, 5)-mixed oxide catalysts have been synthesized by homogeneous precipitation and tested in the selective catalytic reduction (SCR) of NO by C 3 H 6 in the presence of excess oxygen as discussed by the authors.
Journal ArticleDOI
Supercritical water syntheses of CexTiO2 nano-catalysts with a strong metal-support interaction for selective catalytic reduction of NO with NH3
TL;DR: In this paper, the feasibility of a supercritical water synthesis route (referred as CHFS) in the application of selective catalytic reduction (SCR) of NO with NH3 was reported.
Journal ArticleDOI
NO SCR with propane and propene on Co-based alumina catalysts prepared by co-precipitation
Fuxiang Zhang,Shujuan Zhang,Shujuan Zhang,Naijia Guan,E. Schreier,Manfred Richter,Reinhard Eckelt,Rolf Fricke +7 more
TL;DR: In this article, the co-precipitation method was used to achieve homogeneous dispersions and small size of deposited high-content cobalt on alumina, and the results showed that the Co loading, calcination temperatures and the type of additive metals were well maintained on the cobalt-based binary alumina catalysts with Zn, Ag, Fe, Cu or Ni as modifiers.
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