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
Low-Temperature De-NOx Extruded Monolithic Catalysts Based on Highly Dispersive Mn–Ce Oxide Nanoparticles of Low Ce Content
Journal ArticleDOI
Revealing M (M= Cu, Co and Zr) oxides doping effects on anti-PbCl2 poisoning over Mn-Ce/AC catalysts in low-temperature NH3-SCR reaction
TL;DR: In this paper , the effects of three transition metal oxides (Cu, Co and Zr) on resistance PbCl2 poisoning for the catalyst were investigated, and the results showed that the catalytic reaction pathways of all the poisoned or modified catalysts were in accordance with both Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) mechanisms.
Journal ArticleDOI
Simultaneous catalytic oxidation of CO and Hg0 over Au/TiO2 catalysts: Structure and mechanism study
TL;DR: In this paper, the authors showed that the AuV/TiO2 catalyst with a structure of submicron sphere and ascorbic acid modification showed 38.2% (41.1% without H2O) CO conversion at 50°C and nearly 100% CO conversion in the range of 275-350℃ (225-350 ℃, without H 2O).
Journal ArticleDOI
Poisoning effect of K with respect to Cu/ZSM-5 used for NO reduction
TL;DR: In this paper, the poisoning effect of K with respect to Cu/ZSM-5 in NH3-SCR was established via catalytic testing, and both the poisoning effects of K and Cu were probed by using XRD, N2 sorption, TEM, H2-TPR, XPS, NH3 TPD, and NO-TPD.
Journal ArticleDOI
An environmental and highly active Ce/Fe-Zr-SO42- catalyst for selective catalytic reduction of NO with NH3: The improving effects of CeO2 and SO42-
Chunxiao Yang,Kexin Zhang,Yankun Zhang,Guo jian Peng,Meng Yang,Junjie Wen,Yu Xie,Futing Xia,Lijuan Jia,Qiulin Zhang +9 more
TL;DR: A series of Ce/Fe-Zr-SO42- catalysts have been developed and developed for selective catalytic reduction of NO with ammonia (NH3-SCR) as mentioned in this paper.
References
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Journal ArticleDOI
Semiconductor heterojunction photocatalysts: design, construction, and photocatalytic performances
Huanli Wang,Lisha Zhang,Zhigang Chen,Junqing Hu,Shijie Li,Zhaohui Wang,Jianshe Liu,Xinchen Wang +7 more
TL;DR: This review attempts to summarize the recent progress in the rational design and fabrication ofheterojunction photocatalysts, such as the semiconductor-semiconductor heterojunction, the semiconductors-metal heterojunctions, the silicon-carbon heteroj junction and the multicomponent heteroj conjunction.
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Chemical and mechanistic aspects of the selective catalytic reduction of NOx by ammonia over oxide catalysts: A review
TL;DR: In this paper, the open literature concerning chemical and mechanistic aspects of the selective catalytic reduction of NO by ammonia (SCR process) on metal oxide catalysts is reviewed, and the results of spectroscopic studies of the adsorbed surface species, adsorption-desorption measurements, flow reactor and kinetic experiments are analyzed.
Journal ArticleDOI
Satellite structure in the X-ray photoelectron spectra of some binary and mixed oxides of lanthanum and cerium
TL;DR: In this paper, a study of the core-electron X-ray photoelectron (X-p) spectra of the f0 compounds La2O3, LaMO3(M = Fe and Co), CeO2, and BaCeO3 is described.
Journal ArticleDOI
Titanium-Defected Undoped Anatase TiO2 with p-Type Conductivity, Room-Temperature Ferromagnetism, and Remarkable Photocatalytic Performance
TL;DR: Using anatase TiO2, the most important and widely studied semiconductor, it is demonstrated that metal vacancies (VTi) can be introduced in undoped oxides easily, and the presence of VTi results in many novel physiochemical properties.
Journal ArticleDOI
Nickel-doped Mn/TiO2 as an efficient catalyst for the low-temperature SCR of NO with NH3: Catalytic evaluation and characterizations
TL;DR: In this article, a series of Mn-Ni/TiO 2 catalysts were prepared by adopting incipient wetness technique and investigated for low-temperature SCR of NO with NH 3 in the presence of excess oxygen.
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