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
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Activity and characterization of Ce–Mo–Ti mixed oxide catalysts prepared by a homogeneous precipitation method for selective catalytic reduction of NO with NH3
Ye Jiang,Xing Zhang,Mingyuan Lu,Changzhong Bao,Guitao Liang,Chengzhen Lai,Weiyun Shi,Shiyuan Ma +7 more
TL;DR: In this paper, a series of CeMo-Ti mixed oxide catalysts were evaluated for selective catalytic reduction (SCR) of NO with NH3, and the experimental results indicated that the optimal CeMo−Ti oxide catalyst (Ce40Mo10Ti) exhibited excellent SCR activity in a wide temperature range of 250-450 °C as well as strong resistance to high gas hourly space velocity, 10% H2O or//and 1000 ppm SO2.
Journal ArticleDOI
Synthesis of CrOx/C catalysts for low temperature NH3-SCR with enhanced regeneration ability in the presence of SO2
Shuohan Yu,Sheng Xu,Bowen Sun,Yiyang Lu,Lulu Li,Weixin Zou,Peng Wang,Fei Gao,Changjin Tang,Lin Dong +9 more
TL;DR: In this article, the NH3-SCR was used for selective catalytic reduction of NOx by amorphous carbon nano-particles with an average diameter of 3 nm.
Journal ArticleDOI
One-pot synthesis of Cu–Ce co-doped SAPO-5/34 hybrid crystal structure catalysts for NH3-SCR reaction with SO2 resistance
TL;DR: In this paper, a one-pot hydrothermal method was used to synthesize SAPO-5/34-based catalysts doped with Cu, Ce as active components, and their catalytic activities were measured for selective catalytic reduction (SCR) of NO with NH3.
Journal ArticleDOI
Preparation and Performance of Cerium-Based Catalysts for Selective Catalytic Reduction of Nitrogen Oxides: A Critical Review
TL;DR: In this article, a review of cerium-based catalysts for selective catalytic reduction of nitrogen oxides with NH3 (NH3-SCR) is presented, which is the most commonly used control technology for NOx emission.
Journal ArticleDOI
Experimental and Density Functional Theory Studies on the Zeolite-Based Fe–Ni–W Trimetallic Catalyst for High-Temperature NOx Selective Catalytic Reduction: Identification of Active Sites Suppressing Ammonia Over-oxidation
TL;DR: The selective catalytic reduction (SCR) of NOx with NH3 at high temperature (T > 500 °C) usually has low conversion efficiency due to the undesired NH3 over-oxidation as discussed by the authors.
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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