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
More filters
Journal ArticleDOI
Metal organic frameworks-assisted fabrication of CuO/Cu2O for enhanced selective catalytic reduction of NOx by NH3 at low temperatures.
TL;DR: Systematical in situ DRIFT characterization revealed that the NH3-SCR of NOx over CuO/Cu2O heterostructure followed E-R mechanism, which was greatly improved by the abundant Lewis acid sites, improved O2 adsorption and the synergistic effect between Cu+ and Cu2+.
Journal ArticleDOI
Preparation of three-dimensionally ordered macroporous MFe2O4 (M = Co, Ni, Cu) spinel catalyst and its simultaneous catalytic application in CO oxidation and NO + CO reaction
Hao Liu,Liuhui Liu,Longqing Wei,Bingxian Chu,Zuzeng Qin,Guangzhou Jin,Zhangfa Tong,Lihui Dong,Bin Li +8 more
TL;DR: A series of 3D ordered macroporous (3DOM) MFe2O4 spinel catalysts were synthesized for CO oxidation and selective catalytic reduction of NOx by CO as mentioned in this paper.
Journal ArticleDOI
Gas phase sulfation of ceria-zirconia solid solutions for generating highly efficient and SO2 resistant NH3-SCR catalysts for NO removal.
Wei Tan,Jiaming Wang,Lulu Li,Annai Liu,Ge Song,Kai Guo,Yidan Luo,Fudong Liu,Fei Gao,Lin Dong +9 more
TL;DR: This work proved that sulfation treatment could be used in designing an efficient cerium-zirconium based NH3-SCR catalyst with great application prospect.
Journal ArticleDOI
Sn-doped rutile TiO2 for vanadyl catalysts: Improvements on activity and stability in SCR reaction
Wenzhe Si,Wenzhe Si,Liu Haiyan,Tao Yan,Hui Wang,Chi Fan,Shangchao Xiong,Ziqi Zhao,Yue Peng,Jianjun Chen,Junhua Li +10 more
TL;DR: In this article, the V2O5/Sn0.2Ti0.8O2 was designed and synthesized by incipient wetness impregnation, and the results showed that Sn doping improved the redox property, NH3/NO adsorption and the amount of surface chemisorbed oxygen.
Journal ArticleDOI
Understanding Zn Functions on Hydrothermal Stability in a One-Pot-Synthesized Cu&Zn-SSZ-13 Catalyst for NH3 Selective Catalytic Reduction
TL;DR: In this article, a CHA-type aluminosilicate zeolite has attracted substantial attention recently due to its extraordinary physicochemical properties, and Cu-modified SSZ-13 has been commercialized as a selforganizer.
References
More filters
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.
Journal ArticleDOI
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.
Related Papers (5)
DRIFT Study on Cerium−Tungsten/Titiania Catalyst for Selective Catalytic Reduction of NOx with NH3
Liang Chen,Junhua Li,Maofa Ge +2 more