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
In situ IR studies of Co and Ce doped Mn/TiO 2 catalyst for low-temperature selective catalytic reduction of NO with NH 3
TL;DR: In this article, the authors investigated the adsorption and co-adsorption of NH 3, NO and O 2 on catalysts by in situ FTIR spectroscopy and found that the presence of cobalt and cerium oxides increased the number of acid and redox sites.
Journal ArticleDOI
Stability of luminescent trivalent cerium in silica host glasses modified by boron and phosphorus
Carmen Canevali,M. Mattoni,Franca Morazzoni,Roberto Scotti,Mariano Casu,Anna Musinu,Radenka Krsmanović,Stefano Polizzi,A. Speghini,Marco Bettinelli +9 more
TL;DR: The homogeneous rare-earth dispersion in the host matrix and the stabilization of the Ce(3+) oxidation state enhanced the intensity of the photoluminescence emission in PSG and BPSG with respect to BSG and SG.
Journal ArticleDOI
Design Strategies for CeO2-MoO3 Catalysts for DeNOx and Hg(0) Oxidation in the Presence of HCl: The Significance of the Surface Acid-Base Properties.
TL;DR: The characterization and balance of basicity and acidity of an SCR catalyst is believed to be helpful in preventing deactivation by acid gas in the SCR reaction and simultaneous Hg(0) oxidation.
Journal ArticleDOI
Structural, Morphological, and Oxygen Handling Properties of Nanosized Cerium−Terbium Mixed Oxides Prepared by Microemulsion
Ana B. Hungría,Arturo Martínez-Arias,Marcos Fernández-García,Ana Iglesias-Juez,Antonio Guerrero-Ruiz,José J. Calvino,and J. C. Conesa,J. Soria +7 more
TL;DR: The structural/morphological and oxygen handling properties of two high-surface-area Ce−Tb mixed oxides prepared by a microemulsion method with Ce/Tb atomic ratios of ca. 4 and 1 have been analyzed in this article.
Journal ArticleDOI
Adsorption and oxidation of NH3 over V2O5/AC surface
TL;DR: In this paper, the adsorption and oxidation of NH3 over V2O5/AC were studied using TG, MS and DRIFTS techniques, and it was found that NH3 adsoration and oxidation take place mainly at the V O bond of V 2O5.
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