Mechanistic investigation of the enhanced NH3-SCR on cobalt-decorated Ce-Ti mixed oxide: In situ FTIR analysis for structure-activity correlation
dc.contributor.author | Liu, Jie | |
dc.contributor.author | Li, Xin Yong | |
dc.contributor.author | Zhao, Q. | |
dc.contributor.author | Ke, Jun | |
dc.contributor.author | Xiao, H. | |
dc.contributor.author | Lv, X. | |
dc.contributor.author | Liu, Shaomin | |
dc.contributor.author | Tadé, Moses | |
dc.contributor.author | Wang, Shaobin | |
dc.date.accessioned | 2017-01-30T12:05:24Z | |
dc.date.available | 2017-01-30T12:05:24Z | |
dc.date.created | 2016-09-07T19:30:21Z | |
dc.date.issued | 2017 | |
dc.identifier.citation | Liu, J. and Li, X.Y. and Zhao, Q. and Ke, J. and Xiao, H. and Lv, X. and Liu, S. et al. 2017. Mechanistic investigation of the enhanced NH3-SCR on cobalt-decorated Ce-Ti mixed oxide: In situ FTIR analysis for structure-activity correlation. Applied Catalysis B: Environmental. 200: pp. 297-308. | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/18001 | |
dc.identifier.doi | 10.1016/j.apcatb.2016.07.020 | |
dc.description.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 NOx by NH3 (NH3-SCR) reaction, by adjusting the ratio of surface Ce3+ 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 Co2+ and Ce4+, the lattice distortion of Ce-Ti mixed oxide was greatly aggravated and subsequently increased the ratio of Ce3+ and the surface adsorbed oxygen, which benefited the generation of adsorbed NOx 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 NH3 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 NH3 species and NO molecules. The enhancements in both the reactions from L-H and E-R mechanisms appeared to directly correlated with the improved deNOx 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. | |
dc.publisher | Elsevier BV | |
dc.relation.sponsoredby | http://purl.org/au-research/grants/arc/DP150103026 | |
dc.title | Mechanistic investigation of the enhanced NH3-SCR on cobalt-decorated Ce-Ti mixed oxide: In situ FTIR analysis for structure-activity correlation | |
dc.type | Journal Article | |
dcterms.source.volume | 200 | |
dcterms.source.startPage | 297 | |
dcterms.source.endPage | 308 | |
dcterms.source.issn | 0926-3373 | |
dcterms.source.title | Applied Catalysis B: Environmental | |
curtin.department | Department of Chemical Engineering | |
curtin.accessStatus | Fulltext not available |
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