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Morphology and crystal-plane dependence of CeO2-TiO2 catalysts: Activity and mechanism for the selective catalytic reduction of NOx with NH3
Luo, Wen1,2,3,4; Rong, Jing; Zhao, Wanxia1,2; Kang, Keke; Long, Lulu; Yao, Xiaojiang5
2022-09-15
摘要CeO2-TiO2 catalysts with four different morphologies were successfully synthesized by a hydrothermal method and tested for selective catalytic reduction of NOx with NH3 (NH3-SCR). For the four catalysts, CeO2-TiO2 nanocubes (CT-NC) and nanorods (CT-NR) preferentially exposed {1 0 0} and {1 1 0} facets, respectively; furthermore, nanosheets (CT-NS) and nanospheres (CT-NH) mainly exposed {111} facet. Interestingly, CT-NH catalyst showed the best NH3-SCR performance and the NOx conversion exceeded 97% at 325 degrees C. Through a series of characteristic methods manifested that the short-range ordered structure of Ce-O-Ti in CT-NH catalyst provided stronger surface acidic sites to promote the high-temperature activity. Moreover, the abundant Ce3+ species and appropriate reduction ability on {111} facet of CT-NH catalyst also caused outstanding deNOx activity. Reaction mechanism study showed that the Langmuir-Hinshelwood (L-H) mechanism and Eley-Rideal (E-R) mechanism existed simultaneously on all catalysts in NH3-SCR reaction. Meaningfully, two types of E-R mechanism were present on CT-NH catalyst, while L-H mechanism was dominant.
关键词NH3-SCR reaction Morphology Crystal-plane CeO2-TiO2 catalysts Reaction mechanism
DOI10.1016/j.cej.2022.136488
发表期刊CHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
卷号444页码:16
通讯作者Yao, Xiaojiang(yaoxj@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000800389500003
语种英语