期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 208, 期 -, 页码 82-93出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2017.02.060
关键词
Ceria-based catalysts; TiO2; Crystal form; Interaction; NH3-SCR reaction
资金
- National Natural Science Foundation of China [21507130]
- Chongqing Science & Technology Commission [cstc2016jcyjA0070, cstc2014pt-gc20002, cstc2014yykfC20003, cstcicjcxljrc13]
- Open Project Program of Jiangsu Key Laboratory of Vehicle Emissions Control [OVEC001, OVEC007]
- Open Project Program of Chongqing Key Laboratory of Catalysis and Functional Organic Molecules from Chongqing Technology and Business University [1456029]
Anatase (A) TiO2 is widely used as a support of the supported vanadium-based and non-vanadium-based catalysts for NH3-SCR reaction. However, there is lack of enough attention for brookite (B) and rutile (R) TiO2. Therefore, in the present work, we synthesize a series of TiO2-A, TiO2-B, and TiO2-R, and then used as supports to prepare CeO2/TiO2-A, CeO2/TiO2-B, and CeO2/TiO2-R catalysts with the purpose of clarifying the crystal form effect of TiO2 supports on the physicochemical properties and catalytic performance of these supported ceria-based catalysts for NH3-SCR reaction. Characterization results exhibit that H-2 consumption (responding to reduction property), acid amounts, surface Ce3+ content, surface adsorbed oxygen species, and catalytic performance of these supported ceria-based catalysts give the order of CeO2/TiO2-R>CeO2/TiO2-B > CeO2/TiO2-A, which is related to the interaction (i.e., Ce3+ Ti4+<-> Ce4+Ti3+) between CeO2 and TiO2 (anatase, brookite, and rutile). Especially, CeO2/1102-R catalyst exhibits the optimal catalytic performance for NH3-SCR reaction among these supported ceria-based catalysts owing to the most excellent reduction property as well as the largest amounts of acid sites, surface Ce3+ content, and surface adsorbed oxygen species. (C) 2017 Elsevier B.V. All rights reserved.
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