文献类型：期刊文献

英文题名：Understanding structure-performance relationships of CoOx/CeO2 catalysts for NO catalytic oxidation: Facet tailoring and bimetallic interface designing

作者：Cheng, Xiaomin[1];Liu, Yiqi[1];Yang, Lubin[1];Yang, Mingjie[1];Zhang, Yongzheng[1];Ma, Cheng[1];Meng, Xuan[1];Xu, Jing[2];Wang, Jitong[1];Qiao, Wenming[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Guangxi Univ, Sch Chem & Chem Engn, Guangxi Key Lab Petrochem Resource Proc & Proc Int, Nanning 530004, Peoples R China

年份：2023

卷号：451

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：;EI(收录号：20231313807358);WOS:【SCI-EXPANDED(收录号:WOS:000952000500001)】；

基金：This work is partly supported by the National Natural Science Foundation of China (No. 22178107, No. U21A2060, No. 22178116, No. 21978097) , Shanghai Pujiang Program (No. 21PJD019) , Natural Sci- ence Foundation of Shanghai (No. 22ZR1417400) .

语种：英文

外文关键词：CoOx; CeO2 catalysts; Exposed crystal facet; Bimetallic interaction; NO oxidation

摘要：Crystalline structure and bimetallic interaction of metal oxides are essential factors to determine the catalytic activity. Herein, three different CoOx/CeO2 catalysts, employing CeO2 nanorods (predominately exposed {110 facet), CeO2 nanopolyhedra ({111} facet) and CeO2 nanocubes ({100} facet) as the supports, are successfully prepared for investigating the effect of exposed crystal facets and bimetallic interface interaction on NO oxidation. In comparison with the {111} and {100} facets, the exposed crystal facet {110} exists the best su-periority to anchor and stabilize Co species. Moreover, ultra-small CoOx clusters composed of strong Co-O co-ordination shells with minor Co-O-Ce interaction are formed and uniformly dispersed on the CeO2 nanorods. Structural characterizations reveal that the active exposed crystal facet {110} and the strong bimetallic interface interaction in CoOx/CeO2-nanorods (R-CC) result in more structural defect, endowing it with abundant oxygen vacancies, excellent reducibility and strong adsorption capacity. The DRIFTs spectra further indicate that the exposed crystal facet {110} has a significant promoting effect on the strength of nitrates compared with {111} and {100} facets. The bimetallic interface interaction not only significantly facilitates the formation of nitrate species at lower temperature, but also effectively suppresses the generation of sulfate and lower the sulphation rate. Therefore, R-CC catalyst exhibits the maximum NO oxidation activity with the conversion of 86.4 % at 300 degrees C and still sustains its high activity under cyclic condition or 50 ppm SO2. The provided crystalline structure and interaction-enhanced strategy sheds light on the design of high-activity NO oxidation catalysts.