The tuned selective catalytic reduction behaviors of NO over the Pt/CeO2 catalysts by preferentially exposing different facets of CeO2 supports

• Published in: Catalysis communications Vol. 172; p. 106530
• Main Authors: Wang, Kaiqiang, Zhang, Roujia, Wu, Songze, Chen, Mengyin, Tang, Jie, Zhao, Liming, Liu, Yubing, Fan, Yining
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2022; Elsevier
• Subjects: CeO2 support; Different exposed facet; NO + CO reaction; Oxygen vacancy; Pt catalyst; Different exposed facet; Pt catalyst; CeO2 support; NO + CO reaction; Oxygen vacancy
• ISSN: 1566-7367; 1873-3905
• DOI: 10.1016/j.catcom.2022.106530

For the Pt catalysts supported on CeO2 nanosheet (NS), nanopolyhedron (NP) and nanorod (NR) with preferentially exposed {100}, {111} and {110} facets, respectively, the NO conversion and N2 selectivity for NO + CO reaction at 100–250 °C exhibit the order as Pt/CeO2-NS{100} > Pt/CeO2-NP{111} > Pt/CeO2-NR{110}. The higher surface concentration of oxygen vacancies on CeO2 (NS) can promote the dissociation of NO and result in the highest performance of Pt/CeO2-NS{100} catalyst. Moreover, CO intensively chemisorbs on the Pt2+ ions on CeO2 (NR) support, suppressing the dissociative chemisorption of NO and leading to lower reaction performance of Pt/CeO2-NR{110} catalyst. [Display omitted] •The facet–dependent effect of Pt/CeO2 catalysts for NO + CO reaction has been studied.•The higher O2− vacancy concentration on Pt/CeO2-NS{100} catalyst promotes NO dissociation.•The more negatively charged O2− on CeO2{110} results in stronger CO adsorption on Pt2+.