title: Investigation on the structure-activity relationship of BaO promoting Pd/CeO2-ZrO2catalysts for CO, HC and NOxconversions.
abstract: Four different synthetic routes (co-precipitation, oxidation-precipitation, citric acid sol-gel and reversed microemulsion) are adopted to prepare barium modified Pd/CeO2-ZrO2catalysts and their catalytic activity towards CO, HC and NOxconversions is studied. The surface and bulk properties of these catalysts are characterized via XRD, N2adsorption, XPS, UV-Raman, H2-TPR, and in situ DRIFTS. The catalyst prepared via the co-precipitation method exhibits the optimum three-way catalytic behavior, which is mainly due to its superior redox ability, whereas the oxidation-precipitation synthesis renders the catalyst with the best homogeneity and thermal resistance. However, for the catalyst prepared via the sol-gel route, its worst NOxreduction capacity is verified by the scarce appearance of negatively charged Pd0-N[double bond, length as m-dash]Oδ-species, which is related to the faster dissociation of NO based on in situ DRIFTS, and the abundance of surface CO-Pd+species reveals its unsatisfactory deep oxidizability of the HC reactant.
authors.affiliation: Institution of Catalysis, Zhejiang University, Hangzhou 310028, P. R. China. zhourenxian@zju.edu.cn.
authors.forename: Jiansong
authors.initials: J
authors.lastname: Lin
authors.affiliation: Institution of Catalysis, Zhejiang University, Hangzhou 310028, P. R. China. zhourenxian@zju.edu.cn.
authors.forename: Linyan
authors.initials: L
authors.lastname: Yang
authors.affiliation: Institution of Catalysis, Zhejiang University, Hangzhou 310028, P. R. China. zhourenxian@zju.edu.cn.
authors.forename: Ting
authors.initials: T
authors.lastname: Wang
authors.affiliation: Institution of Catalysis, Zhejiang University, Hangzhou 310028, P. R. China. zhourenxian@zju.edu.cn.
authors.forename: Renxian
authors.identifier: http://orcid.org/0000-0002-0836-2140
authors.initials: R
authors.lastname: Zhou