Fabrication of Spinel-Type PdxCo3–xO4 Binary Active Sites on 3D Ordered Meso-macroporous Ce-Zr-O2 with Enhanced Activity for Catalytic Soot Oxidation

• DOI: 10.1021/acscatal.8b01924
• Publication Date: 2018-07-18T13:31:08Z
• Authors: Jing Xiong; Qiangqiang Wu; Xuelei Mei; Jian Liu; Yuechang Wei; Zhen Zhao; Dan Wu; Jianmei Li
• Keywords: 01 natural sciences; 0104 chemical sciences

3D ordered meso-macroporous (3DOMM) Ce0.2Zr0.8O2 (CZO) was successfully synthesized by a combined method of evaporation-induced interfacial self-assembly (EISA) and colloidal crystal templates (CCT). The multifunctional catalysts of spinel-type PdxCo3–xO4 nanoparticles (NPs) supported on 3DOMM CZO were fabricated by a gas bubbling assisted coprecipitation (GBCP) method. The relationship between nanostructure (hierarchical pore and spinel-type active phase) and activity during catalytic soot oxidation was studied by the techniques of SEM, TEM, XPS, H2-TPR, NO oxidation, soot-TPO, and so on. The 3DOMM structure with a larger surface area and total pore volume increases the amount of supported active sites and enhances the contact efficiency between reactants (soot, O2, and NO) and catalysts. Spinel-type PdxCo3–xO4 (AB2O4) binary active sites by substitution for Co2+ (A site) with Pd2+ cations are beneficial for improving activation efficiency for gaseous reactants (NO and O2). The novel nanocatalysts of 3DO...