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Title: Preparation of Ce x Zr1-x O2 by Different Methods and Its Catalytic Oxidation Activity for Diesel Soot. Author: Chen W, Fan L, Jiang X, Guo J, Liu H, Tian M. Journal: ACS Omega; 2022 May 17; 7(19):16352-16360. PubMed ID: 35601292. Abstract: Novel Ce x Zr1-x O2 (x = 0.67, 0.8, 0.9, 1.0) catalysts were designed and synthesized by solvothermal, calcination, and sol-gel methods and were used to catalyze oxidation of soot from diesel vehicle exhaust. The influence of catalysts synthesized by different methods and Ce/Zr molar ratios on the performance was investigated. These catalysts were characterized by XRD, N2 adsorption-desorption, FT-IR, TEM, XPS, H2-temperature programmed reduction (TPR), and O2-temperature programmed desorption (TPD) techniques. The results indicated that Ce0.8Zr0.2O2 prepared by the calcination method has excellent activity and stability at low temperature. The soot ignition point is 322 °C, and the ratio of soot conversion reaches 90% at 497 °C, which is lower than that from the solvothermal and sol-gel methods. The XRD, Raman, SEM, XPS and H2-TPR results reveal that the structure and oxygen adsorption properties are crucial to soot oxidation activity, and Zr4+ is successfully doped into the CeO2 lattice and forms a homogeneous solid solution. Nanostructured Ce0.8Zr0.2O2 with 110.2 m2/g surface areas is produced. The proportion of chemical oxygen and surface adsorbed oxygen in the catalyst prepared from the calcination method is the highest at 23.18%. The structure may lead to charge imbalance, unsaturated bonds, and oxygen vacancies, thus increasing the adsorption of oxygen on the catalyst surface.[Abstract] [Full Text] [Related] [New Search]