Efficient oxidation of o-xylene over CeO2 catalyst prepared from a Ce-MOF template: The promotion of K+ embedding substitution

• Published in: Molecular catalysis Vol. 436; pp. 120 - 127
• Main Authors: Wang, Hao, Liu, Ming, Guo, Shihao, Wang, Yafei, Han, Xue, Bai, Yunyu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.07.2017
• Subjects: Catalytic oxidation; Cerium oxide; MOFs; o-xylene; Catalytic oxidation; o-xylene; MOFs; K; Cerium oxide
• ISSN: 2468-8231; 2468-8231
• DOI: 10.1016/j.mcat.2017.04.017

[Display omitted] K doping results in more active oxygen species, stronger oxygen absorption capacity and oxygen storage capacity of CeO2. •K doping of CeO2-M was prepared by a Ce-MOF template method.•CeO2-M shows much better activity than CeO2-P for o-xylene oxidation.•K doping results in more active oxygen species, stronger oxygen absorption capacity and oxygen storage capacity.•Morphology, active oxygen, oxygen absorption capacity and oxygen storage capacity are contributed to high activity.•MOF template method is useful for preparing highly efficient metal oxide catalyst. CeO2-M was prepared by a Ce-MOF-template method and characterized using SEM, XRD, XPS, Raman, TEM, BET and O2-TPD. The SEM images and pore size distribution data showed that CeO2-M had a porous structure. The XRD, XPS, Raman and TEM results confirmed the appearance of K+ embedding substitution. The XPS and TPD data confirmed that much more active oxygen species and stronger adsorption oxygen capacity of CeO2-M. The OSC tests showed CeO2-M had a stronger oxygen storage capacity. The solid catalyst was evaluated for o-xylene oxidation at low temperature. CeO2-M had high catalytic performance, nearly 100% o-xylene conversion achieved at a GHSV of 120,000h−1 and o-xylene inlet concentration of 200ppm at 210°C, which was much better than that of CeO2-P and K/CeO2-P. The high catalytic performance is attributed to honeycomb texture, active oxygen species, strong oxygen adsorption capacity and strong oxygen storage capacity.