Effect of Particle Size and Crystal Surface of CeO on the Catalytic Combustion of Benzene.

In this study, three kinds of CeO were synthesized, and supported PdO (x = 0,1) catalysts were prepared for benzene catalytic combustion. The samples were characterized by XRD, N adsorption/desorption, HRTEM, XPS and H-TPR. The results show that three kinds of CeO with different structures can be formed by different preparation methods. This is mainly reflected in the differences in pore structure, particle size and crystal plane. CeO-DC obtained from directly calcined Ce(NO)·6HO had the largest pore volume and pore diameter and smallest particle size. CeO-DC was mainly exposed to the (200) plane. Combined with the results of the ability test, it could be concluded that when Pd and Pd exist at the same time, the activity increases with an increase in the proportion of Pd. Meanwhile, the structure of CeO affects the formation of oxygen vacancies, thereby affecting the adsorption and degradation of benzene. This article reveals that the particle size, crystal planes, oxygen vacancies and proportion of Pd have a great impact on the catalytic combustion of benzene and allow a more comprehensive understanding of the structure-activity relationship, which can guide us to design high-efficiency catalysts targeted to obtain suitable CeO-based catalysts for the catalytic combustion of benzene.