Effect of Particle Size and Crystal Surface of CeO2 on the Catalytic Combustion of Benzene.

Zhuo Wang,Shufeng Zuo,Jie Zheng,Zhu Chen

doi:10.3390/ma13245768

Abstract

In this study, three kinds of CeO2 were synthesized, and supported PdOx (x = 0,1) catalysts were prepared for benzene catalytic combustion. The samples were characterized by XRD, N2 adsorption/desorption, HRTEM, XPS and H2-TPR. The results show that three kinds of CeO2 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. CeO2-DC obtained from directly calcined Ce(NO3)3·6H2O had the largest pore volume and pore diameter and smallest particle size. CeO2-DC was mainly exposed to the (200) plane. Combined with the results of the ability test, it could be concluded that when Pd2+ and Pd0 exist at the same time, the activity increases with an increase in the proportion of Pd2+. Meanwhile, the structure of CeO2 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 Pd2+ 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 CeO2-based catalysts for the catalytic combustion of benzene.

Highlights

Volatile organic compounds (VOCs) are a main component of air pollution and have been increasing rapidly in recent years
Three kinds of CeO2 were obtained by purchase, calcining of Ce(NO3 )3 ·6H2 O
Three kindsofofCe-metal–organic frameworks (MOF), CeO2 were obtained by purchase, of Ce(NOparticle

Summary

Introduction

Volatile organic compounds (VOCs) are a main component of air pollution and have been increasing rapidly in recent years. Most VOCs harm the environment and threaten human health due to their toxicity and carcinogenicity [1,2,3]. As a kind of VOCs, are considered to cause great harm to the environment and are usually toxic and carcinogenic [4,5]. Benzene is a kind of carcinogen, which can be determined to be carcinogenic. Ethylbenzene and xylene are all possible carcinogens [6]. Benzene, toluene, ethylbenzene and xylene (BTEX) constitute the majority of the total industrial emissions [7].

Methods

Discussion

Conclusion