Study on catalytic removal of toluene by metal oxides derived from hydrotalcite

Hongbo Liu,Zhiyong Huang

doi:10.1051/e3sconf/202127201008

Abstract

Hydrotalcite (HT) precursor was synthesized by coprecipitation method, and the surface of HT precursor was modified. The mixed metal oxide (MO) catalyst was prepared by calcination of HT precursor, which was used to remove toluene from VOCs assisted by NTP technology. The catalytic performance of MO catalyst was investigated. The results show that the MO catalyst with good structure can be obtained after calcination of HT precursor before and after modification. The results of catalytic performance test showed that the initial concentration of toluene was 700 ppm, the gas flow rate was 600 mL/min, and the reaction time was 30 min, SIE of NTP was above 3.0 kJ/L, the toluene conversion rate reached above 90%. MO assisted NTP had better catalytic performance with lower energy consumption. The toluene treatment capacity per unit energy consumption increased from 15.3% to 20.6%, which had an increase of 34.6%.

Highlights

According to the definition of the World Health Organization (WHO), volatile organic compounds (VOCs) refer to the volatile organic compounds with saturated vapour pressure over 133.322Pa and boiling point between 50 °C and 260 °C at room temperature
It can be seen from the figure that the characteristic diffraction peak of HT precursor has almost disappeared
The samples before and after modification showed similar X-ray diffraction (XRD) patterns, which was consistent with the XRD results of HT precursors

Summary

Introduction

According to the definition of the World Health Organization (WHO), volatile organic compounds (VOCs) refer to the volatile organic compounds with saturated vapour pressure over 133.322Pa and boiling point between 50 °C and 260 °C at room temperature. The active components of catalysts for VOCs combustion can be divided into noble metal oxides and non-noble metal oxides. Non-noble metal oxide catalysts mainly include perovskite, spinel and composite oxide catalysts These catalysts are relatively low in price and show good catalytic performance. The development of the project has important practical significance and social benefits for effective control of VOCs emissions, environmental protection and promotion of human health. It will provide important experimental data for the research and development of structurally controllable metal oxide catalysts, and will have a wide application prospect in the field of new materials and environmental protection

Methods

Results

Conclusion