Catalytic Decomposition Of MTBE Used CeO₂/Al₂O₃ Prepared By Sol-Gel Method

With the rapid development of modern economy and society,environmental pollution has gradually attracted people's attention.In recent years,the exhaust of ships,the exhaust of motor vehicles,the volatilization of oil and gas,and the use of organic solvents have caused a large amount of pollution of volatile organic compounds.Due to volatile organic compounds have the characteristics of being explosive and volatile,being poisonous,and difficult to handle,the problem of effective treatment of volatile organic compounds pollution has become a hot issue in society today.In view of the fact that methyl tertiary butyl ether is one of the important components of volatile organic pollutants,it is widely used and harms human health and destroys the ecology.Therefore,it is necessary to use economical and environmentally treatment technology to effectively degrade methyl tertiary butyl ether,so realize an understanding of environmental protection.It can be seen that the research on the degradation of methyl tertiary butyl ether is a great significance to the management of volatile organic compounds.According to the actual emission of pollutants,the catalytic decomposition of methyl tertiary butyl ether was studied in this paper by using gas-phase catalytic oxidation and liquid-phase photo catalytic decomposition models.Gas chromatographic detection technology was used to monitor the reactants and products on-line to analyze the decomposition of methyl tertiary butyl ether under different conditions.A suitable method was selected to prepare a high-performance and high-stability catalyst,which was characterized by X-ray diffraction(XRD)and scanning electron microscope(FE-SEM),and applied to the catalytic cecomposition of methyl tertiary butyl ether.It is worth noting that the prepared nano-scale catalyst has a large specific surface area and good catalytic performance by achieving low-temperature catalytic decomposition of methyl tertiary butyl ether.In the catalytic oxidation experiment,the methyl tertiary butyl ether was transferred to a quartz tube continuous fluidized bed reactor through a bubbler to perform the reaction more closely to the actual situation.In the photocatalytic degradation experiment,a cylindrical glass container was used as a reactor,and the photocatalytic degradation experiment of methyl tertiary butyl ether was performed in a photochemical reactor by ultraviolet light irradiation using a high-pressure mercury lamp.The gas-liquid two-phase analysis experiment provides a solid foundation for the systematic study of the decomposition of methyl tertiary butyl ether.The results of catalytic oxidation experiments show that:for the oxidative decomposition of methyl tertiary butyl ether,the CeO2 catalyst prepared by the sol-gel method has a better catalytic effect,and the catalyst further supported by Al2O3 has the best catalytic activity,making the methyl tertiary butyl ether could completely decomposed at 300?.At the same time,the decomposition products of methyl tertiary butyl ether are mainly isobutylene and methanol,and also contain a small amount of CO2 and H2O.In the photocatalytic degradation experiment,the decomposition effect of methyl tertiary butyl ether decreased with increasing concentration.When the amount of CeO2 catalyst is 0.75 g/L,it has the best catalytic effect,which could make the 100 ppm methyl tertiary butyl ether solution almost completely degraded in 120 min of photocatalytic reaction.