Catalytic Oxidation of Toluene over Manganese and Cerium Complex Oxide Supported on Zeolite

Abstract

The air pollution caused by VOCs emssions has drawn considerable attention in recent years. Many catalyst systems with excellent activity were studied for the catalytic oxidation of VOCs. In this work, using air containing toluene as the simulation of industrial emissions, MnOx-CeO2/Powder zeolite and MnOx-CeO2/Honeycomb zeolite catalyst samples prepared by the isometric impregnation method were studied for catalytic performance of toluene. The catalysts were characterized by SEM, BET, XRD, SEM, H2-TPR and O2-TPD. The research results obtained showed that MnOx-CeO2/Powder zeolite catalysts exhibited better activity than MnOx-CeO2/Honeycomb zeolite catalyst at lower temperatures, the MnOx-CeO2/Powder zeolite catalyst presented better catalytic performance with T50=223°Cand T99=275°Cunder the condition of GHSV of 15000h−1 and toluene concentration of 100ppm, which is 23°Cand 47°Clower than MnOx-CeO2/Honeycomb zeolite, respectively. The characterization results also indicated that the catalytic activity was relavant closely with specific surface area, active oxygen species, catalyst morphology and valence of manganese and cerium oxides. Also, the catalyst has an excellent stability in the catalytic combustion towards toluene.