Preparation of Mn2O3-Co3O4 and its xylene removal by oxidation

Abstract

Xylene is one of the main components of volatile organic compounds (VOCs), the catalytic oxidation of xylene has been studied. In this work, the manganese-cobalt mixed oxide catalysts for the xylene removal have been prepared by one step direct decomposition method with the aid of glucose. The physicochemical properties of the catalysts were characterized by TG, XRD, TEM, BET, TPR and XPS. The catalytic experiments results show that the Mn-Co catalysts are composite oxides composed of Mn2O3 and Co3O4. The Mn1Co1.4Ox catalyst with the molar ratio of Mn to Co of 1:1.4 has excellent oxidation removal performance of xylene. At the space velocity of 20000 mL (g·h)−1 and the concentration xylene of 500 ppm, the temperature of complete conversion of xylene is 210 °C, which is related to the developed pore structure, high specific surface area, excellent reduction performance, abundant adsorbed oxygen species, coexistence and interaction of polyvalent species. The space structure and competitive adsorption of reactants make the oxidation performance of low polarity p-xylene better. The participation of water vapor reduced the catalytic performance of the reaction system by 12-19%, which is related to the ads-desorption of water molecules and the decomposition of active components.

Keywords

• Direct one-step decomposition method
• Mn2O3-Co3O4 composite oxide
• Synergy effect
• Xylene removal