Porous ceramic membranes (PCMs) are considered as an efficient hot gas filtration material in industrial systems. Functionalization of the PCMs with high-efficiency catalysts for the abatement of volatile organic compounds (VOCs) during dust elimination is a promising way to purify the industrial exhaust gases. In this work, we prepared PCMs (porosity: 70%) in a facile sintering process and integrated Cu-doped Mn-Ce oxides into the PCMs as monolithic catalysts by the sol-gel method for benzene oxidation. Through this method, the catalysts are dispersed evenly throughout the PCMs with excellent adhesion, and the catalytic PCMs provided more active sites for the reactant gases during the catalytic reaction process compared to the powder catalysts. The physicochemical properties of PCMs and catalytic PCMs were characterized systematically, and the catalytic activities were measured in total oxidation of benzene. As a result, all the prepared catalytic PCMs exhibited high catalytic activity for benzene oxidation. Significantly, the monolithic catalyst of Cu 0.2 Mn 0.6 Ce 0.2 /PCMs obtained the lowest temperature for benzene conversion efficiency of 90% (T 90 ) at 212 • C with a high gaseous hourly space velocity of 5000 h −1 and showed strong resistance to high humidity (90 vol.%, 20 • C) with long-term stability in continuous benzene stream, which is caused by abundant active adsorbed oxygen, more surficial oxygen vacancy, and lower-temperature reducibility.higher conversion efficiency at lower temperature [13][14][15][16]. A successful catalyst used for industrial applications usually requires high activity, stability, heat resistance, and low pressure drop during long-term operation for high airflow gaseous catalytic combustion. Therefore, a monolithic catalyst by functionalizing the PCMs with catalytic active ingredients is much necessary for the removal of VOCs during dedusting for air pollution control in the industrial application.Currently, the transition metal oxide catalysts, by considering economical and effective elements, are better alternatives in contrast to the noble metal catalysts [17,18]. Among all the transition metals, the synergistic effect of Mn and Ce mixed oxides exhibited enhanced catalytic activity during benzene oxidation [19][20][21][22][23] that generally attributed to the abundance, low cost, numerous oxidation states, and high poison-resistance of manganese oxides [24,25], and the super oxygen storage capacity of ceria oxides which are regarded as viable segments in the VOCs oxidation [26,27]. Moreover, to further improve physiochemical properties, the ternary metal oxides catalysts (e.g., Mn-Ce-Co [28,29], Mn-Ce-Zr [30], Mn-Ce-Cu [31-33],) are popularly used in the field of VOCs removal. Such series of catalysts exhibit higher catalytic activity than binary and single metal oxides and show excellent stability and water vapor resistance properties during a long-term reaction due to the synergistic effects. The ionic radius of Cu is between the ionic radius of Mn and Ce, so the Cu ions ...
