Gradient porous Co–Cu–Mn mixed oxides modified ZSM-5 membranes as high efficiency catalyst for the catalytic oxidation of isopropanol

Abstract

Novel gradient porous mixed cobalt–copper–manganese mixed oxides modified ZSM-5 membrane catalysts were synthesized by the incipient wetness impregnating method. The paper-like sintered stainless steel fibers (PSSF) support was fabricated by the wet lay-up papermaking/sintering process, and the ZSM-5 membranes were synthesized on the surface of stainless steel fibers by using secondary growth process. These novel modified membrane catalysts have been characterized by a series of techniques including SEM, EDS mapping, XRD, N2 adsorption–desorption, XPS and H2-TPR method. Catalytic performances of isopropanol oxidation over these novel catalysts were investigated. Among the series of catalysts, the as-prepared Co–Cu–Mn (1:1:1)/ZSM-5/PSSF catalysts have exhibited the best catalytic activity, demonstrating by a lowest T90% at 210°C. The gradient porous modified ZSM-5 membrane as high efficiency catalyst can offer a much higher catalytic activity, excellent reaction stability, and higher contact efficiency.