Abstract
γ-MnO2 nano-sieve membrane was synthesized using γ-MnO2 nanometer powders by suspending particles sintering method. The results of BET, AFM, and SEM indicate that γ-MnO2 nano-sieve membrane with a thickness of about 2μm is porous (pore size 4nm), and has a smooth surface. The results of XRD and TPR exhibit that the phase transformation which can be suppressed at La/Mn = 0.15, and the activity of oxygen center of γ-MnO2 nano-sieve membrane (La/Mn = 0.15) is slightly lower than that of γ-MnO2 nanometer powders. γ-MnO2 nano-sieve membrane shows a higher separation factor of H2/Ar in the range of 50–300°C. In addition, the γ-MnO2 nano-sieve membrane was applied to the membrane reactor for cyclohexane oxidative dehydrogenation, and the effect of temperature on cyclohexane conversion was investigated. The result shows that cyclohexane conversion in the γ-MnO2 nano-sieve membrane reactor is higher than that in the conventional packed bed reactor.
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