Preparation Of Supported PI-ZrO₂ Hybrid Membrane And It's Application In Catalytic Reactions Of C₃H₈ With CO₂ To C₃H₆

In this paper, kieselguhr-mullite ceramic membrane substrate(K-M) was prepared by the method of solid particle sintering line-compounding. Transition layer ceramic membrane of silica supported on K-M(SiO2/K-M) and Supported polyimed-zirconia hybrid membrane were synthesized by the technique of Sol-Gel. TG-DTA,SEM,XRD,IR,BET and gas permeability measurements have been employed to observe and test each membrane. The results showed that each membrane was satisfied with well morphology, tightly link between membranes, and the pore distribution of each membrane was narrow. The content of ZrO2 could greatly influent the thermal stability of the hybrid membrane, which there was an optimization. There were different hybrid types between ZrO2 and PI. The content of ZrO2 could also influent the hybrid type. The pore size of the hybrid membrane was relatively small. The separation coefficient of propane/propene was 1.5.MoO3-SiO2 (MoSiO) surface complex supports were prepared by surface modification. Pd-Cu bimetallic catalysts were prepared by incipient impregnation. The conversional reaction and membrane catalytic reaction for propane oxidative dehydrogenation to porpene have been studied. In the condition of ambient pressure and 600℃, the conversion of propane was 26.94%, and the selectivity of propene was 78.34%. By relating the physical and chemical characters of catalysts with their performance in reaction, a reaction mechanism was proposed and the factors that influence the activity of the catalysts were also studied.Hybrid membrane catalytic reactivity of propane partial oxidation to porpene by CO2 has been investigated, with PI-ZrO2/SiO2/K-M hybrid membrane tube as reactor and Pd-Cu/MoSiO as catalyst. The result showed that the reactivities of membrane reactions were always better than the conventional catalytic ones when carried out under the same conditions. In the condition of ambient pressure and 400℃, space velocity of 1200h-1, sweep gas velocity of 60ml/min, CO2/C3H8＝1, the conversion of propane was 7.55%, 1.12% higher than conversional reaction; and the selectivity of propene was 95.77%, which 2.55% higher than conversional reaction.