Liu Changhou

Synthesis and characterization of Fe-MFI zeolite membrane on a porous α-Al2O3 tube

Fe-MFI and MFI membranes have been prepared by in-situ hydrothermal treatment on porous α-Al 2 O 3 tubes. It has been shown by XRD, IR, SEM and single gas permeation measurements that the crack-free Fe-MFI zeolite membrane are formed and Fe species are incorporated into the framework of zeolite. The permeation rate of H 2 and separation factor (H 2 /C 3 H 8 ) for the synthesized Fe-MFI zeolite membrane are 3.0x10 -6 mol/s.m 2 .Pa and 25.8, respectively. About 15% conversion increase of ethylbenzene to styrene using the membrane as a reactor is achieved over the fixed-bed reactor. The reactivity of the Fe-MFI membrane is better than that of the Al-ZSM-5 membrane. The reason may be that the Fe-ZSM-5 preferentially adsorbs the ethylbenzene, which may be beneficial to the conversion of ethylbenzene, and the adsorption amount of styrene on Fe-ZSM-5 is much less than that on Al-ZSM-5, which may favorably prevent carbon deposition on the Fe-ZSM membrane and result in a higher conversion of ethylbenzene.

The Formation of Ethane from Carbon Dioxide under Cold Plasma

Pulsed-corona plasma has been used as a new method for ethane dehydrogenation at low temperature and normal pressure using carbon dioxide as an oxidant in this paper. The effect of carbon dioxide content in the feed, power input, and flow rate of the reactants on the ethane dehydrogenation has been investigated. The experimental results show that the conversion of ethane increases with the increase in the amount of carbon dioxide in the feed. The yield of ethylene and acetylene decreases with the increase in the yield of carbon monoxide, indicating that the increased carbon dioxide leads to the part of ethylene and acetylene being oxidized to carbon monoxide. Power input is primarily an electrical parameter in pulsed-corona plasma, which plays an important role in reactant conversion and product formation. When the power input reaches 16 W, ethane conversion is 41.0% and carbon dioxide conversion is 26.3%. The total yield of ethylene and acetylene is 15.6%. The reduced flow rate of feed improves the conversion of ethane, carbon dioxide and the yield of acetylene, and induces carbon deposit as well.