Abstract
Fe-MFI and MFI membranes have been prepared by in-situ hydrothermal treatment on porous a-Al2O3 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 H2 and separation factor (H2/C3H8) for the synthesized Fe-MFI zeolite membrane are 3.0×10−6 mol s−1 m−2 Pa−1 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.
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