Vapor-phase transport (VPT) modification of ZSM-5/SiC foam catalyst using TPAOH vapor to improve the methanol-to-propylene (MTP) reaction

Yilai Jiao, Xiaolei Fan, Michal Perdjon, Zhenming Yang, Jinsong Zhang

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    Abstract

    Tetrapropylammonium hydroxide (TPAOH) was introduced in the vapor phase to perform the vapor-phase transport (VPT) modification of the structured ZSM-5 supported on SiC foam (ZSM-5/SiC foam) catalyst. An optimum precursor concentration of 0.5 M TPAOH could effectively convert the amorphous aluminosilicate binder to the zeolitic phase with improved intracrystal mesopores, nanosized crystals (ca. 100 nm), high concentration of acidity sites (82.8 mmol g−1) as well as a high value of the relative acidity (0.7). Combined with the intrinsic property of macroscopic SiC foams such as the low pressure drop and the high thermal conductivity (13.7 W m−1 K−1 at 773 K), TPAOH VPT modified ZSM-5/SiC foam catalyst demonstrated an excellent activity in the catalytic methanol-to-propylene (MTP) reaction, surpassing the state-of-the-art hierarchal ZSM-5 monolith catalyst. The catalyst showed an extended activity for ca. 970 h (> 95% methanol conversion) with the high selectivity to the propylene (> 45%). The coke formation was significantly retarded (ca. 0.021 wt.% h−1) due to the enhanced transport phenomena within the developed structured catalyst.
    Original languageEnglish
    Pages (from-to)104-112
    JournalApplied Catalysis A: General
    Volume545
    Early online date26 Jul 2017
    DOIs
    Publication statusPublished - 5 Sep 2017

    Keywords

    • Vapor-phase transport (VPT)
    • Tetrapentylammonium hydroxide (TPAOH)
    • ZSM-5
    • SiC foam
    • Structured catalyst
    • Methanol-to-propylene (MTP)
    • Thermal conductivity

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