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

[Display omitted] •TPAOH VPT modification of structured ZSM-5/SiC foam catalysts.•Effective conversion of aluminosilicate binder to zeolitic phase by TPAOH vapor.•Enhanced catalytic performance of VPT modified ZSM-5/SiC foam catalyst in MTP reaction.•Intrinsic properties of SiC foam are beneficial t...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2017-09, Vol.545, p.104-112
Main Authors: Jiao, Yilai, Fan, Xiaolei, Perdjon, Michal, Yang, Zhenming, Zhang, Jinsong
Format: Article
Language:English
Subjects:
Acidity
Aluminosilicates
Aluminum silicates
Catalysis
Catalysts
Coke
Heat conductivity
Low pressure
Methanol
Methanol-to-propylene (MTP)
Pressure drop
Propylene
SiC foam
Structured catalyst
Tetrapropylammonium hydroxide (TPAOH)
Thermal conductivity
Transport phenomena
Vapor phases
Vapor-phase transport (VPT)
Vapors
ZSM-5
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Summary:[Display omitted] •TPAOH VPT modification of structured ZSM-5/SiC foam catalysts.•Effective conversion of aluminosilicate binder to zeolitic phase by TPAOH vapor.•Enhanced catalytic performance of VPT modified ZSM-5/SiC foam catalyst in MTP reaction.•Intrinsic properties of SiC foam are beneficial to MTP process. 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 0.5M TPAOH could effectively convert the amorphous aluminosilicate binder to the zeolitic phase with improved intracrystal mesopores, nanosized crystals (ca. 100nm), high concentration of acidity sites (83mmolg−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 (14Wm−1K−1 at 773K), 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. 970h (>95% methanol conversion) with the high selectivity to the propylene (>45%). The coke formation was significantly retarded (ca. 2.1×10−2wt.%h−1) due to the enhanced transport phenomena within the developed structured catalyst.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2017.07.036