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Template‐Synthesized Porous Silicon Carbide as an Effective Host for Zeolite Catalysts
Author(s) -
Gu Lijun,
Ma Ding,
Yao Songdong,
Liu Xiumei,
Han Xiuwen,
Shen Wenjie,
Bao Xinhe
Publication year - 2009
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200901982
Subject(s) - materials science , sintering , porosimetry , thermogravimetric analysis , silicon carbide , calcination , chemical engineering , zeolite , scanning electron microscope , porosity , catalysis , composite material , porous medium , chemistry , organic chemistry , engineering
A facile method has been developed for the fabrication of porous silicon carbide (SiC) by means of sintering a mixture of SiC powder and carbon pellets at a relatively lower temperature, that is, 1450 °C, in air. The pore density and the total pore volume of the resulting porous SiC could be tuned by changing the initial SiC/C weight ratio. The structure evolution and the associated property changes during the preparation were examined through X‐ray diffraction, scanning electron microscopy, thermogravimetric analysis, 29 Si magic‐angle spinning (MAS) NMR spectroscopy, and mercury‐intrusion porosimetry analyses. Silica and SiO x C y ceramics formed in situ during the calcination process acted as binders of the porous SiC grains. The porous SiC can be used as a host for the growth of ZSM‐5 zeolite crystals to form the ZSM‐5/porous‐SiC composite material. After loading another catalytic active component of molybdenum, a novel catalytic material, Mo‐ZSM‐5/porous‐SiC, was obtained, which exhibited improved catalytic activity in the methane dehydroaromatization reaction.