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Effect of the template on the hydrothermal synthesis of mixed molecular sieves for methanol dehydration
Author(s) -
Xu Hang,
Zhang Dandan,
Wu Fengmin
Publication year - 2018
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12880
Subject(s) - microporous material , molecular sieve , mesoporous material , catalysis , methanol , mcm 41 , chemical engineering , ammonium bromide , materials science , dimethyl ether , fourier transform infrared spectroscopy , hydrothermal synthesis , hydrothermal circulation , chemistry , inorganic chemistry , organic chemistry , composite material , engineering , pulmonary surfactant
In this work, microporous–mesoporous H‐ZSM‐5/MCM‐41 mixed molecular sieves catalyst was successfully synthesized using a hydrothermal synthesis technology. Mesoporous MCM‐41 sieves were obtained by partial alkali treatment of microporous H‐ZSM‐5. The effect of the amount of template (i.e., cetyltrimethyl ammonium bromide, CTAB) on the preparation process of catalyst was investigated. The catalyst was characterized using X‐ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and N 2 adsorption–desorption. Methanol dehydration to dimethyl ether was selected to evaluate the catalytic performance of H‐ZSM‐5/MCM‐41. The content of mesoporous MCM‐41 in the mixed molecular sieve catalyst as well as its particle and pore sizes increased with the amount of CTAB, thereby enhancing the catalytic activity of the final material while keeping constant the microporous ZSM‐5 loadings. Thus, the amount of mesoporous MCM‐41 in the mixed molecular sieve catalyst reached a maximum at a CTAB loading of 10%, with the resultant material showing a maximum specific surface area of 335 m 2 /g and a mean pore size of 3.8 nm. Additionally, this material showed optimum catalytic activity (84% methanol conversion at 220°C). © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018