TY - JOUR
T1 - Catalytic dehydration of methanol to dimethyl ether over micro-mesoporous ZSM-5/MCM-41 composite molecular sieves
AU - Tang, Qiang
AU - Xu, Hang
AU - Zheng, Yanyan
AU - Wang, Jinfu
AU - Li, Hansheng
AU - Zhang, Jun
PY - 2012/1/31
Y1 - 2012/1/31
N2 - A series of micro-mesoporous ZSM-5/MCM-41 composite molecular sieves were prepared by combining a microporous zeolite silica source with nano self-assembly methods, and characterized by SEM, TEM, XRD, N 2 adsorption and desorption, TPD of ammonia, and their catalytic performance for the dehydration of methanol to dimethyl ether (DME) in a fixed bed microreactor at atmospheric pressure. Among these catalysts, the ZSM-5/MCM-41 sample alkali-treated with 1.5 mol/L NaOH solution, in which the relative crystallinity of ZSM-5 and MCM-41 are 54.5% and 30.5%, respectively, gave the best activity (X MeOH > 80%) with 100% selectivity and a long lifetime in a wide range of temperature from 190 °C to 300 °C. From the characterization and activity data, the formation mechanism of the micro-mesoporous composite molecular sieves was proposed to be a liquid-crystal templating mechanism.
AB - A series of micro-mesoporous ZSM-5/MCM-41 composite molecular sieves were prepared by combining a microporous zeolite silica source with nano self-assembly methods, and characterized by SEM, TEM, XRD, N 2 adsorption and desorption, TPD of ammonia, and their catalytic performance for the dehydration of methanol to dimethyl ether (DME) in a fixed bed microreactor at atmospheric pressure. Among these catalysts, the ZSM-5/MCM-41 sample alkali-treated with 1.5 mol/L NaOH solution, in which the relative crystallinity of ZSM-5 and MCM-41 are 54.5% and 30.5%, respectively, gave the best activity (X MeOH > 80%) with 100% selectivity and a long lifetime in a wide range of temperature from 190 °C to 300 °C. From the characterization and activity data, the formation mechanism of the micro-mesoporous composite molecular sieves was proposed to be a liquid-crystal templating mechanism.
KW - Composite molecular sieves
KW - Dehydration
KW - Dimethyl ether
KW - Methanol
KW - Micro-mesoporous
UR - http://www.scopus.com/inward/record.url?scp=84855547705&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2011.10.039
DO - 10.1016/j.apcata.2011.10.039
M3 - Article
AN - SCOPUS:84855547705
SN - 0926-860X
VL - 413-414
SP - 36
EP - 42
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
ER -