title: A simple route to synthesize mesoporous ZSM-5 templated by ammonium-modified chitosan.
abstract: Uniform mesoporous zeolite ZSM-5 crystals have been successfully fabricated through a simple hydrothermal synthetic method by utilizing ammonium-modified chitosan and tetrapropylammonium hydroxide (TPAOH) as the meso- and microscale template, respectively. It was revealed that mesopores with diameters of 5-20 nm coexisted with microporous network within mesoporous ZSM-5 crystals. Ammonium-modified chitosan was demonstrated to serve as a mesoporogen, self-assembling with the zeolite precursor through strong static interactions. As expected, the prepared mesoporous ZSM-5 exhibited greatly enhanced catalytic activities compared with conventional ZSM-5 and Al-MCM-41 in reactions involving bulky molecules, such as the Claisen-Schmidt condensation of 2-hydroxyacetophenone with benzaldehyde and the esterification reaction of dodecanoic acid and 2-ethylhexanol.
authors.affiliation: Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, No. 130 Mei-long Road, Shanghai 200237, PR China.
authors.forename: Junjiang
authors.initials: J
authors.lastname: Jin
authors.forename: Xingdi
authors.initials: X
authors.lastname: Zhang
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Li
authors.forename: Hua
authors.initials: H
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Wu
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Cui
authors.forename: Qian
authors.initials: Q
authors.lastname: Chen
authors.forename: Liang
authors.initials: L
authors.lastname: Li
authors.forename: Jinlou
authors.initials: J
authors.lastname: Gu
authors.forename: Wenru
authors.initials: W
authors.lastname: Zhao
authors.forename: Jianlin
authors.initials: J
authors.lastname: Shi