A simple route to synthesize mesoporous ZSM-5 templated by ammonium-modified chitosan.
A simple route to synthesize mesoporous ZSM-5 templated by ammonium-modified chitosan.
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DOI：
10.1002/chem.201201614
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发表时间：
2012-12
期刊：
影响因子：
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通讯作者：
Junjiang Jin;Xingdi Zhang;Yongsheng Li;H. Li;W. Wu;Yunlong Cui;Qian Chen;Liang Li;Jinlou Gu;Wenru Zhao;Jianlin Shi
中科院分区：
文献类型：
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作者：
Junjiang Jin;Xingdi Zhang;Yongsheng Li;H. Li;W. Wu;Yunlong Cui;Qian Chen;Liang Li;Jinlou Gu;Wenru Zhao;Jianlin Shi
以氨改性壳聚糖为介孔模板剂，以四丙基氢氧化铵(TPAOH)为模板剂，采用简单的水热合成法，成功地合成了均一的介孔分子筛ZSM-5晶体。结果表明，介孔ZSM-5晶体中存在直径为5~20 nm的中孔与微孔网络共存。氨改性壳聚糖是一种介孔剂，通过强烈的静电相互作用与沸石前驱体自组装。在2-羟基苯乙酮与苯甲醛的Claisen-Schmidt缩合反应和十二酸与2-乙基己醇的酯化反应中，所制备的介孔ZSM-5的催化活性明显高于传统的ZSM-5和Al-MCM-41。
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.