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首页> 外文期刊>Chemistry: A European journal >A simple route to synthesize mesoporous ZSM-5 templated by ammonium-modified chitosan
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A simple route to synthesize mesoporous ZSM-5 templated by ammonium-modified chitosan

机译：铵改性壳聚糖合成介孔ZSM-5模板的简单方法

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摘要

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 5-20nm 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. Mesoporous zeolite: Ammonium-modified chitosan served as a mesoporogen in the hydrothermal synthesis of mesoporous zeolite Socony Mobil (ZSM)-5, self-assembling with the zeolite precursor through strong static interactions (see figure; TPA=tetrapropylammonium, HTCC=N-(2-hydroxy)propyl-3-trimethylammonium chitosan chloride).
机译：通过简单的水热合成方法，分别使用铵改性的壳聚糖和氢氧化四丙基铵（TPAOH）作为中观和微型模板，已经成功地制备了均匀的介孔沸石ZSM-5晶体。结果表明，中孔ZSM-5晶体中直径为5-20nm的中孔与微孔网络共存。铵改性的壳聚糖被证明可作为介孔原，通过强烈的静电相互作用与沸石前体自组装。不出所料，与传统的ZSM-5和Al-MCM-41相比，制备的介孔ZSM-5在涉及大分子的反应中表现出大大增强的催化活性，例如2-羟基苯乙酮与苯甲醛的Claisen-Schmidt缩合反应和十二酸和2-乙基己醇。介孔沸石：铵改性的壳聚糖在介孔沸石Socony Mobil（ZSM）-5的水热合成中充当介孔原，通过强烈的静电相互作用与沸石前体自组装（见图; TPA =四丙基铵，HTCC = N- 2-羟基）丙基-3-三甲基氯化铵壳聚糖）。

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