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首页> 外文期刊>Catalysis science & technology >High yield synthesis of nanoscale high-silica ZSM-5 zeolites via interzeolite transformation with a new strategy
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High yield synthesis of nanoscale high-silica ZSM-5 zeolites via interzeolite transformation with a new strategy

机译：高收益的合成纳米级硅氧ZSM-5沸石通过interzeolite转换用一个新的策略

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摘要

A novel interzeolite transformation strategy using internally confined organic structure directing agents (OSDAs), called the "OSDA-confined" strategy, is proposed for highly crystalline nanosized high-silica ZSM-5 zeolite synthesis, by which high yield and fast synthesis of ZSM-5 is achieved using BEA zeolite as a raw material. The transformation process was investigated by XRD, SEM, ICP, FTIR and UV Raman spectroscopy, which revealed that the decomposition of a parent zeolite and the crystallization process of products were well modulated by the confined OSDA. The transformation process could be divided into three stages consisting of raw material deconstruction, small size product formation and product growth. The strong etching power of NaOH contributes to the fast decomposition of BEA zeolites. In addition, tetrapropylammonium hydroxide (TPAOH) as an OSDA was confined in the parent zeolite instead of being added into the mother liquid, achieving a high local concentration of TPAOH, which could reduce the decomposition rate of the parent BEA zeolite and promote the efficient organization of the building units generated by the decomposition of the BEA zeolite. Thereof, a high yield was achieved by the synergistic effect of NaOH and occluded TPAOH. During the interzeolite transformation process, the six-membered rings (6Rs), five-membered rings (5Rs) and four-membered rings (4Rs) in the BEA zeolite framework were disassembled and combined with the help of 5Rs to produce the ZSM-5 zeolite structure. Moreover, due to the nanoscale and large surface area, the obtained ZSM-5 zeolite catalyst showed extremely high catalytic activity in the self-etherification reaction of benzyl alcohol (BA) to dibenzyl ether (DE). This study provides insights into the interzeolite transformation process, which would be helpful for achieving size control and high-efficiency synthesis.
机译：小说interzeolite转换策略使用指导内部在有机结构代理(OSDAs),被称为“OSDA-confined”策略,提出了高度结晶纳米硅氧ZSM-5沸石合成的高收益和快速合成ZSM-5吗通过使用BEA沸石为原料。通过XRD研究了转换过程,SEM、ICP、红外光谱和紫外拉曼光谱表明父母的分解沸石和结晶的过程产品是调制的局限OSDA。分成三个阶段组成的原材料解构主义,形成和小尺寸产品产品的增长。有助于BEA的快速分解沸石。氢氧化(TPAOH)作为OSDA是封闭的父母沸石而不是补充说到母液,实现高的地方TPAOH浓度,从而减少父BEA沸石的分解率促进有效的组织建设单位分解生成的BEA沸石。氢氧化钠和协同效应的实现锢囚TPAOH。转换过程中,六元环(6 rs),五元环(5 rs)四元环(4 rs) BEA沸石框架是拆卸和结合帮助5 rs生产ZSM-5沸石结构。大的表面积,获得ZSM-5沸石催化剂表现出极高的催化活性在self-etherification苄反应酒精(BA)二苄基醚(DE)。提供了interzeolite见解转换过程,这将是有益的实现规模控制和高效合成。

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