Synthesis and Characterization of Hierarchical ZSM-5 Zeolites with Outstanding Mesoporosity and Excellent Catalytic Properties.
Synthesis and Characterization of Hierarchical ZSM-5 Zeolites with Outstanding Mesoporosity and Excellent Catalytic Properties.
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DOI：
10.1186/s11671-018-2779-8
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发表时间：
2018-11-15
影响因子：
--
通讯作者：
Li F
中科院分区：
文献类型：
--
作者：
Song G;Chen W;Dang P;Yang S;Zhang Y;Wang Y;Xiao R;Ma R;Li F
制备了一种新型的软模板（ST），并成功地将其作为介孔剂合成了介孔性能优异、层次因子高的ZSM-5分子筛。制备的软模板在高温水热结晶过程中可以通过- si - o - si -共价键与MFI框架稳定连接。这种连接方式可以有效地避免非晶材料的形成，并且这种软模板的特殊结构可以有效地引入大量的介孔，而微孔的消耗很少。合成的分级ZSM-5分子筛颗粒尺寸约为1 μm，由60 ~ 150 nm的纳米晶体组成。采用x射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、氮吸附、扫描电镜（SEM）、透射电镜（TEM）、NH3程序升温解吸（NH3- tpd）和热重（TG）等技术对样品的结构参数进行了表征。由于沸石的性质和很大的微孔隙度，这些分层样品对水热处理有很大的耐受性。并且由于其晶内介孔、大的外表面积和丰富的可达酸位，无论是在反应物的转化率还是产物的选择性上，分层样品在苯与苯醇的烷基化反应、1,3,5-三异丙苯的裂化反应和低密度聚乙烯（LDPE）的热裂化反应中都表现出优异的催化性能。本文的在线版本（10.1186/s11671-018-2779-8）包含补充材料，可供授权用户使用。
A novel soft-template (ST) is fabricated and successfully employed as mesoporogen to synthesis hierarchical ZSM-5 zeolites with outstanding mesoporosity and high hierarchy factors. The as-produced soft-template can connect steadily with the MFI frameworks by covalent bonds of –Si–O–Si– during the high-temperature hydrothermal crystallization process. This type of connection mode can effectively avoid the formation of amorphous materials, and the specific structure of this soft-template can efficiently introduce plentiful of mesopores with few micropores being consumed. The particles of as-synthesized hierarchical ZSM-5 zeolites are in size of about 1 μm, which are made up of nanocrystals of 60–150 nm. The structure parameters of these samples are characterized with the techniques of X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, nitrogen sorption, scanning electron microscope (SEM), transmission electron microscope (TEM), NH3 temperature-programmed desorption (NH3-TPD) and thermogravimetric (TG). Due to the nature of zeolites and great microporosity, these hierarchical samples present great tolerance of hydrothermal treatment. And because of the intracrystalline mesopores, large external surface areas, and abundant accessible acid sites, whether in conversion rate of reactants or selectivity of products, the hierarchical samples exhibit excellent catalytic performance in the reactions of alkylation between benzene and benzyl alcohol, cracking of 1,3,5-tri-isopropylbenzene, and thermal cracking of low-density polyethylene (LDPE), respectively. The online version of this article (10.1186/s11671-018-2779-8) contains supplementary material, which is available to authorized users.
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影响因子：
15
作者：
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作者：
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