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首页> 美国卫生研究院文献>Science and Technology of Advanced Materials >Synthesis of core–shell structured FAU/SBA-15 composite molecular sieves and their performance in catalytic cracking of polystyrene
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Synthesis of core–shell structured FAU/SBA-15 composite molecular sieves and their performance in catalytic cracking of polystyrene

机译：核-壳结构的FAU / SBA-15复合分子筛的合成及其在聚苯乙烯催化裂化中的性能

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摘要

Composite molecular sieves, FAU/SBA-15, having core-shell structure were synthesized. The synthesized composite sieves were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), pyrolysis fourier transform infrared (Py-FTIR) spectroscopy, temperature programmed desorption spectra (NH3-TPD), UV Raman spectroscopy, nuclear magnetic resonance (NMR) and other techniques. XRD, SEM, TEM, N2 adsorption-desorption, mass spectrometry, NMR and EDS results showed that the composite molecular sieve contained two pore channels. Py-FTIR results showed that the addition of HY molecular sieves improved the acidity of the composite zeolite. The crystallization mechanism during the growth of FAU/SBA-15 shell was deduced from the influence of crystallization time on the synthesis of FAU/SBA-15 core-shell structured composite molecular sieve. HY dissociated partially in H2SO4 solution, and consisted of secondary structural units. This framework structure was more stable than its presence in the isolated form on the same ring or in the absence of Al. Thus it played a guiding role and connected with SBA-15 closely through the Si-O bond. This resulted in the gradual covering of the exterior surface of FAU phase by SBA-15 molecular sieves. The presence of SBA-15 restricted the formation of the other high mass components and increased the selectivity towards ethylbenzene.
机译：合成具有核-壳结构的复合分子筛FAU / SBA-15。通过X射线衍射法（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），能量色散X射线光谱法（EDS），热解傅立叶变换红外光谱法（Py-FTIR）对合成的复合筛进行了表征，程序升温解吸光谱（NH3-TPD），紫外拉曼光谱，核磁共振（NMR）等技术。 XRD，SEM，TEM，N2吸附-解吸，质谱，NMR和EDS结果表明，复合分子筛具有两个孔道。 Py-FTIR结果表明，HY分子筛的加入提高了复合沸石的酸度。由结晶时间对FAU / SBA-15核壳结构复合分子筛合成的影响，推导了FAU / SBA-15壳生长过程中的结晶机理。 HY在H2SO4溶液中部分解离，由二级结构单元组成。该框架结构比其在相同环上或在不存在Al的情况下以分离形式存在更稳定。因此，它发挥了指导作用，并通过Si-O键与SBA-15紧密相连。这导致SBA-15分子筛逐渐覆盖FAU相的外表面。 SBA-15的存在限制了其他高质量组分的形成，并增加了对乙苯的选择性。

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