首页> 外文期刊>Microporous and mesoporous materials: The offical journal of the International Zeolite Association >Directing gel: An effective method tailoring morphology of MWW zeolites and their catalytic performance in liquid-phase alkylation of benzene with ethylene
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Directing gel: An effective method tailoring morphology of MWW zeolites and their catalytic performance in liquid-phase alkylation of benzene with ethylene

机译:定向凝胶:一种定制MWW沸石的形态及其在苯与乙烯液相烷基化中的催化性能的有效方法

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摘要

The directing gel method was developed to tailor morphology, textural property, acidity and catalytic performance of MWW catalysts. Directing gel was defined as large amounts of crystal precursors without any typical diffraction peaks corresponding to MWW zeolites. The synthesis of directing gel was stopped at the end of induction period, and then additional materials were added to further crystallization. Via directing gel method, not only did the final MWW zeolites possess high crystallinity, but also the morphology were remarkably changed into irregular MWW sheets packed in disorder, which was completely different from rose-like shape of the reference MCM-22 via conventional hydrothermal synthesis. Besides morphology tailoring, the textural property (esp. external surface area and pore volumes) and acid sites of final 1VIWW zeolites were also improved. The increases of ethylene conversion of directing gel catalysts were attributed to the better accessibility of active centers jointly induced by their morphology, textural property and acidity. (C) 2015 Elsevier Inc. All rights reserved.
机译:开发了定向凝胶法,以调整MWW催化剂的形貌,质地,酸性和催化性能。定向凝胶定义为大量的晶体前体,没有任何对应于MWW沸石的典型衍射峰。在诱导期结束时停止定向凝胶的合成,然后添加额外的材料以进一步结晶。通过直接凝胶法,不仅最终的MWW沸石具有较高的结晶度,而且形态也明显改变为无规堆积的不规则MWW片,这与常规水热合成法完全不同于参比MCM-22的玫瑰状形状。 。除了形态剪裁外,最终1VIWW沸石的质构性质(特别是外表面积和孔体积)和酸位也得到了改善。定向凝胶催化剂的乙烯转化率增加归因于活性中心的形态,质地和酸性共同诱导的更好的可及性。 (C)2015 Elsevier Inc.保留所有权利。

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