Catalytic function of boron to creating interconnected mesoporosity in microporous Y zeolites and its high performance in hydrocarbon cracking
Catalytic function of boron to creating interconnected mesoporosity in microporous Y zeolites and its high performance in hydrocarbon cracking
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DOI：
10.1016/j.jcat.2017.01.017
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发表时间：
2017-03-01
影响因子：
7.3
通讯作者：
Shen, Baojian
中科院分区：
文献类型：
--
作者：
Mi, Shuo;Wei, Tao;Shen, Baojian
沸石中介孔的连通性是高效催化剂设计的关键因素，在不使用有机模板的情况下仍然是一个挑战。在此，通过将催化量的硼引入到NaY的骨架中，然后进行蒸汽处理，合成了分级多孔Y沸石（USYB）。骨架硼的引入促进了汽蒸处理中周围Si-O-Al和Si-O-B键的水解。当硼从骨架中脱出时，它可以通过汽蒸进一步产生更多的介孔。人们认为硼起到催化作用，导致产生良好互连的中孔。结果，沸石的介孔体积相对增加了46%。在 USYB 沸石上异辛烷（即 2,2,4-三甲基戊烷）和 1,3,5-三异丙苯（TIPB）裂解中证明了产生的互连介孔对较高活性的影响。与常规USY沸石相比，USYB催化剂用于重油裂化汽油收率可提高2.1%。 (C) 2017 Elsevier Inc. 保留所有权利。
Connectivity of mesopores in zeolites, which is a key factor for the high efficiency catalyst design, is still a challenge to be generated without using organic template. Herein, a hierarchical porous Y zeolite (USYB) was synthesized by introducing catalytic amounts of boron into the framework of NaY, followed by steaming. The introduction of framework boron promoted the hydrolysis of the surrounding Si-O-Al and Si-O-B bonds in steaming treatment. When the boron was dislocated from framework, it could further create more mesopores by steaming. It was deemed that boron played catalytic like role for leading to generate well interconnected mesoporosity. As a result, the mesopore volume of the zeolite increased by 46% relatively. The influence of the generated interconnected mesoporosity on the higher activity was evidenced in both iso-octane (i.e. 2,2,4-trimethylpentane) and 1,3,5-triisopropylbenzene (TIPB) cracking over USYB zeolite. Compared with conventional USY zeolite, there would be 2.1% increase in the yield of gasoline for the cracking of heavy oil over USYB catalyst. (C) 2017 Elsevier Inc. All rights reserved.