大分子正十六烷的催化裂化

发布时间：2018-02-13 12:28

本文关键词： 多级孔催化裂化 MFI型分子筛正十六烷　出处：《高等学校化学学报》2017年08期 　论文类型：期刊论文

【摘要】：以具有新型多级孔中空薄壳结构的ZSM-5分子筛(Gel-ZSM-5)作为催化剂,正十六烷作为探针分子,研究了催化剂的孔道结构及酸性对大分子催化裂化反应的影响.实验结果表明,该催化剂中的介孔、大孔多级结构非常有利于大分子反应物、中间产物以及结焦物在其表面及内部的快速传输,从而大幅提高催化转化率并延长了催化剂寿命;另外,催化剂多级孔表面的大量酸性位点可以显著提高针对大分子的催化反应性能,并且明显改善了产物的选择性.在较短的反应时间下,这种构效关系体现得更加显著.因此,合理的酸性分布和多级中空薄壳孔道结构将赋予催化剂在大分子催化裂化中具有更好的催化活性、选择性及更长的催化寿命,为设计新型高效催化剂提供了依据.
[Abstract]:The effect of pore structure and acidity of ZSM-5 molecular sieve Gel-ZSM-5 on the catalytic cracking reaction of macromolecules was studied using n-hexadecane as probe molecule and ZSM-5 molecular sieve Gel-ZSM-5 with a new multi-pore hollow shell structure as catalyst. The mesoporous and multilevel mesoporous structure of the catalyst is very favorable for the rapid transport of macromolecular reactants, intermediate products and coking products on its surface and inside, thus greatly increasing the catalytic conversion and prolonging the catalyst life. A large number of acidic sites on the surface of the multi-pore catalyst can significantly improve the catalytic performance of the catalyst against macromolecules, and improve the selectivity of the products. At a short reaction time, the structure-activity relationship is more obvious. Reasonable acid distribution and multistage hollow thin shell pore structure will give the catalyst better catalytic activity, selectivity and longer catalytic life in macromolecular catalytic cracking, which provides the basis for the design of new high efficient catalyst.
【作者单位】：吉林大学化学学院无机合成与制备化学国家重点实验室;
【基金】：国家自然科学基金(批准号:21390394,91022030,20971052)资助~~
【分类号】：TE624.41

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