Catalytic Properties of a Hierarchical Zeolite Synthesized from a Natural Aluminosilicate Mineral without the Use of a Secondary Mesoscale Template
Catalytic Properties of a Hierarchical Zeolite Synthesized from a Natural Aluminosilicate Mineral without the Use of a Secondary Mesoscale Template
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不使用二级介观模板由天然铝硅酸盐矿物合成的分级沸石的催化性能
DOI：
10.1002/cctc.201300049
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发表时间：
2013-08-01
期刊：
影响因子：
4.5
通讯作者：
Bao, Xiaojun
中科院分区：
文献类型：
--
作者：
Ding, Jiajia;Liu, Haiyan;Bao, Xiaojun
以天然层状铝硅酸盐矿物直托石为原料，在不使用二次介尺度模板的情况下，成功合成了具有双峰介孔体系、高结晶度、大表面积和大介孔体积的ZSM-5级沸石。对分级ZSM-5分子筛的理化性质和催化性能进行了广泛的表征。结果表明：合成的分级ZSM-5分子筛的介孔是由ZSM-5分子筛的原生纳米棒结构形成的，其介孔几乎为裂隙状的晶间孔。结晶过程分析表明，未溶解累托石碎屑作为种子晶体，具有结构导向作用，是影响分级结构形成的关键因素。这种分级ZSM-5分子筛由于其独特的结构特征和酸位的可及性，具有显著增强的1,3,5-三异丙苯裂解活性，显著提高的异丙烯转化抗失活能力，以及显著改善的重油裂解丙烯性能。
A hierarchical ZSM-5 zeolite with a bimodal meso-microporous system, high crystallinity, and a large surface area and meso-micropore volume was successfully synthesized from a natural layered aluminosilicate mineral rectorite without using a secondary mesoscale template. The physicochemical and catalytic properties of the hierarchical ZSM-5 zeolite were extensively characterized. The results showed that the mesopores of the synthesized hierarchical ZSM-5, which are almost slitlike inter-crystal pores, originate from the construction of primary nanorods of the ZSM-5 zeolite. Analysis of the crystallization process revealed that the undissolved rectorite debris acted as seed crystals and played a structure-directing role, which is the key factor that influences the formation of the hierarchical structure. Such a hierarchical ZSM-5 zeolite, as a result of its unique structural characteristics and increased accessibility of acid sites, possessed a remarkably enhanced activity for the cracking of 1,3,5-triisopropylbenzene, a dramatically higher anti-deactivation ability for cumene conversion, and a significantly improved propylene-boosting performance for heavy oil cracking than the other catalysts tested.