Alkali-treatment technique - New method for modification of structural and acid-catalytic properties of ZSM-5 zeolites
Alkali-treatment technique - New method for modification of structural and acid-catalytic properties of ZSM-5 zeolites
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DOI：
10.1016/s0926-860x(01)00645-7
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发表时间：
2001-10-05
影响因子：
5.5
通讯作者：
Matsukata, M
中科院分区：
文献类型：
--
作者：
Ogura, M;Shinomiya, SY;Matsukata, M
将SiO_2/Al_2O_3摩尔比为39.4的ZSM-5沸石在氢氧化钠碱性溶液中处理，考察了其结构和酸性的变化。一种硅质物种被选择性地从沸石骨架中溶解出来，尽管也有少量的铝被洗脱。在此过程中，沸石上形成了大小均匀的中孔，但仍保持着微孔结构。碱处理提高了异丙苯的催化裂化活性，但酸性变化不大。这可以用以下事实来解释：通过中孔的产生，异丙苯在ZSM-5微孔中的吸附和扩散性能得到了提高。(C)2001 Elsevier Science B.V.保留所有权利。
ZSM-5 zeolite having a SiO2/Al2O3 molar ratio of 39.4 was treated in a NaOH alkali solution and the changes in structural and acidic properties were investigated. A siliceous species was selectively dissolved from the framework of zeolite, although a lower amount of Al was also eluted. In this procedure, mesopores with a uniform size were formed on the zeolite, while the microporous structure remained. The acidic property was changed very little quantitatively or qualitatively, even though the catalytic activity for cracking of cumene was enhanced by the alkali-treatment. This can be explained by the facts that adsorptive and diffusive properties of cumene through micropores of the ZSM-5 are increased by the creation of mesopores. (C) 2001 Elsevier Science B.V. All rights reserved.