高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (10): 1930.

• 研究论文 • 上一篇    下一篇

铝化β沸石的硅铝分布及表面酸性质

包佳青, 谢在库, 陆贤, 陈庆龄   

  1. 中国石油化工股份有限公司上海石油化工研究院, 上海　201208
  • 收稿日期:2001-09-18 出版日期:2002-10-24 发布日期:2002-10-24
  • 通讯作者: 谢在库(1963年出生),男,博士,教授级高级工程师,从事沸石化学与催化反应工程研究.E-mail:xzk@sript.com.cn E-mail:xzk@sript.com.cn
  • 基金资助:

    中国石化重点科技攻关项目(合同号:499082)批准

Distribution of Silicon and Aluminium Atoms as Well as Surface Acid Properties of Aluminated β Zeolite

BAO Jia-Qing, XIE Zai-Ku, LU Xian, CHEN Qing-Ling   

  1. Shanghai Research Institute of Petrochemical Technology, Shanghai 201208, China
  • Received:2001-09-18 Online:2002-10-24 Published:2002-10-24

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摘要： 研究了铝酸钠溶液处理对β沸石硅铝分布及表面酸性质的影响,通过XRD,NH3-TPD,Pyridine-IR及NMR表征了经NaAlO2溶液处理后的Hβ沸石的表面酸性质.结果表明,Hβ沸石的总酸量增加,B酸量和L酸量亦增加.NaAlO2溶液处理对β沸石具有补铝功能,补铝机理为Al(OH)4-阴离子在Si(0Al)A位发生同晶取代.甲苯歧化与C9芳烃烷基转移反应的催化性能考察结果表明,NaAlO2溶液处理可以提高β沸石催化剂的芳烃转化率和(B+X)选择性.

关键词: 铝化&beta, 沸石, 同晶取代机理, 硅铝分布, 表面酸性

Abstract: The changes of surface properties of Hβ including distribution of silicon and aluminium atoms as well as surface acid properties after treatment by NaAlO2 were studied. The samples were characterized by XRD, NH3-TPD, Pyridine-IR, 29Si MAS NMR and 27Al MAS NMR. The surface properties of Hβ zeolite changed after NaAlO2 aqueous solution treatment as follows: the total acid amount increased, Bronsted acid sites and Lewis acid sites increased. NaAlO2 aqueous solution treatment of zeolite beta may has function of realumination at a Si(0Al)A site by an isomorphous substitution Al(OH)4- anions. The results of activity for disproportionation and trans-alkylation of toluene and C9 aromatics over samples with and without NaAlO2 solution treatment were also compared. The comparison results show that the sample with NaAlO2 solution treatment has a higher aromatics conversion and a higher (B+X) selectivy, which indicates that the catalytic activity of zeolite beta increase as a result of NaAlO2 solution treatment due to a change in the surface acid properties.

Key words: Aluminated &beta, zeolite, Isomorphous substitution mechanism, Distribution of silicon and aluminium, Surface acidity

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