高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (8): 1492.

• 研究论文 • 上一篇    下一篇

AlPxO催化剂的制备、表征及其在邻苯二酚O-单醚化反应中的催化性能

刘钢, 李雪梅, 朱小梅, 贾明君, 吴淑杰, 张文祥, 蒋大振   

  1. 吉林大学化学学院, 长春130023
  • 收稿日期:2004-09-09 出版日期:2005-08-10 发布日期:2005-08-10
  • 通讯作者: 张文祥(1962年出生),男,博士,教授,博士生导师,从事多相催化研究.E-mail:zhwenx@jlu.edu.cn E-mail:zhwenx@jlu.edu.cn
  • 基金资助:

    吉林省科技发展计划项目(批准号:990546);吉林大学创新基金(批准号:2002CX092);教育部博士学科点基金(批准号:20040183003);中国石油天然气集团公司(合同号:JTGS20040010)资助.

Preparation and Characterization of AlPxO Catalysts and Their Catalytic Properties for the Vapour-phase O-Methylation of Catechol

LIU Gang, LI Xue-Mei, ZHU Xiao-Mei, JIA Ming-Jun, WU Shu-Jie, ZHANG Wen-Xiang, JIANG Da-Zhen   

  1. College of Chemistry, Jilin University, Changchun 130023, China
  • Received:2004-09-09 Online:2005-08-10 Published:2005-08-10

摘要: 采用沉淀法制备了AlPxO(x=0,0.33,0.5,1.0,1.5,2.0)催化剂,通过XRD,FTIR,固体核磁共振,BET,NH3-TPD和CO2-TPD等手段对催化剂进行了表征,发现n(P)/n(Al)对催化剂结构及表面酸碱性质有很大影响.考察了AlPxO催化剂上以邻苯二酚和甲醇为原料,采用气相法一步合成愈创木酚的反应性能,并研究了催化剂表面酸碱性质对反应活性和选择性的影响.结果表明,催化剂表面同时存在一定量的弱酸和弱碱中心有利于提高愈创木酚的收率.

关键词: 磷酸铝, 邻苯二酚, 愈创木酚, 弱酸弱碱

Abstract: AlPxO(x=0, 0.33, 0.5, 1.0, 1.5, 2.0) catalysts were prepared via precipitation method and characterized by means of XRD, FTIR, solid-state MAS NMR, N2 adsorption, NH-3-TPD and CO-2-TPD techniques. The morphology of the catalysts changes from amorphism to crystalline with the increase of n(P)/n(Al). Both the acidic and basic amounts on the catalysts surface increase first with the increase of P contents [n(P)/n(Al)≤0.5], and then decrease dramatically with further increasing P contents. Meanwhile, vapor-phase O-methylation of catechol with methanol was investigated over various AlPxO catalysts. Among them, AlP1.0O sample exhibits a good {catalytic} activity and selectivity to guaiacol, which resulted in the highest yield of guaiacol. This may mainly be attributed to the presence of suitable amounts of weak acid and base sites on the surface of the catalyst.

Key words: Aluminophosphates, Catechol, Guaiacol, Weak acid and base sites

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