催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (11): 1131-1136.

• 研究论文 • 上一篇    下一篇

苯氨基甲酸甲酯分解催化剂 Bi-Zn 复合氧化物的制备及其催化性能

戴云生1,2, 王越1, 王庆印1, 王公应1,3   

  1. 1 中科院成都有机化学所, 四川成都 610041 2 中国科学院研究生院, 北京 100049 3 常州化学研究所, 江苏常州 213164
  • 收稿日期:2009-11-25 出版日期:2009-11-25 发布日期:2013-07-17

Preparation and Catalytic Performance of Bi-Zn Composite Oxide Catalysts for Decomposition of Methyl N-Phenyl Carbamate

DAI Yunsheng1,2, WANG Yue1, WANG Qingyin1, WANG Gongying1,3,*   

  1. 1Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China 2Graduate University of Chinese Academy of Sciences, Beijing 100049, China 3Changzhou Institute of Chemistry, Changzhou 213164, Jiangsu, China
  • Received:2009-11-25 Online:2009-11-25 Published:2013-07-17

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1078

被引次数

3

摘要： 采用共沉淀法制备了一系列 Bi-Zn 复合氧化物催化剂并将其用于催化苯氨基甲酸甲酯 (MPC) 分解制备苯基异氰酸酯 (PI). 用热重、X 射线衍射和傅里叶变换红外光谱考察了 Bi/Zn 摩尔比和焙烧温度对催化剂物相结构和表面性质的影响. 结果表明, Zn 的加入使 Bi2O3 由 α 晶相转变为活性更高的 β 晶相, 500 oC 焙烧时 Bi-Zn 前驱体分解较为完全, 析出 Bi2O3 粒子的同时伴生较多 Bi7.65Zn0.35O11.83 晶相. 在 Bi/Zn 摩尔比为 2/1, 焙烧温度为 500 oC 条件下制得的催化剂活性最高, 此时 MPC 转化率为 86.0%, PI 选择性为 91.7%, 优于单独使用 Bi2O3 时的催化性能.

关键词: 苯氨基甲酸甲酯, 苯异氰酸酯, 催化分解, 氧化铋, 氧化锌, 复合氧化物

Abstract: A series of Bi-Zn composite oxide catalysts were prepared by coprecipitation and used for the synthesis of phenyl isocyanate (PI) by catalytic decomposition of methyl N-phenyl carbamate (MPC). The effects of Bi/Zn molar ratio and calcination temperature on the phase structure and surface properties of the catalysts were investigated by X-ray diffraction, thermogravimetry, and Fourier transform infrared spectroscopy. The addition of Zn can make the crystalline of Bi2O3 change from α phase to β phase with better activity. The Bi-Zn precursor was almost completely decomposed at 500 oC to form Bi2O3 particles and more Bi7.65Zn0.35O11.83 phase. The catalyst with a Bi/Zn molar ratio of 2/1 and the calcination temperature of 500 oC exhibited the highest activity. The MPC conversion and the selectivity for PI were 86.0% and 91.7%, respectively, which was better than the activity of Bi2O3 used alone.

Key words: methyl N-phenyl carbamate, phenyl isocyanate, catalytic decomposition, bismuth oxide, zinc oxide;composite oxide