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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

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

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【作者】 戴云生王越王庆印王公应

【Author】 DAI Yunsheng1,2, WANG Yue1, WANG Qingyin1, WANG Gongying1,3, 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

【机构】 中科院成都有机化学所中国科学院研究生院常州化学研究所

【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,500oC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500oC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.

【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.

【基金】 国家“十一五”科技支撑计划重大项目(2006BAC02A08)
  • 【文献出处】 催化学报 ,Chinese Journal of Catalysis , 编辑部邮箱 ,2009年11期
  • 【分类号】O643.32
  • 【被引频次】2
  • 【下载频次】152
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