高比表面积Cr_2O_3的制备和气相氟化HCFC-133a合成HFC-134a的性能研究  

Preparation of the High Surface Area Cr_2O_3 Catalyst and Study on Property of the Fluorination of HCFC-133a to Synthesize HFC-134a over Cr_2O_3 Catalyst

作　　者：于洪波[1] 谢遵运[1] 王月娟[1] 罗孟飞[1] 

机构地区：[1]浙江师范大学物理化学研究所先进催化材料教育部重点实验室,浙江金华321004

出　　处：《有机氟工业》2012年第2期18-22,共5页Organo-Fluorine Industry

摘　　要：采用改进溶胶凝胶法合成了高比表面积的Cr2O3催化剂,通过优化实验条件发现,当碳化温度为500℃时,蔗糖与铬摩尔比为2∶1,除碳温度为400℃时,制得的Cr2O3比表面积最大(61 m2.g-1)。合成的高比表面积Cr2O3催化剂气相氟化CF3CH2Cl合成CF3CH2F的催化活性明显高于直接制备的低比表面积Cr2O3催化剂,这归因于高比表面积Cr2O3催化剂具有更多路易斯酸性位。A high surface area Cr2O3 catalyst was prepared by using a modified sol -gel method. It was found that the optimal conditions for the synthesized of the highest surface area Cr2O3 （m^2·g^-1） are as follows： The temperatures for carbon calcination and carbon removal are 500 ℃ and 400 ℃ respectively, and the molar ratio of sucrose and chromium ion is 1：4. In addition, the high surface area Cr2O3 catalyst was more active for the fluorination of CF3 CH2 C1 to synthesize CF3 CH2 F than the catalyst prepared by a direct synthesis, due to its higher amount of acid sites.

关 键 词：高比表面积 CR2O3 改进溶胶凝胶法 碳化温度 CF3CH2Cl 

分 类 号：TQ222[化学工程—有机化工]