MgF_2基催化剂合成CH_2F_2的研究  

Synthesis of difluoromethane over magnesium fluoride (MgF_2) based catalyst

作　　者：胥会祥[1] 吕剑[1] 

机构地区：[1]西安近代化学研究所,陕西西安710065

出　　处：《工业催化》2002年第5期50-53,共4页Industrial Catalysis

基　　金：国家自然科学基金资助项目 (2 96 0 30 0 6 )

摘　　要：用混合法制备了一系列含Cr3+和过渡金属助剂的MgF2 基催化剂。考察了助剂对CrF3/MgF2 催化剂氟化CH2 Cl2 的催化性能 ,结果表明 ,在Cr3+/MgF2 中添加一定的Co2 +和Ni2 +能提高催化剂稳定性 ,延长使用寿命 ;Zn2 +能提高CH2 F2 的选择性 ;Fe3+和Cu2 +对Cr3+/MgF2 的活性有抑制作用。讨论了配料比、空速和温度等反应条件对催化剂性能的影响。A series of magnesium fluoride (MgF 2) based catalysts containing Cr 3+ and transition metal promoter were prepared by mixing route. The effects of promoter on the properties of CrF 3/ MgF 2 in the reaction of CH 2Cl 2 and HF were investigated. The results showed that Co 2+ and Ni 2+ added into Cr 3+ / MgF 2 catalyst can increase its stability and service life. Zn 2+ improves the selectivity to difluoromethane, while Fe 3+ and Cu 2+ inhibits activity of the catalyst. The effect of reaction temperature, HF/CH 2Cl 2 mole ratio and space velocity on the properties of CrF 3/ MgF 2 were discussed, too.

关 键 词：MGF2 CH2F2 研究 氟化催化剂 氟氯交换反应 助剂 

分 类 号：TQ222.21[化学工程—有机化工] TQ426.94