FeO_x/MgF_2催化剂气相催化1,1,1,3,3-五氟丙烷脱HF反应  

FeO_x/MgF_2 catalysts for gas-phase dehydrofluorination of 1,1,1,3,3-pentafluoropropane

作　　者：宋建冬 王会杰[1] 汪云 鲁继青[1] 罗孟飞[1] Song Jiandong;Wang Huiji;Wang Yun;Lu Jiqing;Luo Mengfei(Institute of Physical Chemistry,Zhejiang Normal University,Jinhua321004,Zhejiang,China)

机构地区：[1]浙江师范大学物理化学研究所,浙江金华321004

出　　处：《工业催化》2017年第11期22-27,共6页Industrial Catalysis

基　　金：国家自然科学基金(21373186)资助项目

摘　　要：采用浸渍法制备不同Fe负载量的FeO_x/MgF_2催化剂,考察FeO_x/MgF_2催化剂气相催化1,1,1,3,3-五氟丙烷脱HF反应的催化性能。结果表明,催化剂整体活性顺序为3FeO_x/MgF_2>6FeO_x/MgF_2>1FeO_x/MgF_2>MgF_2,负载Fe物质的量分数为3%时,1,1,1,3,3-五氟丙烷转化率最高,达到80.8%。结合表征结果可以得出,催化剂表面酸性与Fe负载量关系密切。3FeO_x/MgF_2催化剂由于表面铁物种能够较好地分散在载体表面,与载体作用表现出较高的表面酸性,具有最好的催化活性。经过100 h稳定性测试,3FeO_x/MgF_2催化剂表面积炭不影响催化剂催化活性。催化剂催化活性提高可能是在反应过程中FeO_x与反应产物HF反应生成活性更高的FeO_xFy物种所致。Supported FeOx/MgF2catalysts with different Fe contents were prepared by an impregnation method and tested for the gas phase dehydrofluorination of1,1,1,3,3-pentafluoropropane(HFC-245fa).The results showed that the overall activities of the catalysts followed the order of3FeOx/MgF2>6FeOx/MgF2>1FeOx/MgF2>MgF2,and the highest HFC-245fa conversion80.8%was obtained on the3FeOx/MgF2at340℃.The NH3-TPD results indicated that the surface acidity of the catalyst was closely related to the amount of Fe loading The high surface acidity on the3FeOx/MgF2was due to the highly dispersed FeOx species strongly interacting with the MgF2support Meanwhile,the carbon deposited on the surface of3FeOx/MgF2catalyst did not affect the catalyst stability,which showed long-term stability in100h reaction The enhanced activities on the FeOx/MgF2catalysts were probably due to the formation of some active FeOxFy species through the reaction between FeOx and HF

关 键 词：催化化学 FeOx/MgF2催化剂 1 1 1 3 3-五氟丙烷 脱氟化氢 HFO-1234ze 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]