聚苯胺负载H_4PMo_(11)VO_(40)催化剂的结构和催化性能  

Structure and Catalytic Activity of Polyaniline-Supported H_4PMo_(11)VO_(40) Catalyst

作　　者：周广栋[1] 程铁欣[1] 郭晓红[1] 李文兴[1] 毕颖丽[1] 甄开吉[1] 

机构地区：[1]吉林大学化学学院,吉林长春130023

出　　处：《催化学报》2004年第3期189-193,共5页

基　　金：国家博士点专项基金资助项目 (19990 183 0 8)

摘　　要：合成了聚苯胺负载的H4PMo11VO40 催化剂 ,利用IR ,XRD ,ICP ,SEM和NH3 TPD等技术对催化剂进行了表征 ,证实H4PMo11VO40 能够负载于聚苯胺载体上 ,并有效地改善了H4PMo11VO40 的酸碱 氧化还原催化性能 .考察了催化剂催化正己醇转化的性能 ,正己醇氧化生成正己醛和脱水生成正己烯两种产物 .与未负载的H4PMo11VO40 相比 ,聚苯胺负载的H4PMo11 VO40 催化剂的氧化还原催化性能有所提高 ,而酸碱催化性能有所降低 ,并且催化性能随着H4PMo11VO40 负载量的增加而提高 .但负载量过高时 ,正己醛收率反而降低 .其中以C6H4 5N(H4PMo11VO40 ) 0 0 3 19催化剂最佳 ,14 0℃时达到最大正己醇转化率 87 6 % ,正己醛的收率为 4 8 8% ,选择性为 5 5 7% .Heteropolyacids (HPA) and their salts have been intensively studied because they can be used as excellent acidic, redox and bifunctional catalysts in heterogeneous and homogeneous catalytic reactions. In this paper, polyaniline (PAN)-supported H 4PMo 11VO 40 catalyst was prepared by a two-step method. Results of IR, XRD, ICP, SEM and NH 3-TPD proved that H 4PMo 11VO 40 could be supported on PAN. The catalyst was used for hexanol conversion, which produced hexanal and hexene depending on the reaction conditions. The supported H 4PMo 11VO 40 catalyst exhibited higher redox activity but lower acid-base activity compared with the unsupported H 4PMo 11VO 40. The maximum conversion of hexanol over C 6H 4.5N(H 4PMo 11VO 40) 0.0319 was 87.6%, while the selectivity and yield of hexanal were 55.7% and 48.8% respectively at 140 ℃. Due to protonation, a part of the acidic centers of the PAN-supported HPA were effectively inhibited, which led to high redox activity and was favorable for hexanol conversion to hexanal. Redox activity of the supported catalyst increased with the increase of surface H 4PMo 11VO 40 concentration.

关 键 词：聚苯胺 磷 钼 钒 杂多酸 正己醇 正己醛 

分 类 号：O643.3[理学—物理化学]