V-P/HZSM-5催化乙醇流化床脱水制乙烯  

Synthesis of ethylene via ethanol dehydration in fluidized bed over V-P/HZSM-5 catalyst

作　　者：洪爱珠[1] 颜桂炀[1] 刘欣萍[1] 肖荔人[1] 陈庆华[1] 

机构地区：[1]福建师范大学化学与材料学院福建省改性塑料技术开发基地,福建福州350007

出　　处：《工业催化》2008年第4期49-54,共6页Industrial Catalysis

基　　金：国家科技支撑计划(2006BAE03B06);教育部"新世纪优秀人才支持计划"(NCET-04-0614)

摘　　要：分别采用P、V和V-P改性HZSM-5,在自行设计的流化床装置上评价其对乙醇脱水制乙烯的催化性能。采用X射线荧光光谱(XRF)、X射线粉末衍射(XRD)、吡啶吸附红外光谱(Py-IR)、比表面积分析(BET)和X射线光电子能谱(XPS)等手段对催化剂的物化性能进行表征,同时考察了不同催化剂制备条件和催化反应条件等工艺因素对催化剂性能的影响。结果表明,V-P复合改性HZSM-5比P和V单独改性的催化效果好,在P和V原子比为7.5、焙烧温度300℃、反应温度220℃、乙醇进样流速0.1 mL.min-1和催化剂用量3.0 g条件下,乙醇的转化率和乙烯的选择性分别高达96.9%和93.5%,具有稳定的初期活性。同时,该催化剂对低浓度乙醇的脱水反应表现出较佳的催化活性。HZSM-5 zeolite samples were separately modified by phosphorus, vanadium, and vanadiumphosphorus and their catalytic activity was tested for ethanol dehydration to ethylene in a fluidized bed reactor. The catalysts were characterized by XRF,XRD, Py-IR and BET. The effects of catalyst preparation and dehydration reaction condition on the catalytic behaviors were investigated. The results showed that activity of the catalysts modified by vanadium-phosphate was superior to those modified by solely P or V. Ethanol conversion of 96.9% and selectivity to ethylene of 93.5% was attained under the following condition ： P/V atomic ratio 7.5, calcination temperature 300℃, reaction temperature 220 ℃, ethanol flow rate 0.1 mL·min-1, catalyst dosage 3g. The catalyst exhibited stable initial-term activity. The catalyst exhibited even better catalytic results for dehydration of low concentration ethanol.

关 键 词：有机化学工程 HZSM-5 V-P复合改性 流化床 乙醇脱水 乙烯 

分 类 号：TQ426.951[化学工程] TQ221.211