HPW改性HZSM-5催化乙醇流化床脱水制乙烯  

Investigation on ethylene preparation with ethanol dehydration catalyzed by HPW/HZSM-5 in fluid bed

作　　者：刘可慰[1,2] 刘欣萍[2] 颜桂炀[2] 钱庆荣[2] 陈庆华[2] 

机构地区：[1]泉州师范学院化学与生命科学学院,福建泉州362000 [2]福建师范大学环境科学与工程学院,福州350007

出　　处：《华中师范大学学报（自然科学版）》2013年第3期371-375,共5页Journal of Central China Normal University：Natural Sciences

基　　金：福建省发改委关键技术研究项目(闽发改高技[2011]352号);泉州师范学院校级自选项目(2012KJ14)

摘　　要：采用HPW浸渍改性HZSM-5分子筛,将其应用于催化乙醇流化床脱水制乙烯反应,探讨工艺条件对催化性能的影响.实验结果表明:HPW浸渍浓度为0.04mol/L,浸渍时间为24h,焙烧温度为350℃,焙烧时间为4h时所得催化剂催化乙醇脱水制乙烯性能最佳,此时乙醇转化率和乙烯选择性可以分别达到98.1%和97.1%.采用XRD、NH3-TPD、XPS等手段对催化剂结构进行表征,结果表明HPW的"假液相"行为和适量的二级结构能够协同催化反应,催化剂的酸中心强度和酸量大小决定了催化剂的活性.The HPW/HZSM-5 catalyst was prepared by impregnation method using HZSM-5 as carrier. Its catalytic activity was examined on dehydration of ethanol in a self-designed fluidized bed reactor to manufacture ethylene. The effects of dehydration conditions on catalytic behaviors were investigated. The results show that the HPW/ HZSM-5 catalyst demonstrated good activity for ethanol dehydration. The ethanol con- version and ethylene selectivity reach 98.1% and 97.1% under the following conditions： a impregnation concentration of 0.04 mol/L, a impregnation time of 24 h, a calcination temperature of 350℃, a calcination time of 4 h. The catalysts were characterized by XRD,NH3-TPD,XPS. Characterization revealed that the ＂pseudoliquid phase＂ behavior of HPW and a proper amount of secondary structure can catalyst reaction collaborative- ly. The catalytic activity is determined by acidity strength and quantity.

关 键 词：乙醇 乙烯 催化剂 磷钨酸 HZSM-5 

分 类 号：O643.38[理学—物理化学]