La-HZSM-5催化乙醇脱水制乙烯  

Dehydration of Ethanol to Ethylene over La-HZSM-5 Catalyst

作　　者：苏国东[1] 黄和[1] 成源海[1] 胡耀池[1] 胡燚[1,2] 

机构地区：[1]南京工业大学材料化学工程国家重点实验室,江苏南京210009 [2]南京大学化学化工学院,江苏南京210093

出　　处：《化学反应工程与工艺》2009年第1期46-51,共6页Chemical Reaction Engineering and Technology

基　　金：国家高技术研究发展计划(2006AA020101);国家科技支撑计划重点资助项目(2006BAE02B04);江苏省博士后科研资助计划项目(0701030B)

摘　　要：以HZSM-5分子筛改性得到的3%La-HZSM-5分子筛为催化剂,在小型的固定床反应器中(Φ45 mm×600 mm)考察了乙醇浓度、反应温度和液时空速对乙醇脱水制乙烯反应的影响。采用X射线衍射(XRD)、NH_3程序升温脱附(NH_3-TPD)、N_2吸附-脱附和热重-差示扫描量热仪(TG-DSC)等手段对3%La-HZSM-5分子筛反应前后催化剂的物性变化进行分析,并考察了催化剂的稳定性。结果表明,该催化剂对乙醇脱水反应具有良好的催化性能,较好的再生性能、强度和稳定性。乙醇脱水反应的合适反应条件为催化剂180 g,乙醇质量浓度50%,液时空速1.1 h^(-1),反应温度260℃。在此条件下,乙醇转化率和乙烯选择性均高于98%,催化剂单程使用寿命达900 h。The effects of ethanol concentration, temperature and liquid hourly space velocity （LHSV） on dehydration of ethanol to ethylene over 3MLa-HZSM-5 molecular seive catalyst （loading La mass fraction 3%） were investigated in a fixed bed （φ45 mm× 600 mm）. The catalysts were characterized by X-ray diffraction （XRD）, NH3 temperature programmed desorption （NH3-TPD）, N2 adsorption-desorption and thermogravimetric-differential scanning calorimeter （TG-DSC） and particle strength tests. And the stability of the catalysts were investigated. The results showed that the catalyst exhibited good catalytic performance for ethanol dehydration, good regeneration ability, good strength and stability. Ethanol conversion and ethylene selectivity were both above 98% under the conditions of ethanol mass concentration 50M, LHSV 1. 1 h^-1 and 260℃. The single pass lifetime of the catalyst was up to 900 h.

关 键 词：HZSM-5分子筛 乙醇脱水 乙烯 

分 类 号：TQ032.41[化学工程]