摘要
在固定床反应器中考察了USY(超稳Y分子筛)和过渡金属改性USY催化低浓度乙醇脱水制乙烯反应,并通过BET,XRD和NH3-TPD等手段对改性前后的催化剂进行表征.结果表明,Co/USY的催化反应性能较好.当硝酸钴浸渍液质量分数为3%时,催化反应效果最好,乙醇转化率达到93.2%,乙烯选择性达到95.7%.Co/USY催化低浓度乙醇脱水制乙烯反应中乙烯的选择性对反应温度敏感,乙烯选择性由220℃的24.0%骤然提高到250℃的95.7%,在280℃时乙烯选择性达到100%.并且考察了Co/USY的初期稳定性,发现在反应102 h后催化剂仍具有良好的活性.
USY and transition metal modified USY （M/USY） were used as catalyst to investigate the dehydration of low concentration ethanol to ethylene. The physical and chemical properties of the catalysts were characterized by nitrogen adsorption-desorption （BET）, X-ray powder diffraction （XRD） and ammonium temperature-programmed desorption （NH3-TPD） techniques. The catalytic performance reached the best value when the cobalt concentration as 3 % at ethanol concentration of 20% （percent of volume）, reaction temperature at 250℃ and the weight hourly space velocity （WHSV） of 2.37 h 1. Temperature of reaction had a significant impact on the ethylene selectivity,and which increased from 24.0% of 220 ℃ to 95.7% of 250℃. When temperature is 280℃, the ethylene selectivity is up to 100%. The catalyst Co/USY has fine stablility and high activity after reacting 102 h.
出处
《煤炭转化》
CAS
CSCD
北大核心
2011年第2期82-85,90,共5页
Coal Conversion
基金
国家科技支撑计划项目(2007BAB24B04)
关键词
低浓度乙醇
乙烯
USY
过渡金属
low concentration ethanol,ethylene,USY,transition metals
