摘要
研究了β沸石在不同焙烧温度和加入粘合剂条件下对丙烯与异丙醇合成异丙醚的催化性能。并通过ＸＲＤ、ＸＰＳ、ＮＨ３－ＴＰＤ、ＦＴ－ＩＲ及化学吸附等手段表征了β沸石的物理化学性质。结果表明：焙烧对丙烯醚化反应存在一合适的温度范围；Ａｌ２Ｏ３粘合剂提高了丙烯转化率，降低了异丙醇脱水活性；粘合剂使沸石表面上Ｌ酸中心的比例增加；丙烯醚化反应与Ｌ酸中心存在较好的对应关系，而异丙醇脱水反应与Ｂ酸中心对应；高温焙烧β沸石使骨架铝向表面迁移，粘合剂Ａｌ２Ｏ３能抑制沸石的晶胞收缩。
The effect of calcination temperature and Al2O3 adhesive agent on the surface acidity of Hβzeolites and the etherification performance of propylene with isopropyl alcohol to form isopropyl ether wasstudied by XRD,XPS,NH3-TPD,FT-IR and chemisorption.The activity of propylene etherification was greatly influenced by calcination temperature and showed an optimum calcination temperature.It has been demonstrated that propylene etherification depended on the L acid sites and isopropyl alcohol dehydration on the B acid sites.The Al2O3additive which enhances the L acid amount increased propylene conversion and decreased isopropyl alcohol dehydration.A high calcination temperature led a mobility of skeleton Al to the surface.In addition,Al2O3 was helpful to avoid shriking of theβzeolite cell.
出处
《分子催化》
EI
CAS
CSCD
1996年第1期6-12,共7页
Journal of Molecular Catalysis(China)
基金
国家自然科学基金
中国博士后科学基金
关键词
丙烯
异丙醚
Β沸石
醚化反应
催化性能
Propylene etherification,βzeolite,Isopropyl ether,Adhesive agent,Surface acidity
