含铝、镓层柱材料的表面酸性及催化性能

用水热法合成了含铝和镓的两种皂石,并进行交联制得不同柱高及柱含量的铝、镓层柱材料。用 XRD、NH_3-TPD、FT-IR 表征了试样的晶相、表面酸量、酸类型和酸强度,考察了试样对β-甲基萘岐化反应的催化性能。结果表明:层柱材料的晶相完整,高柱试样及交联合成土试样的酸量大,试样的 L 酸中心大于 B 酸中心。酸量越大活性越高;层柱材料催化β-甲基萘主要以异构反应为主,强的 B 酸中心和较多的 L 酸中心有利于β-甲基萘发生岐化反应。

STUDY ON SURFACE ACIDITY AND CATALYTIC PROPERTIES OF PILLARED MATERIALS WITH GALLIUM AND ALUMINUM

Two saponites with aluminum and gallium were synthesized by a hydrothermal method.A- luminum and gallium substituted pillared materials with different pillar height and contents were pre- pared by cross-linking with hydroxyl aluminum oligomer.The crystallinity,acid amount,acid intensi- ty and types of surface acid of the above samples were characterized by XRD,IR and NH_3-TPD.The catalytic properties of the samples were studied in β-methylnaphthalene(β-MN)disproportionation re- action.The results showed that pillared materials with clear crystal and different pillar height were obtained.The acid amounts of highly pillared samples and cross-linking synthetic clays were higher than others.The number of Lewis(L)acid centre was higher than that of Bronsted(B)acid.The higher the acid amounts,the higher the activity.β-MN was mainly converted into α-MN by isomeriza- tion by the acid catalysts.The strong B acid and more L acid centres are favorable for β-MN dispropo- rationation reaction.