摘要
借助微波技术制备出一系列具有不同Ｌａ（３＋）交换度的ＬａＨＺＳＭ－５样品．初步探讨了微波强度、微波作用时间及Ｓｉ／Ａｌ比对交换度的影响．对其表面酸性的考察发现，样品均含有Ｂ酸和Ｌ酸中心，并且随Ｌａ（３＋）进入ＺＳＭ－５沸石的量的不同，强弱酸中心的强度与数量均有所改变．对样品催化性能的研究结果表明，催化活性与Ｌａ^（３＋）含量及酸量呈顺变关系．
A series of LaHZSM-5 samples with different La3+ exchange degrees were prePared by microwave technique. The effects of microwave power,exchang time and Si/Al ratio on La￣(3+)exchange degree have been investigated.found that Bronsted and Lewis acid sites are present on the surfaces of samples. The strength and amount of the strong and weak acid sites are changed with different amount of La3+ added into ZSM-5 zeolites,The studies on catalytic properties show that the cracking activity is correlation to the amount of La3+ in samples.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第12期1914-1917,共4页
Chemical Journal of Chinese Universities
基金
国家稀土化学与物理开放实验室资助
关键词
分子筛
微波技术
沸石
裂解反应
稀土离子
La￣(3+)-exchanged ZSM-5 zeolite,Microwave technique,Surface acidity,Cracking reaction
