摘要
对常温和高温条件下的磷改性β分子筛进行热重、核磁共振和酸性分析,并考察其在苯与乙烯烷基化反应中的反应性能。结果表明:β分子筛高温条件下引入铵根离子后,其DTG曲线在220~230℃之间有一明显的失重峰出现,即铵根离子进入分子筛内部;其^(31)P MAS NMR和^(27)Al MAS NMR表征中在化学位移为-30.908和41.392处均有一强吸收峰,即β分子筛的骨架结构中有P(4Al)和Al(4P)四配位结构出现;其NH_3-TPD酸性增强,酸量增加。评价结果表明β分子筛高温条件下引入铵根离子后,其烷基化反应性能明显提高。
The zeolite beta modified by phosphorus at normal and high temperature was characterized by thermogravimetric,NMR and acid analysis, and their alkylation performance for benzene with propylene was investigated. The analysis shows that after introduction of ammonium ion into zeolite beta at high temperature,an obvious peak appears at 220-230℃ in DTG curve,indicating the ammonium ions coming into the zeolite; and ^31P MAS NMR and ^27Al MAS NMR of zeolite shows two strong peaks at chemical shift of -30. 908 and 41. 392, demonstrating the formation of tetracoordinated structure of P （4Al）and AI（4P） ; The modification leads more acid sites and stranger acid,proved by NH3-TPD analysis. The alkylation performance is improved significantly after modification of the zeolite at high temperature.
作者
晁会霞
罗祥生
张凤美
Chao Huixia Luo Xiangsheng Zhang Fengmei(Qinzhou University, Qinzhou, Guangzi 535000 SINOPEC Research Institute of Petroleum Processing)
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2017年第4期83-86,共4页
Petroleum Processing and Petrochemicals
关键词
磷改性
磷酸二氢铵
Β分子筛
烷基化
phosphorus modification
ammonium dihydrogen phosphate
zeolite beta
alkyIation
