FCC催化剂基质组分直链烯烃反应研究  

Reaction Research of Straight Chain Olefin Hydrocarbons over FCC Catalyst Matrixes

作　　者：王伟 刘锋利 王玉 徐慧[2] 

机构地区：[1]南阳石蜡精细化工厂,河南南阳473132 [2]河南油田通讯公司,河南南阳473132

出　　处：《河南化工》2004年第12期10-13,共4页Henan Chemical Industry

基　　金：国家重点基础研究发展规划项目 (G2 0 0 0 0 480 0 1)

摘　　要：制备了一系列SiO2 -Al2 O3 基质材料 ,采用吡啶吸附—红外光谱法对其酸性特征进行了表征。并且以n -C=7- 1为模型化合物考察了反应产物分布与基质材料酸中心特性的关联 ,提出了n -C=7- 1的裂化反应网络 ,对n -C=7- 1的异构化、氢转移、芳构化等二次反应进行了探讨。结果表明 ,异构化反应过程同时以单分子与双分子两种机理进行 ,但双分子反应选择性较低 ;氢转移反应不仅与基质的酸中心密度有关 ,对酸类型的影响更为敏感 ,在只有L酸的基质上 ,氢转移以Rideal机理进行 ,活性随酸密度呈线性增加 ;在既有B酸又有L酸的基质上 ,氢转移更倾向于L -H机理 ,活性随酸密度呈指数增加 ;A series of SiO_2-Al_2O_3 matrixes are prepared by sol-gel method. The structure characterization and acid site measurement of the matrixes are carried out by XRD, BET and IR. Heptene-1 is used as the model compound for the determination of relationship between product distribution and surface acid sites. A network of cracking reaction of n-C~=_7 -1 is mentioned. The reaction mechanism of secondary reaction of isomerization, hydrogen transfer and aromatization of n-C~=_7-1 is studied. It is found out that, skeletal isomerization of heptene-1 proceeds via both monomolecular and bimolecular mechanism but the selectivity of bimolecular isomerization is lower. The reaction of hydrogen transfer is related not only to the density of acidic center of the matrixes but also is more sensitive to the type of acidic site of the matrixes. The hydrogen transfer reaction proceeds by Rideal mechanism when matrixes is only Lewis acid, however, when matrixes is not only Lewis acid but also Bronsted acid,hydrogen transfer inclines to proceed by L-H mechanism. In comparison with the Lewis acid, Bronsted acid sites are more favorable to improve the selectivity of the cracking, the hydrogen transfer and the aromatization . On the other hand, Lewis acid sites can effectively increase the selectivity of isomerization.

关 键 词：SIO2-AL2O3 烯烃 正碳离子 酸性 

分 类 号：TE624.41[石油与天然气工程—油气加工工程]