摘要
分别采用溶胶-凝胶法和浸渍法制备了一系列Ni/SiO_2催化剂,将其用于催化偏三甲苯(1,2,4-TMB)的加氢脱烷基反应.结果表明,在制备过程中,无水柠檬酸(CA)的加入量对催化剂的结构、表面性质、粒径及催化性能均有较大影响.催化剂表面L酸位上1,2,4-TMB几乎不发生歧化和异构化反应.镍硅体系催化剂上主要副反应为苯环加氢,通过调整还原镍的粒径可有效控制苯环加氢,从而提高了二甲苯(BTX)的选择性.在最佳反应条件下,10Ni/Si-2.0催化剂上1,2,4-TMB的转化率最高为29.4%,BTX的选择性为99.9%.
A series of Ni/SiO2 catalysts,prepared via sol-gel and impregnation methods,respectively,was tested in the reaction of hydrodealkylation of 1,2,4-trimethylbenzene（1,2,4-TMB）. The results showed that the volume of citric acid anhydrous（CA） have great influence on the structure,surface properties,particle size and catalytic properties. 1,2,4-TMB hardly reacted disproportionation and isomerization reaction on Lewis acid sites. The hydrogenation of benzene ring was main adverse reaction on Ni/SiO2 catalysts. The particle size of Ni on the catalyst could be adjusted in a certain range by changing the amount of CA,and the resultant catalysts exhibited high selectivity for Benzene-Toluene-Xylene（BTX）. With the optimum reaction conditions,the highest conversion of 1,2,4-Trimethylbenzene was 29. 4% and the selectivity of BTX was 99. 9% on the10 Ni/Si-2. 0 catalyst.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2016年第12期2215-2220,共6页
Chemical Journal of Chinese Universities
基金
吉林省科技攻关计划重点科技攻关项目(批准号:20150204020GX)
吉林省科技厅自然科学基金项目(批准号:20130101015JC)资助~~
关键词
镍催化剂
溶胶-凝胶法
偏三甲苯
加氢脱烷基
Nickel catalyst
Sol-gel method
1
2
4-Ttrimethylbenzene
Hydrodealkylation
作者简介
联系人简介：王振旅，男，博士，教授，博士生导师，主要从事多相催化方面的研究．E-mail：wzl@jlu．edu．cn
