Al_(2)O_(3)基尖晶石相催化剂的合成及其在苯酚烷基化中的应用研究  

Synthesis of Al_(2)O_(3)-based spinel catalysts and their applications in phenol alkylation

作　　者：张凡 白杨 罗小林 胡月桥 冯国栋 王伟 ZHANG Fan;BAI Yang;LUO Xiao-lin;HU Yue-qiao;FENG Guo-dong;WANG Wei(College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, Shaanxi, China)

机构地区：[1]宝鸡文理学院化学化工学院,陕西宝鸡721013

出　　处：《宝鸡文理学院学报（自然科学版）》2021年第4期50-55,共6页Journal of Baoji University of Arts and Sciences(Natural Science Edition)

基　　金：陕西省自然科学研究计划项目(2019JLM-15)。

摘　　要：目的研究浸渍法制备氧化铝基尖晶石相催化剂及其催化性能,探讨尖晶石相结构对催化剂性能的影响。方法以氧化铝与硝酸盐为原料,采用浸渍法制备具有尖晶石相的负载型γ-Al_(2)O_(3)基催化剂,以苯酚的烷基化反应为探针反应,采用相关技术对催化剂进行表征分析,关联催化剂的活性数据,探讨尖晶石相结构对载体表面性质的影响规律。结果在实验条件下Ni,Cu,Co可与γ-Al_(2)O_(3)形成尖晶石相结构,且具有高的苯酚转化率和苯环烷基化产物选择性,而未生成尖晶石相结构的催化剂(Fe,La,Ce)具有低的苯酚转化率和高的酚羟基烷基化产物选择性。结论尖晶石相的生成可提高γ-Al_(2)O_(3)的平均孔径与孔容,抑制其比表面积的降低,增强其酸性位、强碱性位的密度,降低载体的弱碱性位密度。Purposes—To evaluate the catalytic properties of alumina-based spinel catalysts which were prepared with impregnation method,and also to investigate the effect of spinel phases on the performance of catalysts.Methods—Takingγ-Al_(2)O_(3)and nitrate as raw materials,supportedγ-Al_(2)O_(3)-based catalysts with spinel phase were prepared with impregnation method,and were applied to the alkylation of phenol.Then the effects of spinel on the surface properties of catalysts were investigated by both physical and chemical adsorption techniques together with the activity of catalysts.Result—In this experiment,Ni,Cu and Co formed spinel phase withγ-Al_(2)O_(3),but Fe,La and Ce didn't.It was observed that catalysts with spinel phase improved the phenol conversion and the selectivity of benzene cycloalkylation products,while catalysts without spinel phase showed low phenol conversion and high selectivity of phenolic hydroxyalkylation products.Conclusion—The formation of spinel phase can increase the average pore size and pore volume ofγ-Al_(2)O_(3),inhibit the decrease of the specific surface area of the catalysts,increase the density of the acidic and strongly alkaline sites,and decrease the weak alkaline site density of the catalysts.

关 键 词：尖晶石 氧化铝 浸渍法 苯酚 

分 类 号：O611.62[理学—无机化学]