尿素燃烧法Co-Mo/Al_2O_3-TiO_2催化剂的加氢脱硫性能  

Hydrodesulfurization Performance of Co-Mo/Al_2O_3-TiO_2 Catalyst Prepared by Urea Matrix Combustion Method

作　　者：焦冬梅[1,2] 韩林芯[1] 吴立报[1] 曹发海[1] 

机构地区：[1]华东理工大学化工学院,上海200237 [2]中国石化洛阳分公司,河南洛阳471012

出　　处：《石油化工》2011年第6期603-607,共5页Petrochemical Technology

摘　　要：以尿素燃烧法制备了Co—Mo／Al2O3-TiO2催化剂，采用低温N2吸附、HRTEM、XPS等方法对催化剂的表面结构和电子状态进行了表征，在微型固定床反应器上对Co—Mo／Al2O3-TiO2催化剂的活性进行了评价。考察了尿素添加量、TiO2添加量、n（Co）：n（Mo）、反应温度和液态空速（LHSV）等对催化剂结构和加氢脱硫活性的影响。实验结果表明，采用H（尿素）：n（Co＋Mo）=10．0时制备的Co—Mo／Al2O3-TiO2催化剂表面负载的金属组分密度大，孔径大，对二苯并噻吩的脱除率达94％以上；添加TiO2降低了Mo与载体的相互作用；在Al2O3-TiO2载体中TiO2的质量分数为20％，n（Co）：n（Mo）=0．35～0．55、反应温度300～380℃、LHSV=3—6h^-1的条件下，Co—Mo／Al2O3-TiO2催化剂的加氢脱硫活性最好。Co-Mo/Al2O3-TiO2 catalysts for deep hydrodesulfurization （HDS） were prepared by urea matrix combustion method （UMxC） and characterized by means of N2 physisorption, HRTEM and XPS. Activities of the catalysts in HDS were investigated in a stainless tubular fix-bed reactor with thiophene, benzothiophene and dibenzothiophene as the model compounds. Effects of urea dosage, TiO2 dosage, n （Co） ： n （Mo）, reaction temperature and LHSV on the catalyst structures and their HDS catalytic activity were studied. The results showed that the UMxC method could lead to bigger pore size and more metal component deposition on the catalyst surface, which benefited removal of big molecular dibenzothiophene. The optimal conditions for HDS were obtained as following： TiO2 content（w） in Al2O3-TiO2 support 20%, n （Co） ： n （Mo）in the catalyst 0.35 -0.55, HDS temperature 300 - 380 ℃ and LHSV 3 -6 h^-1.

关 键 词：加氢脱硫 尿素燃烧法 钴-钼催化剂 二苯并噻吩 复合载体 

分 类 号：TQ426.6[化学工程]