摘要
采用溶胶-凝胶法制备了Co-M/Al2O3(M=Cu,Zn,Ni)催化剂。在没有任何有机溶剂或助剂的条件下,研究了以空气为氧化剂的环己烷选择性氧化。所制备四种催化剂的活性为Co-Ni/Al2O3>Co/Al2O3>Co-Zn/Al2O3>Co-Cu/Al2O3。在Co-Ni/Al2O3中Co、Ni的质量分数分别为4.0%和3.0%时活性最好。以Co-Ni/Al2O3为催化剂,在4.5MPa4、43K下反应120min,环己烷转化率达9.9%,环己酮和环己醇的总选择性达94.6%,n(酮)∶n(醇)为2.8。Co-Ni/Al2O3催化剂连续使用五次后活性基本不变。
Selective oxidation of cyclohexane to cyclohexanol and cyclohexanone with air was investigated over Co/Al_2O_3 and Co-M/Al_2O_3 (M=Cu, Zn and Ni) catalysts prepared by sol-gel method, without assistance of any organic solvent or activator. Activity of the catalysts declines in the following order: Co-Ni/Al_2O_3 >Co/Al_2O_3 >Co-Zn/Al_2O_3 >Co-Cu/Al_2O_3. Optimum activity was attained at cobalt and nickel loading of 4.0 wt% and 3.0 wt%, respectively, in Co-Ni/Al_2O_3 catalyst. Cyclohexane conversion of 9.9%, selectivity to cyclohexanone and cyclohexanol of 94.6% and cyclohexanone-to-cyclohexanol ratio of 2.8 were obtained over the Co-Ni/Al_2O_3 catalyst at 443 K, 4.5 MPa and reaction time of 120 min. Activity of the catalyst remained unchanged after five times of repeated use.
出处
《工业催化》
CAS
2005年第7期12-15,共4页
Industrial Catalysis
基金
国家自然科学基金项目(20476042)
辽宁省科学基金项目(2001101068和002076)
