Ni/SiO_(2)催化剂催化2-甲基呋喃加氢性能  

Catalytic performance of Ni/SiO_(2)for 2-methylfuran hydrogenation

作　　者：方姿予 张炜 王金鼎 种思颖 张雅静 王康军 FANG Ziyu;ZHANG Wei;WANG Jinding;CHONG Siying;ZHANG Yajing;WANG Kangjun(College of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning,China)

机构地区：[1]沈阳化工大学化学工程学院,辽宁沈阳110142

出　　处：《精细化工》2024年第5期1060-1066,1075,共8页Fine Chemicals

基　　金：辽宁省高等学校创新人才支持计划项目(辽教函[2020]389号);辽宁省兴辽英才计划项目(XLYC1907029);沈阳市中青年科技创新人才支持计划项目(RC210365)。

摘　　要：以硝酸镍为镍源、酸/碱性硅溶胶为硅源,采用共沉淀法制备了2种Ni/SiO_(2)催化剂。采用固定床反应器,评价Ni/SiO_(2)催化剂对于2-甲基呋喃(2-MF)气相加氢合成2-甲基四氢呋喃(2-MTHF)的反应性能。通过XRD、N_(2)等温吸附-脱附、H_(2)-TPR、NH3-TPD、XPS、FTIR和TEM对催化剂进行了表征。考察了硅溶胶的酸碱性对Ni/SiO_(2)催化剂结构及性能的影响。结果表明,以酸性硅溶胶为硅源制备的Ni/SiO_(2)催化剂以弱酸中心酸量为主且存在中强酸中心,比表面积、平均孔径大,因而该催化剂加氢活性和2-MTHF的选择性较高。Ni/SiO_(2)催化剂稳定性良好,在最优反应条件〔温度90℃、H_(2)压力2 MPa、质量空速4.4 g 2-MF/(g催化剂·h)、H_(2)与2-MF物质的量之比为4∶1〕下进行催化剂稳定性测试(200 h),2-MF的转化率达到99.8%,2-MTHF的选择性均保持在97.5%左右。Ni/SiO_(2)catalyst was prepared from coprecipitation of nickel nitrate and acid/alkaline silica sol,haracterized by XRD,N_(2)isothermal adsorption and desorption,hydrogen temperature-programmed reduction(H_(2)-TPR),temperature-programmed desorption of ammonia(NH3-TPD),XPS,FTIR and TEM,and evaluated for its catalytic performance for 2-methylfuran(2-MF)gas phase hydrogenation to 2-methyltetrahydrofuran(2-MTHF)in a fixed bed reactor.The effect of acidity and alkalinity of silica sol on the structure and performance of the catalyst was also investigated.The results showed that the Ni/SiO_(2)catalyst prepared with acidic silica sol possessed more amount of weak acid sites and medium strong acid sites,larger specific surface area and average pore size,which was beneficial for the improvement of catalyst activity and 2-MTHF selectivity.Moreover,Ni/SiO_(2)catalyst exhibited good stability.Under the conditions of reaction temperature 90℃,hydrogen pressure 2 MPa,mass hourly space velocity 4.4 g 2-MF/(gcat·h),molar ratio value of H_(2)to 2-MF of 4∶1 and reaction time 200 h,the conversion of 2-MF reached 99.8%,and the selectivity of 2-MTHF remained about 97.5%.

关 键 词：2-甲基四氢呋喃 2-甲基呋喃 共沉淀法 Ni/SiO_(2) 酸碱性 催化技术 

分 类 号：TQ426[化学工程]