摘要
采用共沉淀法制备了具有协同稳定作用的Ni/La_2O_2CO_3催化剂,用于山梨醇选择性氢解为小分子醇的研究。采用X射线衍射、氢气程序升温还原、CO_2程序升温脱附和扫描电镜对催化剂进行了表征。考察了不同配比Ni、La的加氢位点和碱性调控对山梨醇氢解产物的影响。结果表明,Ni、La摩尔比为2:3时,山梨醇转化率达到98.6%,C_2~C_3多元醇的产率达到43.8%,催化剂经2次反应后对山梨醇的转化率仍高达90%。探究了催化剂从酸性到碱性调变过程中,山梨醇氢解的产物分布,并提出了反应路径。
Ni/La2O2CO3 catalysts with different Ni/La ratios were prepared by co-precipitation and the performance was tested in selective hydrogenolysis of sorbitol to C2--C3 polyols. The catalysts were characterized by X-ray diffraction（XRD）, H2 temperature-programmed reduction（H2-TPR）, CO2 temperature-programmed desorption（CO2-TPD） and scanning electron microscopy （SEM）. The effect of hydrogenation and base regulation was investigated by varying the Ni / La ratios. The result shows that the conversion of sorbitol was 98.6% and the yields of C2-C3 polyols was 43.8% when the mole ratio of Ni to La is 2：3. After two times of reaction, the catalyst still achieved a sorbitol conversion of 90%. From acidic to alkaline, the products distribution of hydrogenolysis of sorbitol was discussed. The reaction pathway was also proposed based on the experiment results.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2017年第6期2359-2367,共9页
CIESC Journal
基金
国家自然科学基金项目(51376185,51536009,51576199)~~
