摘要
分别采用浸渍法、沉积-沉淀法和共沉淀法制备了Ni-Al_2O_3催化剂,采用H2-TPR/TPD、XRD、NH3-TPD等对催化剂进行表征,并研究其催化乙酰丙酸加氢性能。结果表明,共沉淀法制备的催化剂中存在强的金属-载体相互作用、活性金属分散度高以及丰富的酸性中心。该催化剂表现出优异的催化乙酰丙酸加氢合成%-戊内酯性能以及高的使用稳定性。在160℃和4 MPa氢气压力反应条件下,乙酰丙酸转化率与%-戊内酯选择性可分别达85.0%和78.0%,催化剂循环使用3次时活性仍基本保持恒定。
Ni-Al2O3 catalysts were prepared by impregnation,deposition-precipitation,co-precipitation respectively,characterized by H2-TPR/TPD,XRD and NH3-TPD techniques and evaluated in liquid-phase hydrogenation of levulinic acid with ethanol as solvent. The results demonstrated that strong metal-support interaction,highly dispersion of Ni species and large amounts of acidic sites were detected in catalyst prepared by co-impregnation method. The catalyst prepared by co-impregnation exhibited superior performance and highly stability in the synthesis of %-valerolactone via levulinic acid hydrogenation. 85. 0% conversion of levulinic acid with 78. 0% selectivity of %-valerolactone had been achieved at160 ℃,4 MPa of H2 pressure using ethanol as solvent. Both conversion of levulinic acid and selectivity of%-valerolactone remained almost constant after reuse of 3 times.
作者
王杰
徐亚琳
郭健健
张因
赵永祥
Wang Jie;Xu Yalin;Guo Jianjian;Zhang Yin Yongxiang(Engineering Research Center of Ministry of Education for Fine Chemicals, School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, Sahnxi, Chin)
出处
《工业催化》
CAS
2018年第4期15-20,共6页
Industrial Catalysis
基金
国家自然科学基金青年科学基金项目(21303097)
国家国际科技合作专项(2013DFA40460)