摘要
以硝酸镍和偏硅酸钠为原料,采用并流共沉淀和氢气还原-钝化的方法制备了Ni/Si O2催化剂,通过BET、XRD、H2-TPD、NH3-TPD、HRTEM、XPS等手段对催化剂的理化性质进行了表征,发现合成得到的Ni/Si O2催化剂具有良好的织构性质、极高的金属分散度和活性比表面积,并且对甘油氢解生成1,2-丙二醇的反应表现出良好的活性和选择性.研究还考察了催化剂的镍硅比、反应停留时间、反应压力、甘油浓度对甘油氢解性能的影响,发现在镍硅比为0.5,反应停留时间为2 h,反应压力为5.5 MPa,甘油浓度为10%的条件下,甘油的单程转化率达78.8%,1,2-丙二醇的选择性高达92.9%.
The Ni / Si O2 catalysts were synthesized by coprecipitation using nickel nitrate and sodium metasilicate as precursors. The bulk and surface properties of these samples were characterized by low temperature N2 adsorption,X-ray diffraction（ XRD）,H2 temperature programmed desorption（ H2-TPD）,NH3 temperature programmed desorption（ NH3-TPD）,high resolution transmission electron microscopy（ HRTEM） and X-ray photoelectron spectroscopy（ XPS）. It is found that the synthesized Ni / Si O2 catalysts exhibited excellent textural properties,very high metal dispersion and active specific surface area. Further,the synthesized catalysts present high activity and selectivity for glycerol hydrogenolysis to 1,2-propanediol. The study also examined the effects of the ratio of nickel and silicon,residence time,the pressure of reaction and the concentration of the glycerol solution on the catalytic performances of the synthesized catalysts. The result showed the conversion of glycerol up to 78. 8%,1,2-propanediol selectivity as high as 92. 9% were realized when a Ni ∶ Si ratio of 0. 5,a residence time of 2 hours,a reaction pressure of 5. 5 MPa and a glycerol concentration of 10% were exerted.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2015年第5期403-413,共11页
Journal of Molecular Catalysis(China)
基金
江苏省自然科学基金(SBK2012681)
高等学校博士学科点专项科研基金(20123250120008)
江苏高校优势学科建设工程~~
