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采用分步等体积浸渍法合成了Cu-H4SiW12O40/γ-Al2O3催化剂,并研究了其在甘油氢解反应中的催化性能。系统考察了H4SiW12O40的负载量、体积空速对反应的影响,以及催化剂的稳定性。并利用X射线衍射(XRD)、程序升温还原(H2-TPR)和氨气程序升温脱附(NH3-TPD)等手段对催化剂进行了表征。结果表明,较低的体积空速有利于提高甘油的转化率,但对1,2-丙二醇的选择性不利;催化剂上所负载H4SiW12O40的质量分数对甘油转化率影响较大,在H4SiW12O40的质量分数为5%时甘油的转化率达到最大值90.05%;负载型催化剂Cu-H4SiW12O40/γ-Al2O3具有双功能催化性质:同时具有酸中心和金属加氢中心。
The Cu-H4SiW12O40 / γ-Al2O3 catalyst was synthesized by a step-by-step impregnation method and its catalytic performance in the hydrogenolysis of glycerol was studied. The influence of H4SiW12O40 loading, volume space velocity on the reaction and the stability of the catalyst were systematically investigated. The catalysts were characterized by XRD, H2-TPR and NH3-TPD. The results showed that the lower volume space velocity could improve the conversion of glycerol, but the selectivity to 1,2-propanediol was unfavorable. The mass fraction of H4SiW12O40 supported on the catalyst had a great effect on the conversion of glycerol. When the mass fraction of H4SiW12O40 The conversion rate of glycerol reaches 90.05% at the maximum of 5%. The supported catalyst Cu-H4SiW12O40 / γ-Al2O3 has bifunctional catalysis property: it has both acid sites and metal hydrogenation centers.