摘要
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 synthesis of 1,2-propanediol by the selective hydrogenolysis of glycerol over the Cu-H4SiW12O40/γ-Al2O3 catalysts in a fixed-bed reactor was investigation.It was found that the lower liquid hourly space velocity may promote the glycerol conversion but reduce the selectivity of 1,2-propanediol.The loading of H4SiW12O40 on the catalyst which exhibited a significance on the glycerol conversion and a maximum glycerol conversion was obtained at the H4SiW12O40 loading of 5%.NH3-TPD and H2-TPR suggested that Cu-H4SiW12O40/γ-Al2O3 acted as a bi-functional catalyst in the reaction：glycerol dehydration to dehydrated intermediates over H4SiW12O40/γ-Al2O3 and the following hydrogenation over Cu.
出处
《精细化工》
CAS
CSCD
北大核心
2010年第8期775-778,共4页
Fine Chemicals
