Ag/ZrO_2催化剂上的1,2-丙二醇选择性气相氧化反应  

Gas-phase Selective Oxidation of 1,2-Propylene Glycol over Ag/ZrO_2 Catalyst

作　　者：沈江[1] 杜俊明[1] 黄静静[1] 杨新艳[1] 沈伟[1] 徐华龙[1] 范康年[1] 

机构地区：[1]复旦大学化学系和上海市分子催化与功能材料重点实验室,上海200433

出　　处：《化学学报》2007年第5期403-408,共6页Acta Chimica Sinica

摘　　要：采用浸渍法制备了一系列Ag/ZrO2催化剂,考察了Ag/ZrO2催化剂对1,2-丙二醇选择性氧化合成丙酮醛反应的催化性能.实验结果表明:在原料气配比为V(N2)∶V(O2)=300∶19,n(O2)/n(alcohol)=1.2,反应物液时空速为3.2g/(g·h),反应温度为673K时,1,2-丙二醇选择性氧化合成丙酮醛反应的转化率为95.7%,选择性为55.3%,高于传统电解银催化剂.UV-Vis DRS和XPS的研究结果表明:在Ag/ZrO2催化剂上存在大量的Ag+和Agδn+有利于促进催化活性的提高.Abstract A series of Ag/ZrO2 catalysts were prepared by impregnation method. The catalytic performance for selective oxidation of 1,2-propylene glycol to methyl glyoxal was investigated. Under optimum reaction conditions IV（N2） ： V（O2）=300 ： 19, n（O2）ln（alcohol）= 1.2, LHSV=3.2 g/（goh） and temperature=673 K], the conversion of 1,2-propylene glycol got to 95.7%, and the selectivity to methyl glyoxal was 55.3%, being higher than that over conventional electrolytic silver catalyst. The UV-vis DRS and XPS results indicated that the existence of large amount of Ag^＋ and Agn^δ＋ in Ag/ZrO2 catalysts contributes to the enhancement of catalytic activity.

关 键 词：1 2.丙二醇 丙酮醛 α-羟基丙酮 银 氧化锆 电子态 紫外可见漫反射 

分 类 号：O643.32[理学—物理化学]