低负载贵金属催化剂对二甲醚催化燃烧的催化活性

采用浸渍法以g-Al2O3为载体制备了多种低负载量的Pd和Pt催化剂，在微型固定床反应器装置上进行了二甲醚(DME)催化燃烧实验. 考察了不同贵金属负载量的Pd/g-Al2O3和Pt/g-Al2O3催化剂的活性，及浸渍顺序对Pd-Pt/g-Al2O3双金属负载催化剂活性的影响，并测试了贵金属负载摩尔比不同的双金属负载催化剂的活性. Pt负载量0.025%(w)的催化剂在190℃将DME完全燃烧；Pd和Pt共同负载的催化剂Pd:Pt=2:1(mol), Pt 0.025%(w), Pd 0.027%(w), Pt先负载]性能更好，在175℃将DME完全燃烧；200 h实验后2种催化剂活性降低均小于5%.

Catalytic Activity of Low-loading Pd and Pt Supported Catalysts for Combustion Of Dimethyl Ether

In order to select desirable catalysts for combustion of dimethyl ether (DME), a series of low-loading Pd and Pt catalysts were prepared by impregnation on g-Al2O3. The effects of loading amount and sequence of the metals on catalytic performance were investigated, and the effect of loading molar ratio of the metals. Using 0.025%(w) Pt-loaded catalyst, DME was completely converted to CO2 and H2O at 190℃. The catalyst with Pd and Pt loaded together Pd:Pt=2:1(mol), Pt 0.025%(w), Pd 0.027%(w), Pt first-loaded] had better performance, by which DME was completely converted at 175℃. Catalytic activity of these two catalysts was decreased by less than 5% after 200 h reaction.