Ce1-xNixO2/Al2O3/FeCrAl催化剂的制备及其甲烷催化燃烧性能

以FeCrA l合金薄片为基体,A l2O3为过渡载体,Ce1-xN ixO2(x=0.1-0.3)、CeO2和N iO为活性组分,制备了Ce1-xN ixO2/A l2O3/FeCrA l、CeO2/A l2O3/FeCrA l和N iO/A l2O3/FeCrA l金属基整体式催化剂,在固定床微型反应器中评价了催化剂的甲烷催化燃烧性能,用SEM、XRD、TPR等方法对催化剂的物相、表面形貌和氧化还原性进行了表征.结果表明,Ce1-xN ixO2在催化剂表面的分散性比CeO2和N iO要好;Ce1-xN ixO2/A l2O3/FeCrA l(x=0.1-0.3)催化剂具有好的催化活性和高温稳定性,CeO2/A l2O3/FeCrA l和N iO/A l2O3/FeCrA l催化剂有好的初活性但高温稳定性较差;活性组分与A l2O3和FeCrA l金属基体之间存在较强的相互作用.

Preparation of Ce1-xNixO2/Al2O3/FeCrAl Catalysts and Performance for Catalytic Combustion of Methane

A series of Ce_(1-x)Ni_(x)O_2/Al_2O_3/FeCrAl(x=0.1-0.3),CeO_2/Al_2O_3/FeCrAl and NiO/Al_2O_3/FeCrAl monolith catalysts were prepared using the FeCrAl alloy foils as support,Al_2O_3 as washcoat layer and Ce_(1-x)Ni_xO_2 solid solution,CeO_2 and NiO as active component.The catalytic activity of the catalysts for the combustion of methane was evaluated in a conventional quartz flow reactor.The structure of the catalysts was characterized using XRD,SEM and H_2-TPR.The results indicate that Ce_(1-x)Ni_(x)O_2 solid solution was well dispersed on the surface of the catalyst support.The Ce_(1-x)Ni_(x)O_2/Al_2O_3/FeCrAl catalysts had a good catalytic activity and thermal stability for the combustion of methane.The CeO_2/Al_2O_3/FeCrAl and NiO/Al_2O_3/FeCrAl catalyst had a well initial catalytic activity,but the thermal stability for the combustion of methane was not good.There were a strong interaction among the Ce_(1-x)Ni_xO_2 solid solutions and the Al_2O_3 washcoat and the FeCrAl alloy foils support.