Cu_xCe_(1-x)O_(2-x)/SBA-15/堇青石整体式催化剂及其CO催化氧化性能

Preparation, Characterization and CO Catalytic Oxidation Performance of Cu_x Ce_(1-x) O_(2-x) /SBA-15/Cordierite Monolithic Catalysts

以堇青石蜂窝陶瓷为载体，CuxCe1-xO2-X/SBA-15为催化活性组分，制备了一系列10％～60％Cu0.5Ce0.5O1.5/SBA-15／堇青石和50％CuxCe1-xO2-x/SBA-15／堇青石（x=0~1）整体式催化剂，采用低温氮吸附-脱附、XRD、XPS和H2-TPR对催化剂进行了表征，在微型固定床反应器中评价了催化剂的CO催化氧化活性。结果表明：整体式催化剂仍然保持SBA-15的介孔结构,催化剂中除了堇青石的物相外，还有CuO和CeO2物相，催化剂表面的Cu以Cu^2＋和Cu^＋两种状态存在，Ce以Ce^4＋状态存在,催化剂表面的氧化还原性能与Cu0.5Ce0.5O1.5的含量和Cu、Ce的比例有一定的关系，50％Cu0.5Ce0.5O1.5/SBA-15／堇青石催化剂具有最好催化活性，CO可以在140℃完全转化。

Cu0.5Ce0.5O1.5/SBA-15/cordierite monolithic catalysts with the Cu0.5Ce0.5O1.5 content from 10% to 60% and 50%CuxCe1-xO2-x/SBA-15/cordierite （x=0~l） monolithic catalysts were prepared using the cordierite as the support and the CuxCel-xO2-x/SBA-15 as the catalytic component. The catalysts were characterized using Low Temperature Nitrogen Adsorption-Desorption, XRD, XPS and HE-TPR. The catalytic activity of the catalysts for the oxidation of CO was evaluated. The results indicate that the mesoporous structure of SBA-15 is retained in the monolithic catalysts. There are the CuO and CeO2 phases in addition to the cordierite phase. On the surface of the catalyst Cu exists as Cu^2＋ and Cu^＋ species and Ce is as Ce^4＋ species. The redox performance of the monolithic catalysts is related with the Cu0.sCe0.501.5 content and the ratio of the Cu and Ce in the CuxCel-xO2-x/SBA-15. 50%Cu0.5Ceo.5O1.5/SBA-15/cordierite monolithic catalyst exhibits the best catalytic activity. CO can be completely oxidized at 140℃.