CoO_x/CeO_2催化剂上的CO低温氧化反应(英文)

A CoO_x/CeO_2 Catalyst for Low-Temperature CO Oxidation

采用沉淀氧化法制备了CoOx/CeO2催化剂,并分别在干燥和含有水汽的原料气中进行了CO的氧化反应.结果发现,CoOx/CeO2复合氧化物催化剂具有良好的CO低温氧化活性和抗水性.在干燥的原料气中和196 K的条件下,该催化剂催化氧化CO的转化率可连续400 min以上保持在99 %;当温度升高到298 K反应2 400 min后,CO的转化率可达到94 %.而当反应气中含有3 .1 %的水汽时,在383 K下反应2 400 min后, CO的转化率仍可保持在79 %.

A CoOx/CeO2 catalyst was prepared by the co-precipitation oxidation method, and its catalytic performance for CO oxidation was investigated under humid and dry conditions , respectively. The CoOx/CeO2 catalyst exhibited excellent activity and good resistance to water vapor poisoning. Remarkably, 99% CO conversion could be achieved at 196 K for more than 400 min under dry condition, and when the reaction was carried out at 298 K, the conversion of CO was maintained at 94% after 2 400 min. Even when 3.1% of water was added, the conversion of CO was still kept at 79 % after 2 400 rain on stream at 383 K.