预处理气氛对CuO/CeO_2/γ-Al_2O_3催化剂表面性质及“NO+CO”反应性能的影响(英文)

• 作 者: 朱捷 葛奉娟
• 机 构: 徐州工程学院化学化工学院,
• 出 处: 无机化学学报
• 发表日期: 2015年01期
• 关键词: 催化剂 多相催化 CuO/CeO_2 NO+CO Al_2O_3 氮氧化物 污染防治 预处理 预处理气氛 前驱体制备

用不同的预处理气氛制备了CeO2/γ-Al2O3载体以调节表面Ce的价态,并以Cu(CH3COO)2为前驱体制备了CuCeAl催化剂。XRD和H2-TPR的结果表明在还原气氛下处理的CeO2/γ-Al2O3载体具有更多的活性氧原子,因此相应的CuCeAl催化剂表面有更多分散态的Cu2+/Cu+物种。NO+CO反应的结果表明分散态的Cu2+/Cu+是NO转化的活性物质,而Cu0在低温下具有较好的N2选择性。因此,同时含有分散态Cu2+/Cu+和少量晶相Cu0的催化剂具有最好的催化性能。

The CeO2 / γ-Al2O3 carrier was prepared by different pretreatment atmosphere to adjust the valence of Ce on the surface, CuCeAl catalyst was prepared by using Cu (CH3COO) 2 as precursor. The results of XRD and H2-TPR show that the CeO2 / γ-Al2O3 carrier treated in a reducing atmosphere has more active oxygen atoms and therefore more Cu2 + / Cu + species dispersed on the corresponding CuCeAl catalyst surface. The results of NO + CO reaction show that the dispersed Cu2 + / Cu + is the active material for NO conversion, whereas Cu0 has better N2 selectivity at low temperature. Therefore, the catalyst containing both Cu2 + / Cu + and a small amount of Cu0 has the best catalytic performance.