摘要
采用浸渍法以Cu(CH3COO)2为前驱体,在N2气氛下于不同温度下焙烧,制备了CuOx/CeO2催化剂。结合XRD,H2-TPR,XPS等表征技术,以及CO-PROX(Preferential Oxidation of CO)反应测试,获得了CuOx/CeO2催化剂中不同Cu物种随焙烧温度变化的分布信息及其对CO-PROX催化活性的影响。结果表明:CuOx/CeO2催化剂CO-PROX催化活性变化的趋势与催化剂表面分散态Cu+物种变化趋势一致,随着焙烧温度从200℃升至500℃,催化剂表面的分散态Cu+先增加后减少,当分散态Cu+在焙烧温度250～400℃达到最多时,其催化活性最好,随后下降,说明分散态Cu+对CO-PROX反应活性起关键作用。
Using Cu （ CH3 COO） 2 as precursor, heated by different temperatures under inert nitrogen atmos phere, a series of CuOx/CeO2 catalysts were prepared by impregnation method. The Cu species distributions were characterized by means of XRD, HETPR, XPS, FTIR, the effects the active Cu species on CO oxida tion in HErich gases were also investigated. The re sults indicated that the enhancement of COPROX ac tivity was combined with the high dispersed Cu ＋ species. As the calcination temperature increased from 200 to 500 ℃, the dispersed Cu ＋ increased first, and then decreased. As the amount of dispersed Cu ＋ on the catalyst surface increased to its maximum at a cer tain maintained temperature between 250 and 400 ℃, its catalysis activity reached the highest. These results suggested that the dispersed Cu ＋ species play a cruci al role in the high reaction activity of CO oxidation in H2rich gases.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2013年第2期181-189,共9页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(21273110)
江苏省科技工业支撑计划(BE2011167)
厦门大学固体表面物理化学国家重点实验室开放课题(201207)资助
