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作 者:杜小春[1] 刘志敏[1] 罗勇悦[1] 陈耀强[1] 龚茂初[1]
机构地区:[1]四川大学化学学院,成都610064
出 处:《化学学报》2005年第18期1651-1655,共5页Acta Chimica Sinica
基 金:国家重点基础研究规划(No.G1999022407);国家自然科学基金(No.20273043)资助项目
摘 要:用质量比为3∶2的YSZ-γ-Al2O3和CeO2-Y2O3-ZrO2的混合物(以YSZA+CYZ表示)作载体,制备了不同Co3O4含量的整体式甲烷燃烧催化剂,同时制备了分别以YSZA和CYZ为载体的催化剂作为对比,研究了它们老化前后的反应性能,并用BET,XPS,XRD,TPR等研究了催化剂的比表面、表面状态、晶相结构和还原性能.结果表明,YSZ-γ-Al2O3和CeO2-Y2O3-ZrO2混合载体能有效地抑制CoAl2O4的生成,并能充分发挥各自的优点,因此负载一定量的钴后表现出很高的甲烷催化燃烧活性和抗老化性,尤其是含8wt%Co3O4的样品性能最佳,有望成为实用的甲烷燃烧催化剂之一.A series of cobalt-based monolithic catalysts supported on mixture of YSZ-γ-Al2O3 and CeO2-Y2O3-ZrO2 were prepared by impregnation method, and characterized by XRD, XPS, BET and H2-TPR. Contrasting with the 8 wt% Co3O4-based monolithic catalyst supported on YSZ-γ-Al2O3 or CeO2-Y2O3-ZrO2, the catalytic activities for methane combustion were assessed in a micro-reactor. All the mixture supported monolithic catalysts had higher activity for methane combustion than the contrast catalysts. After calcination at 1000 ℃for 5 h, the monolithic catalysts remained highly active and very stable, especially the catalyst containing 8 wt% of Co3O4 had the highest activity and methane was completely converted to CO2 at ca. 514℃. The results showed that the mixture had the advantage of CeO2-Y2O3-ZrO2 and YSZ-γ-Al2O3 (γ-Al2O3 modified by Y2O3 and ZrO2) and can resist forming the crystal of CoAl2O4 effectively.
关 键 词:甲烷催化燃烧 整体式催化剂 CO3O4 YSZ-γ-Al2O3 CeO2-Y2O3-ZrO2 燃烧催化剂 整体式 Γ-AL2O3 反应性能 抗老化性
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