A series of Ce-doped Ni-Al-Ox catalysts were prepared by a urea-hydrolysis method, and were applied for CO-NO reaction. The results showed that Ce-doped Ni-Al-Ox exhibited much higher NO conversions than Ni-Al-Ox. Furthermore, the activity increased with the raising of Ce doping ratio. More than 95% NO could be converted at temperature as low as 250℃ over NiAlCe30O and NiAlCe20O. These catalysts also showed excellent resistance to H2O. Ce-doped Ni-Al-Ox catalysts were characterized by XRD, N2 physisorption, Raman, XPS, H2-TPR, NO-TPD, and in situ DRIFTs. XRD and Raman results showed that Ni-Ce-O solid solution was formed in Ni-Al-Ce-Oxcatalyst. Meanwhile, oxygen vacancies increased with the increasing of Ce doping ratio. H2-TPR results indicated that the redox ability was improved by Ce doping. NO-TPD and in situ DRIFTs results revealed that the increasing number of oxygen vacancies resulted from Ce doping were beneficial to the dissociation of NO to N2 or N2O rather than the oxidation of NO to nitrates.
郭磊, 张涛, 常化振, 李俊华. Ce掺杂改性Ni-Al-Ox催化剂CO-NO反应性能[J]. 中国环境科学, 2018, 38(9): 3313-3321.
GUO Lei, ZHANG Tao, CHANG Hua-zhen, LI Jun-hua. Study on Ce-doped Ni-Al-Ox catalysts for NO reduction by CO. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(9): 3313-3321.
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