Journal
CHEMICAL ENGINEERING JOURNAL
Volume 369, Issue -, Pages 511-521Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.03.066
Keywords
Emission control; Perovskite oxide; NO plus CO reaction; N-2 selectivity; In situ DRIFTS
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Funding
- National Nature Science Foundation of China [21507014, 21663006, 21763003]
- Key Project of Chinese National Programs for Fundamental Research and Development (973 program) [2012CB21500203]
- Program for Science and Technology Development Plan of Nanning [20163146]
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Catalytic removal of NO by CO has been studied over a series of LaNi0.5M0.5O3 (M = Co, Mn, Cu) perovskite oxide catalysts were synthetized via an improved sol-gel method. The effects of M-doped on physicochemical properties of LaNiO3 were systemic characterized by XRD, BET, SEM, ICP-AES, XPS, H-2-TPR and O-2-TPD techniques. The possible catalytic mechanism for NO + CO model reaction was also tentatively proposed with the help of the in situ DRIFTS technique. The M-doped samples remained pure perovskite structure and exhibited modified activity, among which the LaNi0.5M0.5O3 possessed optimized catalytic performance, especially superior N-2 selectivity. It is confirmed that the amorphous CuO highly dispersed on Cu-doped defective perovskite oxide, the reduction of Cu2+ to Cu+ is vital for the chemisorption of CO, a large amount of oxygen vacancies accelerated the dissociation of NO and N2O. Hence, adsorbed CO can fast react with N and O at lower temperature, afterwards N2O was converted to N-2 fleetly, leading the improvement of activity/selectivity toward NO + CO reaction.
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