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Efficient direct decomposition of no over La_(0.8)A_(0.2)NiO_(3)(A=K, Ba, Y) Catalysts under Microwave Irradiation

Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 17-23页

作者：王浩 ZHAO Zijian DUAN Xinghui ZHOU Shijia School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

La_(0.8)A_(0.2)NiO_(3) (A=K,Ba,Y) catalysts supported on the microwave-absorbing ceramic heating carrier were prepared by the sol-gel *** crystalline phase and the catalytic activity of the La_(0.8)A_(0.2)NiO_(3)catalysts were characterized by XRD and H_(2) temperature-programmed reduction (TPR).The effects of reaction temperature,oxygen concentration,and gas flow rate on the direct decomposition of nitric oxide over the synthesized catalysts were studied under microwave irradiation (2.45 GHz).The XRD results indicated that the La_(0.8)A_(0.2)NiO_(3) catalysts formed an ABO_(3) perovskite structure,and the H_(2)-TPR results revealed that the relative reducibility of the catalysts increased in the order of La_(0.8)K_(0.2)NiO_(3)>La_(0.8)Ba_(0.2)NiO_(3)>La_(0.8)Y_(0.2)Ni O_(3).Under microwave irradiation,the highest NO conversion amounted to 98.9%,which was obtained with the La_(0.8)K_(0.2)NiO_(3) catalyst at 400℃.The oxygen concentration did not inhibit the NO decomposition on the La_(0.8)A_(0.2)NiO_(3) catalysts,thus the N_(2) selectivity exceeded 99.8%under excess oxygen at 550℃.The NOconversion of the La_(0.8)A_(0.2)NiO_(3) catalysts decreased linearly with the increase in the gas flow rate.

关键词： microwave catalysis direct decomposition of no microwave-absorbing heating ceramics perovskite catalyst

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Roles　of　Oxygen　Vacancy　and　Lower　Valence　Metallic　Ion　in　direct　decomposition　of　NO　over　La_（2－x）（Sr，Th）_xCuO_（4±λ）

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Journal of Rare Earths 1996年第4期14卷 241-245页

作者：赵震杨向光吴越 Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China

Two systems of La_(2-x)Sr_xCuO_(4±λ) and La_(2-x)Th_xCuO_(4±λ) mixed oxides with K_2NiF_4structure were *** compositions and structures of the catalysts were characterized by means of XRD,XPS,chemical analysis and so *** catalytic behavior for the direct decomposition of no has been *** results show that the catalytic activity is closely related to the oxygen vacancy and lower valence metallic ion in the direct decomposition of *** presence of oxygen vacancy is necessary for mixed oxide to have steady activity in NO decomposition.

关键词： K_2NiF_4-type mixed oxides direct decomposition of no Oxygen vacancy Lower valence metallic ion

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