Abstract
La0.8A0.2NiO3 (A=K, Ba, Y) catalysts supported on the microwave-absorbing ceramic heating carrier were prepared by the sol-gel method. The crystalline phase and the catalytic activity of the La0.8A0.2NiO3 catalysts were characterized by XRD and H2 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 La0.8A0.2NiO3 catalysts formed an ABO3 perovskite structure, and the H2-TPR results revealed that the relative reducibility of the catalysts increased in the order of La0.8K0.2NiO3 > La0.8Ba0.2NiO3 > La0.8Y0.2NiO3. Under microwave irradiation, the highest NO conversion amounted to 98.9%, which was obtained with the La0.8K0.2NiO3 catalyst at 400 °C. The oxygen concentration did not inhibit the NO decomposition on the La0.8A0.2NiO3 catalysts, thus the N2 selectivity exceeded 99.8% under excess oxygen at 550 °C. The NO conversion of the La0.8A0.2NiO3 catalysts decreased linearly with the increase in the gas flow rate.
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Wang, H., Zhao, Z., Duan, X. et al. Efficient Direct Decomposition of NO over La0.8A0.2NiO3 (A=K, Ba, Y) Catalysts under Microwave Irradiation. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 39, 17–23 (2024). https://doi.org/10.1007/s11595-024-2849-y
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DOI: https://doi.org/10.1007/s11595-024-2849-y