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| Catalytic properties of LaBO3 perovskite catalysts in VOCs combustion |
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Abstract Perovskite-type catalysts of LaBO3 (B = Cr, Mn, Fe, Co, Ni) were prepared by copercipitation method and characterized by XRD, BET, H2-TPR and O2-TPD techniques. The catalytic performance of catalysts was evaluated for combustion of benzene, toluene, ethyl acetate, and acetone. Except for perovskite structure, La2CrO6 and La2O3 also would be formed in LaCrO3 and LaFeO3 catalysts, which led to destruction of active structure. But LaMnO3, LaCoO3 and LaNiO3 catalysts showed the perfect perovskite structure that resulted in high catalytic activity. Among these catalysts, LaMnO3 has richer lattice oxygen, and more favorably be used in catalytic combustion of VOCs with high C-H bond (such as benzene). In contrast, LaCoO3 and LaNiO3 presented richer surface oxygen because of its structures of anion defects, and were good catalysts for catalytic combustion of oxygenated VOCs (such as ethyl acetate and acetone).
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Received: 10 February 2012
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