Catalytic reduction of no over perovskite-type catalysts |
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Authors: | Seong-Soo Hong Gun-Dae Lee Jong-Won Park Dae-Won Park Kyung-Mok Cho Kwang-Jung Oh |
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Affiliation: | (1) Department of Chemical Engineering, Pukyong National University, 100 Yongdang-dong, Nam-ku, 608-739 Pusan, Korea;(2) Surface & Coating, Engineering, Pukyong National University, 100 Yongdang-dong, Nam-ku, 608-739 Pusan, Korea;(3) Department of Chemical Engineering, Pukyong National University, 100 Yongdang-dong, Nam-ku, 608-739 Pusan, Korea;(4) Metallurgical Engineering, Pukyong National University, 100 Yongdang-dong, Nam-ku, 608-739 Pusan, Korea;(5) Environmental Engineering, Pusan National University, 609-735 Pusan, Korea |
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Abstract: | In the present work, we have investigated the reduction of NO by propane over perovskite-type oxides prepared by malic acid method. The catalysts were modified to enhance the activity by substitution of metal into A or B site of perovskite oxides. In addition, the reaction conditions, such as temperature, O2 concentration, and space velocity have been varied to understand their effects on the catalytic performance. In the LaCoO3 type catalyst, the partial substitution of Ba and Sr into A site enhanced the catalytic activity in the reduction of NO. For the La0.6Ba (Sr)o.4 Co1−x FexO3 (x=0-1.0) catalyst, the partial substitution of Fe into B site enhanced the conversion of NO, but excess amount of Fe decreased the conversion of NO. The surface area and catalytic activity of perovskite catalysts prepared by malic acid method showed higher values than those of solid reaction method. The conversion of NO increased with increasing O2 concentration and contact time. The introduction of water into reactant feed decreased the catalytic activity but the deactivation was shown to be reversible over La0.6Ba0.4Co1−x ,FexO3 catalyst. |
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Keywords: | Reduction of NO Perovskite-type Oxides Malic Acid Method Effect of Water Substitution of Ba Sr and Fe, TPR |
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