Preparation of alumina-supported Pd and LaMnO3 catalysts with the site-selective deposition and their catalytic activity for NO-CO reaction
Preparation of alumina-supported Pd and LaMnO3 catalysts with the site-selective deposition and their catalytic activity for NO-CO reaction
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DOI：
10.1016/j.cattod.2012.04.033
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发表时间：
2013-03
期刊：
影响因子：
5.3
通讯作者：
Akihiro Tou;H. Einaga;Y. Teraoka
中科院分区：
文献类型：
--
作者：
Akihiro Tou;H. Einaga;Y. Teraoka
将孔内沉积Pd和孔内/孔外选择性沉积LaMnO 3的制备技术相结合，成功地制备了两种氧化铝负载的Pd-LaMnO 3催化剂。负载型Pd-LaMnO 3催化剂的还原行为表明，当Pd和LaMnO 3同时存在于氧化铝孔中时（Pd/LaMnO 3/Al 2 O3），Pd和LaMnO 3相互靠近，发生相互作用;当Pd和LaMnO 3分别存在于氧化铝孔内外时（LaMnO 3 out/Pd/Al 2 O3），Pd的存在环境与Pd/Al 2 O3中的相似.对于NO-CO反应，Pd/Al_2O_3和LaMnO_3 out/Pd/Al_2O_3表现出相当的活性和N_2/N_2O选择性，而Pd/LaMnO_3/Al_2O_3表现出比两种催化剂更高的活性和不同的N_2/N_2O选择性，这表明Pd-LaMnO_3之间的密切相互作用是有效地改善Pd物种的催化性能。Pd/LaMnO 3/Al 2 O3在800°C的焙烧温度下仍保持优异的催化性能。
By the combination of the preparation techniques of intra-pore deposition of Pd and selective intra/extra-pore deposition of LaMnO3, two types of alumina supported Pd–LaMnO3catalysts were successfully obtained. It was suggested from the reduction behavior of supported Pd–LaMnO3catalysts that when both Pd and LaMnO3coexisted in the alumina pores (Pd/LaMnO3/Al2O3), Pd and LaMnO3existed in close proximity each other to appear the interaction and that when Pd and LaMnO3exist separately in and out of alumina pores, respectively (LaMnO3out/Pd/Al2O3), the existing environment of Pd was similar to that in Pd/Al2O3. For NO–CO reaction, Pd/Al2O3and LaMnO3out/Pd/Al2O3showed comparable activity and N2/N2O selectivity, and Pd/LaMnO3/Al2O3showed higher activity than and different N2/N2O selectivity from the two catalysts, revealing that the intimate Pd–LaMnO3interaction is effective to modify the catalytic property of Pd species. The excellent catalytic property of Pd/LaMnO3/Al2O3was sustained up to 800°C of calcination temperature.