Effect of alloy composition on dispersion stability and catalytic activity for NO oxidation over alumina-supported Pt-Pd catalysts
Effect of alloy composition on dispersion stability and catalytic activity for NO oxidation over alumina-supported Pt-Pd catalysts
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DOI：
10.1007/s10562-007-9124-7
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发表时间：
2007-07-01
影响因子：
2.8
通讯作者：
McCabe, R. W.
中科院分区：
文献类型：
--
作者：
Graham, G. W.;Jen, H.-W.;McCabe, R. W.
应用促进合金形成的合成程序，制备了涵盖组成范围富Pt一半的高分散氧化铝负载Pt-Pd催化剂，在富氧水热条件下老化，并通过CO化学吸附、XRD和TEM进行表征。异常大的颗粒，典型的纯Pt催化剂在这样的条件下处理，没有发现在任何含Pd的催化剂，和颗粒粗化的程度，由于老化被发现随着Pd含量的增加而减少。合金化似乎对NO氧化翻转频率影响不大，其随分散度降低而增加。
Applying a synthesis procedure that promotes alloy formation, highly-dispersed alumina-supported Pt-Pd catalysts spanning the Pt-rich half of the composition range were prepared, aged under oxygen-rich hydrothermal conditions, and characterized by CO chemisorption, XRD, and TEM. Anomalously large particles, typical of pure Pt catalysts treated under such conditions, were not found in any of the Pd-containing catalysts, and the extent of particle coarsening due to aging was found to decrease with increasing Pd content. Alloying appears to have little effect on the NO oxidation turn-over frequency, which increases with decreasing dispersion.