Direct synthesis of hydrogen peroxide from H2 and O2 using TiO2-supported Au-Pd catalysts
Direct synthesis of hydrogen peroxide from H2 and O2 using TiO2-supported Au-Pd catalysts
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DOI：
10.1016/j.jcat.2005.09.015
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发表时间：
2005-11-15
影响因子：
7.3
通讯作者：
Hutchings, GJ
中科院分区：
文献类型：
--
作者：
Edwards, JK;Solsona, BE;Hutchings, GJ
讨论了在低温（2 ℃）下使用TiO 2负载的Au、Pd和Au-Pd催化剂由H-2和O-2直接合成H2 O2。Au-Pd催化剂的性能明显优于纯Pd/TiO 2和Au/TiO 2材料。Au-Pd粒子具有核壳结构。Pd集中在表面上。在未煅烧的催化剂中观察到H2 O2的最高产率，但这些催化剂特别不稳定。在使用过程中会损失两种金属。相比之下，在400 ℃下煅烧的样品是稳定的，并且可以重复使用多次而不损失性能。这些催化剂在25 ℃下对CO氧化表现出低活性;相反，对低温CO氧化有效的催化剂对H-2氧化成H2 O2无活性。这种相互关系是探索的机制，其中催化剂的功能和催化剂的设计，这些底物中的一个在其他的存在下的选择性氧化。(c)2005年爱思唯尔公司All rights reserved.
The direct synthesis of H2O2 at low temperature (2 degrees C) from H-2 and O-2 using TiO2-supported Au, Pd, and Au-Pd catalysts is discussed. The Au-Pd catalysts performed significantly better than the pure Pd/TiO2 and Au/TiO2 materials. Au-Pd particles were found with a core-shell structure. with Pd concentrated on the surface. The highest yields of H2O2 were observed with uncalcined catalysts, but these were particularly unstable. losing both metals during use. In contrast, samples calcined at 400 degrees C were stable and Could be reused several times without loss of performance. These catalysts exhibited low activity for CO oxidation at 25 degrees C; conversely, catalysts effective for low-temperature CO oxidation were inactive for H-2 oxidation to H2O2. This anticorrelation is explored in terms of the mechanism by which the catalysts function and the design of catalysts for the selective oxidation of one of these Substrates in the presence of the other. (c) 2005 Elsevier Inc. All rights reserved.