Switching Off Hydrogen Peroxide Hydrogenation in the Direct Synthesis Process
Switching Off Hydrogen Peroxide Hydrogenation in the Direct Synthesis Process
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DOI：
10.1126/science.1168980
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发表时间：
2009-02-20
期刊：
影响因子：
56.9
通讯作者：
Hutchings, Graham J.
中科院分区：
文献类型：
--
作者：
Edwards, Jennifer K.;Solsona, Benjamin;Hutchings, Graham J.
过氧化氢（H2O2）是一种重要的消毒剂和漂白剂，目前通过间接工艺生产，包括对蒽醌的顺序氢化/氧化。然而，H-2和O-2直接反应的方法更可取。不幸的是，直接合成H2O2的催化剂对其随后的分解也有效，这限制了它们的发展。研究表明，对金-钯合金催化剂的碳载体进行酸预处理可以阻止H2O2的分解。这种处理减小了合金纳米颗粒的尺寸，这些较小的纳米颗粒可能修饰并抑制了分解反应的位点。因此，当用于直接合成H2O2时，酸预处理催化剂的H2O2产率高，氢选择性大于95%。
Hydrogen peroxide (H2O2) is an important disinfectant and bleach and is currently manufactured from an indirect process involving sequential hydrogenation/ oxidation of anthaquinones. However, a direct process in which H-2 and O-2 are reacted would be preferable. Unfortunately, catalysts for the direct synthesis of H2O2 are also effective for its subsequent decomposition, and this has limited their development. We show that acid pretreatment of a carbon support for gold- palladium alloy catalysts switches off the decomposition of H2O2. This treatment decreases the size of the alloy nanoparticles, and these smaller nanoparticles presumably decorate and inhibit the sites for the decomposition reaction. Hence, when used in the direct synthesis of H2O2, the acid- pretreated catalysts give high yields of H2O2 with hydrogen selectivities greater than 95%.