Sonochemical Hydrogen Production Efficiently Catalyzed by Au/TiO2
Sonochemical Hydrogen Production Efficiently Catalyzed by Au/TiO2
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DOI：
10.1021/jp105691v
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发表时间：
2010-09
影响因子：
3.7
通讯作者：
Yifeng Wang;Dan Zhao;Hongwei Ji;Guilin Liu;Chuncheng Chen;Wanhong Ma;Huaiyong Zhu;Jincai Zhao-Jincai-Zh
中科院分区：
文献类型：
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作者：
Yifeng Wang;Dan Zhao;Hongwei Ji;Guilin Liu;Chuncheng Chen;Wanhong Ma;Huaiyong Zhu;Jincai Zhao-Jincai-Zh
Au/TiO 2是一种高效的声催化剂，用于从水或水溶液中产生H2。Au/TiO 2显著提高了超声分解水中H·和·OH自由基的产率。产物分析和同位素证据表明，甲醇/水溶液中氢分子的形成途径有三种：（1）水分子裂解产生的两个H·原子的复合，（2）水裂解产生的H·从甲醇中夺氢，（3）甲醇的热重整。每一个途径的相对重要性进行了评估，通过仔细分析的氢同位素组成的演变氢气使用改进的气相色谱仪。还讨论了超声分解过程中甲醇/水溶液中氢气的来源。数据显示，虽然在Au/TiO 2存在下添加甲醇导致H2析出速率增加12倍，但仍有近一半的氢原子来自水分子。控制...
Au/TiO2 was used as a highly efficient sonocatalyst to produce H2 from water or aqueous solutions. Au/TiO2 significantly increased the yields of H• and •OH radicals in the sonolysis of water. Product analysis and isotope evidence indicated that hydrogen molecules derived from methanol/water solutions were formed by three pathways: (1) recombination of two H• atoms from the cleavage of water molecules, (2) H-abstraction from methanol by H• generated by water cleavage, and (3) thermal reforming of methanol. The relative importance of each pathway was assessed by carefully analyzing the hydrogen-isotope composition of the evolved hydrogen gas using a modified gas chromatograph. The source of hydrogen in the H2 evolved from methanol/water solutions during sonolysis was also addressed. Data showed that, although the addition of methanol in the presence of Au/TiO2 resulted in a 12-fold increase in the rate of H2 evolution, nearly half of the hydrogen atoms were nevertheless derived from water molecules. Control...