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首页> 外文期刊>Journal of Catalysis >The roles of metal co-catalysts and reaction media in photocatalytic hydrogen production: Performance evaluation of M/TiO2 photocatalysts (M = Pd, Pt, Au) in different alcohol-water mixtures
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The roles of metal co-catalysts and reaction media in photocatalytic hydrogen production: Performance evaluation of M/TiO2 photocatalysts (M = Pd, Pt, Au) in different alcohol-water mixtures

机译：金属助催化剂和反应介质在光催化制氢中的作用：不同醇水混合物中M / TiO2光催化剂（M = Pd，Pt，Au）的性能评估

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M/TiO2 photocatalyst activity for H-2 production depends on both the metal co-catalyst (M) and the reaction medium. To quantify such effects, we compared the performance of M/TiO2 photocatalysts (M = Pd, Pt, Au) for H-2 production in different alcohol-water mixtures under UV excitation. Photocatalysts were prepared using Degussa P25 TiO2 at metal loadings of 0.5 and 1 wt.% for Pd, 1 wt.% for Pt and 1 wt.% for Au. TEM, UV-Vis, XPS and EXAFS analyses confirmed the presence of supported metal nanoparticles of size similar to 2, 1.3 and 5.4 nm for Pd/TiO2, Pt/TiO2 and Au/TiO2, respectively. Photoluminescence data established that the metal co-catalysts effectively suppressed electron-hole pair recombination in TiO2 following photo-excitation. The activities of the M/TiO2 photocatalysts for Hy production were evaluated in a wide range of alcohol-water mixtures (alcohol concentration 10 vol.%) under UV (365 nm, 5 mW cm(-2)). H-2 production rates in the alcohol-water mixtures were dependent on (i) the metal co-catalyst; (ii) the co-catalyst loading; and (iii) the alcohol type. Co-catalyst activity followed the order Pd > Pt approximate to Au. The highest Hy production rates were achieved for the 1 wt.% Pd/TiO2 photocatalyst in glycerol-water mixtures (47.5 mmol g(-1)h(-1)) and 1,2-ethanediol-water mixtures (44.5 mmol g(-1) h(-1)). H2 production rates decreased in the order glycerol > 1,2-ethanediol > 1,2-propanediol > methanol > ethanol > 2-propanol > tert-butanol water. For each M/TiO2 photocatalyst, correlations were established between the rate of H2 production and specific alcohol properties, especially alcohol polarity and the exponential of the alcohol oxidation potential. (C) 2015 Elsevier Inc. All rights reserved.
机译：用于生产H-2的M / TiO2光催化剂活性取决于金属助催化剂（M）和反应介质。为了量化这种影响，我们比较了在紫外线激发下，在不同的醇水混合物中，H / 2生产中的M / TiO2光催化剂（M = Pd，Pt，Au）的性能。使用Degussa P25 TiO2制备光催化剂，其中金属负载量为Pd 0.5和1 wt。％，Pt 1 wt。％和Au 1 wt。％。 TEM，UV-Vis，XPS和EXAFS分析证实，分别存在的Pd / TiO2，Pt / TiO2和Au / TiO2的负载金属纳米粒子的尺寸分别类似于2、1.3和5.4 nm。光致发光数据表明，光激发后，金属助催化剂有效地抑制了TiO2中的电子-空穴对重组。在紫外线（365 nm，5 mW cm（-2））下，在各种醇水混合物（酒精浓度为10 vol。％）中评估了用于生产Hy的M / TiO2光催化剂的活性。醇-水混合物中H-2的产生速率取决于（i）金属助催化剂; （ii）助催化剂的负载; （iii）酒精类型。助催化剂活性遵循Pd> Pt近似于Au的顺序。在甘油-水混合物（47.5 mmol g（-1）h（-1））和1,2-乙二醇-水混合物（44.5 mmol g（1）中，1 wt。％Pd / TiO2光催化剂达到最高的Hy生成率-1）h（-1））。 H2的产生率按以下顺序降低：甘油> 1,2-乙二醇> 1,2-丙二醇>甲醇>乙醇> 2-丙醇>叔丁醇水。对于每种M / TiO2光催化剂，在H2的产生速率与特定的醇性质（尤其是醇极性和醇氧化电位的指数）之间建立了相关性。 （C）2015 Elsevier Inc.保留所有权利。

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