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Preparation and photocatalytic activity of Au/TiO2 lyogels for hydrogen production†
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2018-08-03 00:00:00 , DOI: 10.1039/c8se00293b Lester Martínez 1, 2, 3, 4, 5 , Mónica Benito 6, 7, 8, 9 , Ignasi Mata 6, 7, 8, 9, 10 , Lluís Soler 1, 2, 3, 4, 5 , Elies Molins 6, 7, 8, 9 , Jordi Llorca 1, 2, 3, 4, 5
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2018-08-03 00:00:00 , DOI: 10.1039/c8se00293b Lester Martínez 1, 2, 3, 4, 5 , Mónica Benito 6, 7, 8, 9 , Ignasi Mata 6, 7, 8, 9, 10 , Lluís Soler 1, 2, 3, 4, 5 , Elies Molins 6, 7, 8, 9 , Jordi Llorca 1, 2, 3, 4, 5
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High surface area titania lyogels have been prepared, thermally transformed into TiO2 polymorphs at 400–850 °C, and decorated by ball milling with preformed Au nanoparticles of ca. 2 nm to ensure the same contact points at the metal–support interphase. The best performance in the photogeneration of hydrogen from gaseous water–ethanol under dynamic conditions in a fixed bed reactor has been obtained with the lyogel calcined at 550 °C, with a hydrogen photoproduction rate of 19.8 mmol H2 g−1 h−1 under an irradiance of 80 mW cm−2 and GHSV = 26 000 h−1. This photocatalyst contains 84% anatase and 16% rutile polymorphs, very similar to the standard P25. A series of photocatalysts prepared by lyophilization of a mixture of the titania gel and the preformed Au nanoparticles and calcination under the same conditions has resulted in samples with Au nanoparticles up to 18 nm strongly interacting with TiO2. The presence of Au nanoparticles in the composite lyogel has strongly retarded the transformation of anatase into rutile. The results have shown that the TiO2 polymorph has a greater influence than the Au nanoparticle size on the photoproduction of hydrogen.
中文翻译：
Au / TiO 2凝胶的制备及其对产氢的光催化作用†
制备了高表面积的二氧化钛溶胶，在400–850°C下热转化为TiO 2多晶型，并通过球磨与预先形成的约Au纳米金进行装饰。2 nm以确保在金属-载体间相上的接触点相同。在从动态条件下是气态的水-乙醇的氢在固定床反应器中的光生最好的性能已在550℃下煅烧的液凝胶获得的，具有19.8毫摩尔的氢光生速率ħ 2克-1 ħ -1下辐照度为80 mW cm -2，GHSV = 26 000 h -1。这种光催化剂包含84％的锐钛矿和16％的金红石多晶型物，与标准P25非常相似。通过将二氧化钛凝胶和预先形成的Au纳米颗粒的混合物冻干并在相同条件下煅烧制备的一系列光催化剂导致样品中高达18 nm的Au纳米颗粒与TiO 2发生强相互作用。复合液凝胶中金纳米颗粒的存在强烈阻碍了锐钛矿向金红石的转化。结果表明，TiO 2多晶型物对金的光产生的影响大于Au纳米粒子的大小。
更新日期：2018-08-03
中文翻译：
Au / TiO 2凝胶的制备及其对产氢的光催化作用†
制备了高表面积的二氧化钛溶胶，在400–850°C下热转化为TiO 2多晶型，并通过球磨与预先形成的约Au纳米金进行装饰。2 nm以确保在金属-载体间相上的接触点相同。在从动态条件下是气态的水-乙醇的氢在固定床反应器中的光生最好的性能已在550℃下煅烧的液凝胶获得的，具有19.8毫摩尔的氢光生速率ħ 2克-1 ħ -1下辐照度为80 mW cm -2，GHSV = 26 000 h -1。这种光催化剂包含84％的锐钛矿和16％的金红石多晶型物，与标准P25非常相似。通过将二氧化钛凝胶和预先形成的Au纳米颗粒的混合物冻干并在相同条件下煅烧制备的一系列光催化剂导致样品中高达18 nm的Au纳米颗粒与TiO 2发生强相互作用。复合液凝胶中金纳米颗粒的存在强烈阻碍了锐钛矿向金红石的转化。结果表明，TiO 2多晶型物对金的光产生的影响大于Au纳米粒子的大小。
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