Hydrogen Production from Methane and Water on Platinum Loaded Titanium Oxide Photocatalysts
Hydrogen Production from Methane and Water on Platinum Loaded Titanium Oxide Photocatalysts
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DOI：
10.1021/jp077314u
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发表时间：
2008-03
影响因子：
3.7
通讯作者：
H. Yoshida;K. Hirao;J. Nishimoto;Katsuya Shimura;S. Kato;H. Itoh;T. Hattori
中科院分区：
文献类型：
--
作者：
H. Yoshida;K. Hirao;J. Nishimoto;Katsuya Shimura;S. Kato;H. Itoh;T. Hattori
研究了室温（约100 ℃）下Pt/TiO 2光催化CH 4气体与H2O蒸气的反应。323 K）。H2和CO2是主要产物，并且还观察到仅痕量的C2 H6和CO。在诱导期之后，出口气体中H2与CO2的摩尔比变得接近4。因此，主反应被建议为方程CH 4 + 2 H2O（g）→ 4 H2 + CO2，这可以被称为甲烷的光催化蒸汽重整（光催化SRM），其中光能被转换为产物的化学势（= 113 kJ mol-1）。该反应将被光激发的电子和空穴，这是由带隙光激发的TiO 2光催化剂产生的促进。在高强度光（60 mW cm-2）下，345 - 385 nm范围内的表观量子产率为0.6%，而在低强度光（2 mW cm-2）下，240 - 270 nm范围内的表观量子产率达到2%。高活性Pt/TiO 2光催化剂由具有大比表面积和足够负载量的α-TiO 2组成。
Photocatalytic reaction of CH4 gas with H2O vapor was examined over Pt/TiO2 around room temperature (ca. 323 K) in a flow reactor. H2 and CO2 were the main products, and only trace amounts of C2H6 and CO were also observed. After an induction period, the molar ratio of H2 to CO2 in the outlet gas became close to 4. Thus, the main reaction is suggested as the equation CH4 + 2H2O(g) → 4H2 + CO2, which can be referred to as photocatalytic steam reforming of methane (photocatalytic SRM), where the photoenergy is converted to chemical potential of products (= 113 kJ mol-1). The reaction would be promoted by photoexcited electrons and holes, which were generated by band gap photoexcitation of the TiO2 photocatalyst. The apparent quantum yield in the range 345−385 nm with high-intensity light (60 mW cm-2) was 0.6%, while the one in the range 240−270 nm with low-intensity light (2 mW cm-2) reached 2%. Highly active Pt/TiO2 photocatalysts consisted of anatase phase TiO2 having large surface area and enough loading...