H2 Photoproduction Efficiency: Implications of the Reaction Mechanism as a Function of the Methanol/Water Mixture

被引:1
作者
Barba-Nieto, Irene [1 ,2 ]
Colon, Gerardo [3 ]
Kubacka, Anna [1 ]
Fernandez-Garcia, Marcos [1 ]
机构
[1] CSIC, Inst Catalisis & Petr Quim, Madrid 28049, Spain
[2] Univ Complutense Madrid, Fac Ciencias Quim, Dept Quim Fis, Madrid 28040, Spain
[3] Univ Seville, Inst Ciencia Mat Sevilla, Ctr Mixto, CSIC, C Amer Vespucio 49, Seville 41092, Spain
关键词
H-2; quantum efficiency; fraction of useful photons; mechanism; QUANTUM EFFICIENCY; RADIATION ABSORPTION; OPTICAL-PROPERTIES; HYDROGEN; TIO2; PHOTOCATALYSIS; PERFORMANCE; CATALYSIS; UV; PD;
D O I
10.3390/catal12040402
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The influence of the reaction pathway of the sacrificial molecule oxidation to generate hydrogen is here investigated for lean and rich methanol reaction mixtures. Pt-TiO2 powders promoted or not with tin sulfide were used as catalysts. With the help of in situ infrared experiments under reaction conditions, methanol evolution was shown to take place by hole-related oxidation steps, with alkoxy and carbon-centered species as key radical species. The study analyzed quantitatively the fate and chemical use of the photons absorbed by the solids with the help of the quantum efficiency and the useful fraction of photons observables. Within this framework, the role of the sulfide component to promote photoactivity is interpreted, braiding chemical and photonic information.
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页数:18
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