Production of hydrogen from gas-phase ethanol dehydrogenation over iron-grafted mesoporous Pt/TiO2 photocatalysts

被引：9

作者：

Garcia-Munoz, Patricia ^{[1
]}

Zussblatt, Niels P. ^{[2
]}

Chmelka, Bradley F. ^{[2
]}

de la Pena O'Shea, Victor A. ^{[3
]}

Fresno, Fernando ^{[3
,4
]}

机构：

[1] Univ Politecn Madrid, Dept Ind Chem & Environm Engn, Escuela Tecn Super Ingenieros Ind ETSII, Madrid 28006, Spain

[2] Univ Calif Santa Barbara, Dept Chem Engn, Santa Barbara, CA 93106 USA

[3] IMDEA Energy, Photoactivated Proc Unit, Madrid 28935, Spain

[4] CSIC, Inst Catalisis & Petroleoquim, Madrid 28049, Spain

来源：

CHEMICAL ENGINEERING JOURNAL | 2022年 / 450卷

基金：

欧洲研究理事会;

关键词：

Photocatalysis; Hydrogen; Mesoporous titania; Iron oxide; Acetaldehyde; Ethanol; LIQUID;

D O I：

10.1016/j.cej.2022.138450

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

We report the photocatalytic activity of iron-grafted mesoporous Pt/TiO2 catalysts, combining the properties of heterojunction photocatalysts with mesopomsity, for the gas-phase production of hydrogen from water-ethanol mixtures. GC-MS analysis reveals a preferential ethanol dehydrogenation reaction pathway, resulting in the formation of acetaldehyde with high selectivity versus carbon dioxide, for all of the catalysts investigated. Multi-technique characterization reveals that, in all the iron-grafted samples, Fe is located predominantly on the surfaces of the catalysts as Fe2O3 rather than doping the anatase structure, while the mesoporosity of the starting TiO2 is preserved. Among the different materials, the activity for photocatalytic ethanol dehydrogenation is optimum in the catalyst with the lowest iron content. According to XPS and time-resolved fluorescence measurements, this can be accounted for by higher Fe surface dispersion and consequent efficient formation of a surface heterojunction between Fe2O3 and TiO2 that favours charge separation.

引用

页数：7

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