Hydrogen formation in ethanol reforming on supported noble metal catalysts

Erdöhelyi, András; Raskó, J.; Kecskés, T.; Tóth, Mariann; Dömök, M.; Baán, Kornélia

doi:10.1016/j.cattod.2006.05.073

Cited by 211 publications

(171 citation statements)

References 22 publications

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“…If the surface is highly acidic, ethanol dehydration may dominate the reaction pathway and result in the formation of H 2 O and C 2 H 4 which is the major precursor to coke due to polymerization, as described in Scheme 2 and 6. If the oxygen mobility in the catalyst is not high enough, the acetate species may remain on the surface and lead to coke formation, as reported earlier [34,134]. Briefly speaking, dissociative adsorption of ethanol and water leads to ethoxide species and hydroxyl groups, respectively.…”

Section: Reaction Mechanism and Kinetic Studiesmentioning

confidence: 73%

“…However, based on the results reported in the literature, there is no commonly accepted optimal catalyst system which has excellent performance as well as low cost. The noble metal catalysts such as Rh, Ru, Pd, Pt, Re, Au, and Ir [34][35][36][37][38][39] have been extensively investigated for BESR, which exhibit promising catalytic activity within a wide range of temperatures (350 o C~800 o C) and gas hourly space velocities (GHSV: 5,000~300,000 h -1 ). The outstanding catalytic performance experienced by noble metal catalysts might be closely related to its remarkable capability in C-C bond cleavage [40].…”

Section: Catalyst Overviewmentioning

confidence: 99%

“…Although the exact locations of the ethanol adsorption bands vary with catalysts tested, the identifications of surface species and its evolutions are well established. Ethanol can be adsorbed on the sample surface dissociatively and molecularly [112][113][114]. The ethoxide species is the result of ethanol dissociative adsorption.…”

Section: Reaction Mechanism and Kinetic Studiesmentioning

confidence: 99%

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Catalytic Hydrogen Production from Bioethanol

Song

2017

Hydrogen Production Technologies

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Section: Reaction Mechanism and Kinetic Studiesmentioning

confidence: 73%

Section: Catalyst Overviewmentioning

confidence: 99%

Section: Reaction Mechanism and Kinetic Studiesmentioning

confidence: 99%

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Catalytic Hydrogen Production from Bioethanol

Song

2017

Hydrogen Production Technologies

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“…So for, SRE has been investigated over a different noble (Rh, Pt, Ru, Pd, Ir) 3, 4 and base metals (Ni, Cu, Co, Ni-Co, Ni-Cu) 5-7 and over oxide catalysts such as MgO, Al 2 O 3 , ZnO, TiO 2 , CeO 2 , V 2 O 5 or others 8, 9 . Noble based catalysts exhibit high catalytic activity over wide range of temperatures (400-600°C) in terms of hydrogen yield and ethanol conversion.…”

Section: Introductionmentioning

confidence: 99%

“…Oxide catalysts show good activity but usually insuffi cient selectivity. Among base metal catalysts, Ni-based give high ethanol conversion with high selectivity to hydrogen but CH 4 or CO content in the reaction products is comparatively high 10 . Cu-based catalysts exhibit good activity but H 2 yield is relatively low 11 .…”

Section: Introductionmentioning

confidence: 99%

Catalytic activity of cobalt and cerium catalysts supported on calcium hydroxyapatite in ethanol steam reforming

Dobosz

Hull

Zawadzki

2016

Polish Journal of Chemical Technology

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In this paper, Co,Ce/Ca 10 (PO 4 ) 6 (OH) 2 catalysts with various cobalt loadings for steam reforming of ethanol (SRE) were prepared by microwave-assisted hydrothermal and sol-gel methods, and characterized by XRD, TEM, TPR-H 2 , N 2 adsorption-desorption measurements and cyclohexanol (CHOL) decomposition tests. High ethanol conversion (close to 100%) was obtained for the catalysts prepared by both methods but these ones prepared under hydrothermal conditions (HAp-H) ensured higher hydrogen yield (3.49 mol H 2 /mol C 2 H 5 OH) as well as higher amount of hydrogen formed (up to 70%) under reaction conditions. The superior performance of 5Co,10Ce/HAp-H catalyst is thought to be due to a combination of factors, including increased reducibility and oxygen mobility, higher density of basic sites on its surface, and improved textural properties. The results also show a signifi cant effect of cobalt loading on catalysts effi ciency in hydrogen production: the higher H 2 yield exhibit catalysts with lower cobalt content, regardless of the used synthesis method.

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Hydrogen Production from Renewables

Navarro¹,

Sánchez-Sánchez²,

Álvarez-Galván³

et al. 2005

Encyclopedia of Inorganic Chemistry

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Hydrogen is considered to be critical for energy and environmental sustainability. However, as hydrogen is currently produced from fossil fuels, it emits large amounts of carbon dioxide along the reforming steps. The technical challenges to achieve a stable hydrogen economy include improving process efficiencies, lowering the cost of production, and harnessing renewable sources for hydrogen production. Lignocellulosic biomass is one of the most abundant forms of renewable resources. When this precursor is used, virtually no net greenhouse gas emissions result because a natural cycle is maintained, in which carbon is extracted from the atmosphere during plant growth and is released during hydrogen production. This article focuses on recent developments in biomass and biomass‐derived product conversion to H 2 . The second option explored here is the conversion of solar energy into hydrogen via water‐splitting processes assisted by two‐step metal‐oxide thermochemical cycles or by photosemiconductor catalysts. The conversion of solar energy into a clean fuel (H 2 ) is the most promising technology for the future because large quantities of hydrogen can potentially be generated in a clean and sustainable manner. Undoubtedly, the conversion of solar energy into H 2 is one of the greatest challenges scientists are facing in the twenty first century. A survey is presented of the advances made in the development of metal oxide redox pairs since the pioneering work by Nakamura in 1977 and in the development of photocatalysts for water splitting under visible light since the first work of Fujishima and Honda in 1972. The very high thermal reduction temperature used for the metal oxide redox pairs developed until now leads to severe sintering, melting, and vaporization of materials, decreasing the efficiency and durability in the cyclic operation. Consequently, the application of material science and engineering to the development of materials with lower reduction temperature and high water‐splitting ability is still a challenge in this scientific area and an overview of the progress is provided in this article. On the other hand, there are still major challenges in the development of photocatalysts with improved efficiencies for hydrogen production from water using solar energy. An overview is provided in this article of research strategies and approaches adopted in the search for photocatalysts for water splitting under visible light (new photocatalyst materials and the control of the synthesis of materials for customizing the crystallinity, electronic structure, and morphology of catalysts at nanometric scale).

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Hydrogen formation in ethanol reforming on supported noble metal catalysts

Cited by 211 publications

References 22 publications

Catalytic Hydrogen Production from Bioethanol

Catalytic Hydrogen Production from Bioethanol

Catalytic activity of cobalt and cerium catalysts supported on calcium hydroxyapatite in ethanol steam reforming

Hydrogen Production from Renewables

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