In situ DRIFT-mass spectrometry study of the ethanol steam-reforming reaction over carbonyl-derived Co/ZnO catalysts

2004 ◽  
Vol 227 (2) ◽  
pp. 556-560 ◽  
Author(s):  
Jordi Llorca ◽  
Narcís Homs ◽  
Pilar Ramirez de la Piscina
Keyword(s):  
Mass Spectrometry ◽  
Steam Reforming ◽  
Ethanol Steam Reforming ◽  
Mass Spectrometry Study ◽  
In Situ Drift ◽  
Ethanol Steam

Catalytic behavior of unsupported Co materials in the reformation of ethanol to hydrogen: An in situ diffuse reflectance infrared Fourier transform (DRIFT)-mass spectrometry study

2008 ◽  
Vol 80 (11) ◽  
pp. 2397-2403 ◽  
Author(s):  
Salvador Martí ◽  
Narcís Homs ◽  
Evandro Brum Pereira ◽  
Pilar Ramírez de la Piscina
Keyword(s):  
Mass Spectrometry ◽  
Steam Reforming ◽  
Diffuse Reflectance ◽  
Ethanol Steam Reforming ◽  
Hydroxyl Groups ◽  
Subsequent Formation ◽  
Co Catalysts ◽  
Diffuse Reflectance Infrared ◽  
Ethanol Steam

New unsupported Co catalysts were studied in the ethanol steam-reforming reaction by in situ diffuse reflectance infrared spectroscopy and on-line mass spectrometry (MS) techniques. The initial ethoxy surface species evolved to surface-acyl species and to acetaldehyde intermediate at temperatures ca. 473 K. The subsequent formation of surface-acetate species occurs at ca. 573 K. Further, the acetate species mainly evolve above 573 K to H2 and CO2 products. The route to ketone formation was inhibited on these materials. The presence of surface-hydroxyl groups, which are probably related to the formation of a CoO phase under the reforming conditions, was determined. Alkaline addition shows a beneficial effect on the ethanol steam-reforming over bulk Co catalysts.

In situ IR spectroscopy study of ethanol steam reforming in the presence of Pt–Ru/DND nanocatalysts

2017 ◽  
Vol 12 (5-6) ◽  
pp. 315-325 ◽  
Author(s):  
G. N. Bondarenko ◽  
M. M. Ermilova ◽  
M. N. Efimov ◽  
L. M. Zemtsov ◽  
G. P. Karpacheva ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Steam Reforming ◽  
Ethanol Steam Reforming ◽  
Spectroscopy Study ◽  
In Situ Ir ◽  
Ethanol Steam ◽  
In Situ Ir Spectroscopy

Mechanism of Ethanol Steam Reforming Over Pt/(Ni+Ru)-Promoted Oxides by FTIRS In Situ

2016 ◽  
Vol 59 (15-16) ◽  
pp. 1332-1342 ◽  
Author(s):  
Vladislav A. Sadykov ◽  
Olga V. Chub ◽  
Yurii A. Chesalov ◽  
Natalia V. Mezentseva ◽  
Svetlana N. Pavlova ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Ethanol Steam Reforming ◽  
Ethanol Steam

scholarly journals Promoting the Selectivity of Pt/m-ZrO2 Ethanol Steam Reforming Catalysts with K and Rb Dopants

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2233
Author(s):  
Michela Martinelli ◽  
Richard Garcia ◽  
Caleb D. Watson ◽  
Donald C. Cronauer ◽  
A. Jeremy Kropf ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Ethanol Steam Reforming ◽  
Catalyst Composition ◽  
Reforming Catalysts ◽  
Hydrogen Selectivity ◽  
Temperature Programmed ◽  
Diffuse Reflectance Infrared ◽  
Temperature Programmed Reaction ◽  
Ethanol Steam

The ethanol steam reforming reaction (ESR) was investigated on unpromoted and potassium- and rubidium-promoted monoclinic zirconia-supported platinum (Pt/m-ZrO2) catalysts. Evidence from in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) characterization indicates that ethanol dissociates to ethoxy species, which undergo oxidative dehydrogenation to acetate followed by acetate decomposition. The acetate decomposition pathway depends on catalyst composition. The decarboxylation pathway tends to produce higher overall hydrogen selectivity and is the most favored route at high alkali loading (2.55 wt.% K and higher or 4.25 wt.% Rb and higher). On the other hand, decarbonylation is a significant route for the undoped catalyst or when a low alkali loading (e.g., 0.85% K or 0.93% Rb) is used, thus lowering the overall H2 selectivity of the process. Results of in situ DRIFTS and the temperature-programmed reaction of ESR show that alkali doping promotes forward acetate decomposition while exposed metallic sites tend to facilitate decarbonylation. In previous work, 1.8 wt.% Na was found to hinder decarbonylation completely. Due to the fact that 1.8 wt.% Na is atomically equivalent to 3.1 wt.% K and 6.7 wt.% Rb, the results show that less K (2.55% K) or Rb (4.25% Rb) is needed to suppress decarbonylation; that is, more basic cations are more efficient promoters for improving the overall hydrogen selectivity of the ESR process.

scholarly journals Unraveling the Chemical State of Cobalt in Co-Based Catalysts during Ethanol Steam Reforming: an in Situ Study by Near Ambient Pressure XPS and XANES

ACS Catalysis ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 9625-9636 ◽  
Author(s):  
Cristián Huck-Iriart ◽  
Lluís Soler ◽  
Albert Casanovas ◽  
Carlo Marini ◽  
Jordi Prat ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Ambient Pressure ◽  
Chemical State ◽  
Ethanol Steam Reforming ◽  
In Situ Study ◽  
Ambient Pressure Xps ◽  
Ethanol Steam ◽  
Near Ambient Pressure Xps

Ni particles generated in situ from spinel structures used in ethanol steam reforming reaction

2020 ◽  
Vol 15 ◽  
pp. 100213 ◽  
Author(s):  
M. Nuñez Meireles ◽  
J.A. Alonso ◽  
M.T. Fernández Díaz ◽  
L.E. Cadús ◽  
F.N. Aguero
Keyword(s):  
Steam Reforming ◽  
Ethanol Steam Reforming ◽  
Spinel Structures ◽  
Ethanol Steam
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