Hydrogen generation by ethanol steam reforming over Rh/Al2O3 and Rh/CeZrO2 catalysts: A comparative study

Sharma, Pankaj Kumar; Saxena, Navin; Roy, Prasun Kumar; Bhatt, Arti

doi:10.1016/j.ijhydene.2015.09.137

Cited by 48 publications

(15 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From these, Rh has shown to be one of the most promising alternatives since it readily dissociates the ethanol C-C bond. Nevertheless, despite their high activity, Rh catalysts can also deactivate due to carbon deposition, as has been reported by Sharma et al [12]. The deactivation by coke formation can be overcome with oxygen addition on the flow or increasing the operating temperature.…”

Section: Introductionmentioning

confidence: 89%

“…In the past years, there has been continuous research to develop commercial catalysts. Systems such as non-noble (Co, Cu, Ni, Fe) [6][7][8][9][10][11] and noble transition metals (Pt, Pd, and Rh) [11][12][13][14][15][16][17] have been tested in the ESR. From these, Rh has shown to be one of the most promising alternatives since it readily dissociates the ethanol C-C bond.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of the Structural and Electronic Properties of Rh/CeXZr1-XO2 Catalysts on the Low-temperature Ethanol Steam-reforming

et al. 2021

View full text Add to dashboard Cite

Abstract. Rh catalysts supported on CexZr1–xO2 (with x= 0-1) materials were synthesized by precipitation method. The influence of the two different cerium salt precursors, ammonium cerium(IV) nitrate and cerium(III) nitrate hexahydrate, over the structure and catalytic activity in steam reforming reaction was investigated. The synthesized catalysts were characterized by various techniques, such as N2 adsorption-desorption, temperature-programmed desorption, X-ray diffraction, Raman spectroscopy, diffuse reflectance UV-Vis, and X-ray photoelectron spectroscopy. The use of ammonium cerium (IV) nitrate as a cerium precursor resulted in solid CexZr1-xO2 solutions with improved oxygen mobility and specific surface area. The catalytic evaluation exhibited the support composition and structure impact on its activity and product yield. The Rh supported on Ce0.5Zr0.5O2 solid solution rendered the higher activity and H2 and CO2 yields among both series, related to improved oxygen mobility and greater Rh0 dispersion. The formation of surface defects adjacent to Rh clusters by strong metal-support interaction effect was suggested by Raman analysis. The close contact between the Rh0 site and oxygen vacancy could be favoring cyclic-like ethanol adsorption and favored the breaking of the C–C bond and further oxidation of adsorbed CO and CHX species. Resumen. Los catalizadores de Rh soportados en materiales CexZr1 – xO2 (x= 0-1) se sintetizaron mediante el método de precipitación. En este trabajo se investiga la influencia de dos precursores de sal de cerio diferentes, nitrato de amonio cerio (IV) y nitrato de cerio (III) hexahidrato, sobre la estructura y la actividad catalítica en la reacción de reformado con vapor. Los catalizadores sintetizados se caracterizaron mediante diversas técnicas, tal como fisisorción de N2, reducción a temperatura programada, difracción de rayos X, espectroscopía Raman, reflectancia difusa UV-Vis y espectroscopía de fotoelectrones de rayos X. El uso de nitrato de amonio cerio (IV) como precursor de cerio dio como resultado la obtención de soluciones sólidas de CexZr1-xO2 con una movilidad del oxígeno y área específica mejorada. La evaluación catalítica mostró el impacto de la composición y estructura del soporte sobre la conversión y rendimiento de productos. El catalizador Rh soportado en la solución sólida Ce0.5Zr0.5O2 proporcionó la mayor actividad y rendimientos de H2 y CO2 entre ambas series, relacionados con la movilidad del oxígeno mejorada y mayor dispersión de Rh0. El análisis Raman sugirió la formación de defectos superficiales adyacentes a los grupos de Rh debido a fuertes interacciones metal-soporte. El contacto estrecho entre el sitio Rh0 y la vacante de oxígeno estaría favoreciendo la adsorción del etanol en configuración cíclica y favoreciendo la ruptura del enlace C-C y la oxidación de las especies de CO y CHX adsorbidas.

show abstract

Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Effect of the Structural and Electronic Properties of Rh/CeXZr1-XO2 Catalysts on the Low-temperature Ethanol Steam-reforming

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Up to now the noble metal (rhodium, platinum, ruthenium or iridium) catalysts have been applied in this process with good results [9][10][11][12]. Due to the high cost of precious metals, numerous efforts are undertaken to develop cheaper catalysts with comparable properties.…”

Section: Introductionmentioning

confidence: 99%

Investigation on binary copper-based catalysts used in the ethanol steam reforming process

Hamryszak

Madej-Lachowska

Kulawska

et al. 2020

Reac Kinet Mech Cat

View full text Add to dashboard Cite

The use of copper-based binary catalysts, Cu/Zr oxides and Cu/Al oxides, has been examined to produce hydrogen from ethanol in the ethanol steam reforming process. The examined catalysts were compared with non-noble bicomponent catalysts consisting of oxides of nickel and cobalt: Ni/Zr Co/Zr, Ni/Al and Co/Al, prepared and tested in the identical way. Catalytic tests were carried out in the fixed-bed reactor in the temperature range 433-873 K for initial molar ratio of ethanol to water equal to 1:3. Ethanol conversion approached near 100%. Catalysts were characterized by XRD, TPR. Cu/Zr oxides . The catalyst showed very good selectivity. It is significant that carbon monoxide appeared only above 600 K and its selectivity has not exceeded 3% in the higher temperature range. No methane has been detected. Hydrogen yield was relatively stable in the temperature range from 513 to 873 K. Similarly, in the presence of Cu/Al oxides neither CO nor CH 4 were found in the products. The correlation between activity of examined catalysts and textural properties was not found.

show abstract

“…Among the large amount of chemical compounds that can be obtained from biomass, ethanol could be an excellent option to produce hydrogen through its steam reforming due to the environmental benefits that it entails, such as the near zero carbon dioxide (CO2) emissions, what could help to combat the climate change [6][7][8]. For that reason, numerous studies have been focused on the design, development and optimization of catalytic materials for ethanol steam reforming (ESR) [9][10][11][12][13][14][15][16][17][18][19]. Among them, Co-based catalysts are widely accepted due to their appropriate low-cost compared to precious metals [20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Valorization of alcoholic wastes from the vinery industry to produce H2

Hernández-Soto

Costa-Serra

Carratalá

et al. 2019

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

This paper focuses on the development of active and stable catalysts for the steam reforming of alcoholic wastes. Two catalysts with high activity in the steam reforming of ethanol have been studied in the steam reforming of an alcoholic waste from the vinery industry, as previous step to their industrial scale up. The catalysts are based on cobalt supported on Zn-hydrotalcite-derived material and natural sepiolite. At laboratory level, the catalytic material based on natural sepiolite showed the best catalytic performance maintaining its catalytic activity for more than 160 hours in presence of 50 ppm of sulfur contained in the alcoholic waste. Thus, sepiolite based catalyst was scaled up to prepare a first generation of catalytic monoliths. The reforming activity of this first generation of monoliths was found lower than their corresponding powdered catalyst. The high calcination temperature (1573 K) used in the manufacture of the first generation of monoliths was the responsible of their low performance, which was related to the sintering of cobalt catalyst in a larger crystallite size of metallic cobalt. A second generation of monoliths was prepared using a lower calcination temperature (873 K). Now, the monoliths exhibited a high catalytic performance, similar to the powdered catalyst. The excellent results obtained with the second generation of monoliths have been protected under an invention patent (E201731077). This is the first time that catalytic monoliths based on natural sepiolite promoted with Co are successfully manufactured and tested in the steam reforming of alcoholic wastes from the distillery industry to produce hydrogen.

show abstract

Hydrogen generation by ethanol steam reforming over Rh/Al2O3 and Rh/CeZrO2 catalysts: A comparative study

Cited by 48 publications

References 57 publications

Effect of the Structural and Electronic Properties of Rh/CeXZr1-XO2 Catalysts on the Low-temperature Ethanol Steam-reforming

Effect of the Structural and Electronic Properties of Rh/CeXZr1-XO2 Catalysts on the Low-temperature Ethanol Steam-reforming

Investigation on binary copper-based catalysts used in the ethanol steam reforming process

Valorization of alcoholic wastes from the vinery industry to produce H2

Contact Info

Product

Resources

About