Renewable Hydrogen from Ethanol by Autothermal Reforming

Deluga, Gregg A.; Salge, J. R.; Schmidt, L.D.; Verykios, Xenophon E.

doi:10.1126/science.1093045

Cited by 939 publications

(595 citation statements)

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“…The overall reaction for the reforming of ethanol to hydrogen can be described as 20 Depending on the catalyst and the conditions, there are a number of pathways, including decomposition of ethanol followed by steam reforming 21 and direct steam reforming of ethanol to syngas. 22 In addition to forming CO 2 and H 2 , CO is a biproduct in these reactions, but it can react with steam over the catalyst to produce CO 2 and H 2 . This is known as the water-gas shift reaction These equations represent model reactions involving an ideal catalyst.…”

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confidence: 99%

“…For the given laser power density used in experiment, the local temperatures achieved, at least ∼408 K, may not have been high enough for optimal performance. For example, rhodium mixed with ceria supported by alumina is considered to be an excellent system for authothermal reforming of ethanol and works optimally at or above 973 K. 22 In this current work, we did not explore the mass-energy balance of the ethanol conversion. The width of our microfluidic channels was much larger than the beam waist so that much of the flowing reactants did not enter the reaction zone.…”

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Heterogenous Catalysis Mediated by Plasmon Heating

et al. 2009

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We introduce a new method for performing and miniaturizing many types of heterogeneous catalysis involving nanoparticles. The method makes use of the plasmon resonance present in nanoscale metal catalysts to provide the necessary heat of reaction when illuminated with a low-power laser. We demonstrate our approach by reforming a flowing, liquid mixture of ethanol and water over gold nanoparticle catalysts in a microfluidic channel. Plasmon heating of the nanoparticles provides not only the heat of reaction but the means to generate both water and ethanol vapor locally over the catalysts, which in turn allows the chip and the fluid lines to remain at room temperature. The measured products of the reaction, CO 2 , CO, and H 2 , are consistent with catalytic steam reforming of ethanol. The approach, which we refer to as plasmon-assisted catalysis, is general and can be used with a variety of endothermic catalytic processes involving nanoparticles.

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Heterogenous Catalysis Mediated by Plasmon Heating

et al. 2009

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“…In the recent years, much effort has been made towards the development of new synthetic routes for preparing nanostructure cerium oxides due to their potential uses in many applications, such as high-storage capacitor devices, buffer layers for conductors, fuel cells, polishing materials, UV blocks and optical devices [1][2][3][4][5][6][7] . The cerium oxide nanoparticles are prepared by various methods [8][9][10][11][12] . This paper deals with the preparation of cerium oxide nanoparticles using the precipitation method.…”

Section: Introductionmentioning

confidence: 99%

Structural, Optical, Morphological and Dielectric Properties of Cerium Oxide Nanoparticles

Prabaharan¹,

Sadaiyandi

Mahendran³

et al. 2016

Mat. Res.

158

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Cerium oxide (CeO 2 ) nanoparticles were prepared by the precipitation method. The average crystallite size of cerium oxide nanoparticles was calculated from the X-ray diffraction (XRD) pattern and found to be 11 nm. The FT-IR spectrum clearly indicated the strong presence of cerium oxide nanoparticles. Raman spectrum confirmed the cubic nature of the cerium oxide nanoparticles. The Scanning Electron Microscopy (SEM) analysis showed that the nanoparticles agglomerated forming spherical-shaped particles. The Transmission Electron Microscopic (TEM) analysis confirmed the prepared cerium oxide nanoparticles with the particle size being found to be 16 nm. The optical absorption spectrum showed a blue shift by the cerium oxide nanoparticles due to the quantum confinement effect. The dielectric properties of cerium oxide nanoparticles were studied for different frequencies at different temperatures. The dielectric constant and the dielectric loss of the cerium oxide nanoparticles decreased with increase in frequency. The AC electrical conductivity study revealed that the conduction depended on both the frequency and the temperature.

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“…La doping also enhanced the activity and stability against sintering of ceria-supported noble metal catalysts for low temperature WGS, giving an opportunity for lowering the concentration of CO in H 2 production [21,22]. The presence of CO degrades the performance of Pt electrodes in fuel cell systems [13,14].…”

Section: Introductionmentioning

confidence: 99%

Oxidative steam reforming of ethanol over Rh catalyst supported on Ce1−xLaxOy (x = 0.3) solid solution prepared by urea co-precipitation method

Han

et al. 2013

Journal of Power Sources

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h i g h l i g h t s g r a p h i c a l a b s t r a c tCeeLa solid solution supported Rh catalyst shows high activity for H 2 production. The catalyst also shows low CO selectivity and good stability. The performance of the catalysts varied depending on urea/metal ratio during preparation.a r t i c l e i n f o is prepared by a co-precipitation method using urea as a precipitant, with varying urea/metal molar ratio (N). The supported rhodium catalysts are then prepared by an impregnation method for use in hydrogen production from oxidative steam reforming (OSR) of ethanol. X-ray diffraction and Raman spectra results confirm the formation of CL, and the crystal structures of these catalysts are not very sensitive to the urea/metal molar ratios (N ¼ 5e15). However, the surface area and reducibility of the Rh/CL-N catalysts decrease monotonically with increasing N. During the OSR process, a similar tendency is also observed for ethanol conversion and hydrogen selectivity. Among the catalysts tested, Rh/CL-5 shows the best catalytic performance, achieving >97% ethanol conversion at 300 C with H 2 yield rate of 210 mmol g-cat À1 s À1 . At 450 C, its hydrogen selectivity reaches 117%, with no observable change after 72 h aging.

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Renewable Hydrogen from Ethanol by Autothermal Reforming

Cited by 939 publications

References 10 publications

Heterogenous Catalysis Mediated by Plasmon Heating

Heterogenous Catalysis Mediated by Plasmon Heating

Structural, Optical, Morphological and Dielectric Properties of Cerium Oxide Nanoparticles

Oxidative steam reforming of ethanol over Rh catalyst supported on Ce1−xLaxOy (x = 0.3) solid solution prepared by urea co-precipitation method

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