Bioethanol steam reforming over monoliths washcoated with RhPt/CeO2–SiO2: The use of residual biomass to stably produce syngas

Cifuentes, Bernay; Gómez, July; Sánchez, Néstor; Proaño, Laura; Bustamante, Felipe; Cobo, Martha

doi:10.1016/j.ijhydene.2020.10.271

Cited by 22 publications

(7 citation statements)

References 58 publications

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“…In this process, the inlet ethanol content, alembic load, and S/E was assessed. Afterwards, ethanol is purified through batch distillation, the resulting bioethanol is converted into syngas over monoliths washcoated with RhPt/CeO 2 -SiO 2 at temperatures between 600 • C and 700 • C. At these conditions, complete conversion of ethanol is attained [18]. The resulting syngas is then cooled down and sent to the CO-removal reactor which operates between 200 and 300 • C and packed with a monolith washcoated with Au-Cu/CeO 2 to remove CO [31].…”

Section: Resultsmentioning

confidence: 99%

“…Aside from the S/E and ESR temperature, the carrier gas is a critical hotspot on the production of power from ethanol [5] and strongly influences the syngas profile. For instance, Cifuentes et al [18] reported that low carrier gas ratios (i.e., liters of carrier gas per mL of bioethanol) will decrease the H 2 yield during ESR over monoliths washcoated with RhPt/CeO 2 -SiO 2 . The use of a carrier gas will influence the process efficiency since higher energy consumption will be attained.…”

Section: Discussionmentioning

confidence: 99%

“…The kinetic parameters make it possible to forecast the behavior of H 2 and CO yield over monoliths washcoated with RhPt/CeO 2 -SiO 2 at temperatures between 600 and 700 • C since the student's statistical t-test showed that there was no significant difference between the experimental and Aspen Plus ® results according to Table S2.3 (See Supplementary Material S2). Those temperatures were selected to guarantee that ethanol conversion was complete [18].…”

Section: Ethanol Steam Reformingmentioning

confidence: 99%

“…Due to the endothermicity of the steam reforming reaction, higher temperature favors ethanol conversion into H 2 [17]. Cifuentes et al [18] designed a monolith washcoated with RhPt/CeO 2 -SiO 2 for producing H 2 from bioethanol via ESR. This catalyst produces at least 60 mol.% H 2 during 50 h time on stream through the ESR of bioethanol coming from the fermentation of biomass.…”

Section: Introductionmentioning

confidence: 99%

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Biomass Potential for Producing Power via Green Hydrogen

et al. 2021

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Hydrogen (H2) has become an important energy vector for mitigating the effects of climate change since it can be obtained from renewable sources and can be fed to fuel cells for producing power. Bioethanol can become a green H2 source via Ethanol Steam Reforming (ESR) but several variables influence the power production in the fuel cell. Herein, we explored and optimized the main variables that affect this power production. The process includes biomass fermentation, bioethanol purification, H2 production via ESR, syngas cleaning by a CO-removal reactor, and power production in a high temperature proton exchange membrane fuel cell (HT-PEMFC). Among the explored variables, the steam-to-ethanol molar ratio (S/E) employed in the ESR has the strongest influence on power production, process efficiency, and energy consumption. This effect is followed by other variables such as the inlet ethanol concentration and the ESR temperature. Although the CO-removal reactor did not show a significant effect on power production, it is key to increase the voltage on the fuel cell and consequently the power production. Optimization was carried out by the response surface methodology (RSM) and showed a maximum power of 0.07 kWh kg−1 of bioethanol with an efficiency of 17%, when ESR temperature is 700 °C. These values can be reached from different bioethanol sources as the S/E and CO-removal temperature are changed accordingly with the inlet ethanol concentration. Because there is a linear correlation between S/E and ethanol concentration, it is possible to select a proper S/E and CO-removal temperature to maximize the power generation in the HT-PEMFC via ESR. This study serves as a starting point to diversify the sources for producing H2 and moving towards a H2-economy.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Ethanol Steam Reformingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Biomass Potential for Producing Power via Green Hydrogen

et al. 2021

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“…In fact, raw bioethanol contains several organic and inorganic impurities, which were shown to strongly affect the catalyst deactivation rate due to coke formation during steam reforming [19,20]. For example, it was reported [21] that the carbon formation rate increases by almost 15% during ethanol steam reforming over a RhPt/CeO 2 -SiO 2 catalyst at 700 • C when the reacting stream is switched from synthetic ethanol to glucose bioethanol.…”

Section: Catalytic Formulationsmentioning

confidence: 99%

The Route from Green H2 Production through Bioethanol Reforming to CO2 Catalytic Conversion: A Review

et al. 2022

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Currently, a progressively different approach to the generation of power and the production of fuels for the automotive sector as well as for domestic applications is being taken. As a result, research on the feasibility of applying renewable energy sources to the present energy scenario has been progressively growing, aiming to reduce greenhouse gas emissions. Following more than one approach, the integration of renewables mainly involves the utilization of biomass-derived raw material and the combination of power generated via clean sources with conventional power generation systems. The aim of this review article is to provide a satisfactory overview of the most recent progress in the catalysis of hydrogen production through sustainable reforming and CO2 utilization. In particular, attention is focused on the route that, starting from bioethanol reforming for H2 production, leads to the use of the produced CO2 for different purposes and by means of different catalytic processes, passing through the water–gas shift stage. The newest approaches reported in the literature are reviewed, showing that it is possible to successfully produce “green” and sustainable hydrogen, which can represent a power storage technology, and its utilization is a strategy for the integration of renewables into the power generation scenario. Moreover, this hydrogen may be used for CO2 catalytic conversion to hydrocarbons, thus giving CO2 added value.

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Structure sensitivity of ethanol steam reforming over the Rh catalyst: Reaction kinetics and deactivation mechanisms

Yang

2023

Applied Surface Science

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Bioethanol steam reforming over monoliths washcoated with RhPt/CeO2–SiO2: The use of residual biomass to stably produce syngas

Cited by 22 publications

References 58 publications

Biomass Potential for Producing Power via Green Hydrogen

Biomass Potential for Producing Power via Green Hydrogen

The Route from Green H2 Production through Bioethanol Reforming to CO2 Catalytic Conversion: A Review

Structure sensitivity of ethanol steam reforming over the Rh catalyst: Reaction kinetics and deactivation mechanisms

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