Towards the sustainable hydrogen production by catalytic conversion of C-laden biorefinery aqueous streams

Pipitone, Giuseppe; Zoppi, Giulia; Ansaloni, Simone; Bocchini, Sergio; Pirone, Raffaele; Bensaid, Samir

doi:10.1016/j.cej.2018.12.137

Cited by 25 publications

(22 citation statements)

References 32 publications

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“…This suggested that the adsorbed decarboxylated hexuronic acid further undergoes breakage and oxidation to give various mono- and bicarboxylic acids and hydroxyacids. The formation of these acids was also reported in two past works. , According to Pipitone et al, acetic acid is adsorbed on Pt sites and then decarboxylated to release CO 2 . Methane is formed by the recombination of CH 3ads and H ads species.…”

Section: Resultssupporting

confidence: 59%

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Hydrogen Production by Reforming of Sodium Alginate in the Liquid Phase over Pt/C Catalyst

Kalekar

Vaidya

2021

Ind. Eng. Chem. Res.

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Wet biomass such as macroalgae (or seaweeds) can be effectively converted into a H 2 -rich gaseous product by catalytic reforming in the liquid phase. Sodium alginate (SA)a major constituent of such biomasswas chosen as the model compound for this study on aqueous-phase reforming (APR). Trials were performed in the 200−230 °C range in a stirred batch reactor for up to 6 h using different alginate concentrations (0.5−2.5 wt %) in aqueous solutions. Low-molecular-weight organic acids such as acetic, propionic, lactic, and succinic acids and gaseous product comprising H 2 , CH 4 , CO, and CO 2 were formed. Contrary to the noncatalytic process, H 2 was selectively produced over commercial 5% Pt/C catalyst for loadings between 2 and 6 kg/m 3 . After 3 h of reaction over Pt/C at T = 225 °C, the values of carbon conversion into gas phase (X) and selectivity to H 2 (S-H 2 ) and H 2 yield (Y-H 2 ) were 9.7, 32.5, and 1.4% respectively. Other noble metals were also tested; however, Pt/C performed better than Ru/C and Pd/C. Several features of Pt/C were investigated using electron microscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy, and NH 3 -temperature-programmed desorption techniques. A possible reaction scheme for alginate conversion to products was discussed. Despite the low H 2 yield, this work provided the desired starting point for improved macroalgae-to-H 2 conversions via APR.

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Section: Resultssupporting

confidence: 59%

“…The presence of H 2 is probably due to recombination of the adsorbed H on the Pt catalyst. Two adsorbed species, HO–CH 2 –(CHOH) 3 –CHOH ads and H ads , recombine to form alcohols that are further oxidized into acids …”

Section: Resultsmentioning

confidence: 99%

Hydrogen Production by Reforming of Sodium Alginate in the Liquid Phase over Pt/C Catalyst

Kalekar

Vaidya

2021

Ind. Eng. Chem. Res.

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“…On the other hand, methane was found in the gas phase, which was attributed to methanation of CO and CO 2 . Pipitone et al (2019) studied the aqueous phase reforming of butanol with a Pt-based catalyst in a batch system. The produced gas phase contained hydrogen carbon-dioxide and propane in a 2-1-1 molar ratio, in accordance with the previous works on C3 alcohols (Godina et al, 2018).…”

Section: Mass Transfer Criteriamentioning

confidence: 99%

Influence of the Catalyst Particle Size on the Aqueous Phase Reforming of n-Butanol Over Rh/ZrO2

2020

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Butanol is a by-product obtained from biomass that can be valorized through aqueous phase reforming. Rh/ZrO 2 catalysts were prepared and characterized, varying the size of the support particles. The results showed a relatively mild effect of internal mass transport on butanol conversion. However, the influence of internal transport limitations on the product distribution was much stronger, promoting consecutive reactions, i.e., dehydrogenation, hydrogenolysis, and reforming of propane and ethane. Hydrogen consuming reactions, i.e., hydrogenolysis, were more strongly enhanced than hydrogen producing reactions due to internal concentration gradients. Large support particles deactivated faster, attributed to high concentrations of butyraldehyde inside the catalyst particles, enhancing deposit formation via aldol condensation reactions. Consequently, also the local butyric acid concentration was high, decreasing the local pH, enhancing Rh leaching. The influence of internal transfer limitation on product distribution and stability is discussed based on a reaction scheme with three main stages, i.e., (1) formation of liquid intermediates via dehydrogenation, (2) formation of gas via decarbonylation/decarboxylation reactions, and (3) hydrocarbon hydrogenolysis/reforming/dehydrogenation.

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“…An extensive screening of representative molecules of a post-hydrothermal process side stream has been performed with the aim of producing a gas mixture rich in hydrogen by catalytic APR [4]. The paper enlightens possible routes of valorization of these byproducts, scarcely investigated with other processes so far.…”

Section: Towards the Sustainable H2 Production By Catalytic Conversion Of C-laden Biorefinery Aqueous Streamsmentioning

confidence: 99%

Novel Process to Convert Wet and Dry Organic Feedstocks into 2nd Generation Biofuels: A Scientific Review of the Heat-to-Fuel Project

Pastor‐Pérez¹,

Aranda²,

Loureiro³

2020

The 8th Annual International Sustainable Places Conference (SP2020) Proceedings

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Heat-to-Fuel is a 48-month research and innovation project, funded under the European Union’s Horizon 2020 (EU H2020) Framework Program, which the main objective is to deliver the next generation of biofuel production technologies supporting the decarbonization of the transportation sector by integrating its novel technologies together with innovative activities on design, modeling, development of hardware and processes, testing and life cycle analysis of a fully integrated system. The Heat-to-Fuel concept consists of a biorefinery that combines hydrothermal liquefaction, aqueous phase reforming and Fischer–Tropsch processes to convert wet and solid organic wastes into 2nd generation biofuels with the highest efficiency. Having reached almost 75% of the Heat-to-Fuel project’s execution, a review on the main research outcomes and publications derived from the Heat-to-Fuel project activities are presented within this paper.

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Towards the sustainable hydrogen production by catalytic conversion of C-laden biorefinery aqueous streams

Cited by 25 publications

References 32 publications

Hydrogen Production by Reforming of Sodium Alginate in the Liquid Phase over Pt/C Catalyst

Hydrogen Production by Reforming of Sodium Alginate in the Liquid Phase over Pt/C Catalyst

Influence of the Catalyst Particle Size on the Aqueous Phase Reforming of n-Butanol Over Rh/ZrO2

Novel Process to Convert Wet and Dry Organic Feedstocks into 2nd Generation Biofuels: A Scientific Review of the Heat-to-Fuel Project

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