Bensaid, Samir

Chiaramonti, David

Pipitone, Giuseppe

Pirone, Raffaele

Rizzo, Andrea Maria

Zoppi, Giulia

English

PORTO@iris (Publications Open Repository TOrino - Politecnico di Torino)

18 October 2022POLITECNICO DI TORINORepository ISTITUZIONALEGreen hydrogen production from wastewater derived from lignin-rich hydrothermal liquefaction / Zoppi, Giulia; Pipitone,Giuseppe; Pirone, Raffaele; Bensaid, Samir; Rizzo, Andrea Maria; Chiaramonti, David. - ELETTRONICO. - (2021), p.479. ((Intervento presentato al convegno XXVII CONGRESSO NAZIONALE DELLA SOCIETÀ CHIMICA ITALIANA nel14-23 settembre 2021.OriginalGreen hydrogen production from wastewater derived from lignin-rich  hydrothermal liquefactionPublisher:PublishedDOI:Terms of use:openAccessPublisher copyright(Article begins on next page)This article is made available under terms and conditions as specified in the  corresponding bibliographic description inthe repositoryAvailability:This version is available at: 11583/2949635 since: 2022-01-13T11:18:18ZSocietà Chimica Italiana IND OR044  XXVII CONGRESSO NAZIONALE DELLA SOCIETÀ CHIMICA ITALIANA Green hydrogen production from wastewater derived from lignin-rich hydrothermal liquefaction  Giulia Zoppi a, Giuseppe Pipitone a, Samir Bensaid a, Andrea Maria Rizzo b,  David Chiaramonti b, c, Raffaele Pirone a a Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy. b Renewable Energy Consortium for Research and Development (RE-CORD), Viale Kennedy 182, 50038, Scarperia e San Piero, Italy. c “Galileo Ferraris” Energy Department, Politecnico Di Torino, Corso Duca Degli Abruzzi 24, 10129, Turin, Italy  Hydrothermal processes of biomass can lead to renewable fuels. For example, the hydrothermal liquefaction (HTL) of lignocellulosic biomass produces a biocrude with higher heating value and stability then the one obtained by pyrolysis, thanks to the lower oxygen content. However, the management of the aqueous by-product is an important bottleneck in the development of such technologies. It has been estimated that the cost of aqueous by-products disposal is second only to feedstock’s cost. For this reason, the water fraction should be valorized. In this work, the aqueous phase reforming (APR) has been investigated with a double goal. First, it can convert the carbon-laden aqueous phase into a hydrogen-rich gas mixture, providing the hydrogen necessary for the upgrade of the bio-crude [1]; second, it can clean the aqueous phase that can be recycled to the liquefaction step, reducing the need for water make-up. Aqueous phase reforming has been tipically studied with model compounds, like poly-alcohols [2]. In the present work, a real aqueous-phase derived from lignin-rich HTL was used as a feedstock. The tests were performed in a continuous fixed-bed reactor, using a developmental 5% Pt/C catalyst by a commercial supplier. The influence of several reaction conditions was investigated, such as temperature, weight-hourly space velocity, co-feeding of an inert weeping gas. Beside the use of a real aqueous phase, a synthetic representative mixture was employed to highlight differences in the reactive behavior. Among the obtained results, in Figure 1, a comparison between the synthetic and real mixtures is reported. It is highlighted that the synthetic mixture showed a stable conversion of the reactants (glycolic and lactic acid, glycerol, methanol), while acetic acid was indeed produced by side-reactions. On the other hand, the real mixture reported deactivation phenomena after 250 min. The study of the textural properties of the catalyst reported that the surface area decreased, suggesting a deactivation by fouling/coking mechanism.   Figure 1. APR of synthetic (left) and real (right) mixtures. Reaction conditions: 0.8 mL/min feed flowrate, 1 g Pt/C, 270 °C. References [1] G. Pipitone, G. Zoppi, S. Bocchini, A. M. Rizzo, D. Chiaramonti, R. Pirone and S. Bensaid, Catal. Today, 2020, 345, 237–250. [2] R. D. Cortright, R. R. Davda and J. A. Dumesic, Nature, 2002, 418, 964–967. Acknowledgments The project leading to this research has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement N◦ 764675. 

Green hydrogen production from wastewater derived from lignin-rich  hydrothermal liquefaction

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Green hydrogen production from wastewater derived from lignin-rich hydrothermal liquefaction

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