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Hydrogen production from biomass by continuous fast pyrolysis and in-line steam reforming
A. Arregi,G. Lopez,M. Amutio,I. Barbarias,J. Bilbao,M. Olazar
RSC Advances Pub Date : 03/02/2016 00:00:00 , DOI:10.1039/C6RA01657J
Abstract

The continuous fast pyrolysis (500 °C) of pine wood sawdust has been studied in a conical spouted bed reactor (CSBR) followed by in-line steam reforming of the pyrolysis vapours in a fluidised bed reactor on a Ni commercial catalyst. An analysis has been carried out on the effect reforming temperature in the 550–700 °C range, space time from 2.5 to 30 gcat min gvolatiles−1 and steam/biomass ratio between 2 and 5 have on the pyrolysis volatile conversion, H2 yield and gaseous stream composition. The continuous pyrolysis-reforming process has shown great potential for H2 production from biomass, with no operational problems and allowing for full conversion of pyrolysis vapours. Thus, a maximum H2 yield of 117 g per kg of biomass was obtained at 600 °C, at the highest space time studied (30 gcat min gvolatiles−1) and for a S/B ratio of 4. This yield is higher than those obtained by other alternatives, such as direct steam gasification or bio-oil reforming. Moreover, the char produced in the pyrolysis step has been continuously removed from the conical spouted bed reactor in order to be upgraded following promising valorisation alternatives.

Graphical abstract: Hydrogen production from biomass by continuous fast pyrolysis and in-line steam reforming
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