BIOMASS FLY ASH AS A CATALYST IN BIOMASS GASIFICATION REACTIONS FOR H2 PRODUCTION

resumo

In this work, the potential of industrial biomass fly ash (BFA) granules as a waste-derived catalyst for gasification reactions, namely the water-gas-shift (WGS) reaction for H2 production, was evaluated. Response Surface Methodology was used to assess the effect of the temperature (T) and water steam to Carbon monoxide molar ratio (S/CO) on the H2 concentration. The experimental work was planned according to the central composite experimental design. The experimental results show that temperature plays a key role in the WGS reaction. Increasing T from 550 to 750 °C positively affected the H₂ concentration, reaching values up to 40 vol.%. However, for the range analysed (1 to 2 molH₂O∙mol-1CO), the S/CO molar ratio had no evident impact on the H2 concentration. The effect of the catalyst on the WGS reaction was characterised by a relevant increase in H2 concentration, from 1.5 vol.% (inert material) to 35 vol.% (BFA granules), demonstrating the catalytic activity of the BFA to promote the WGS reaction in the forward direction. This work showed that BFA has high potential as a catalyst in gasification processes to increase the H2 concentration in the producer gas, closing the cycle for biomass to energy, in the context of circular economy. © 2024, ETA-Florence Renewable Energies. All rights reserved.

autores

Gomes H.G.M.F.; Ribeiro J.P.; Cruz N.C.; Matos M.A.A.; Tarelho L.A.C.

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