From sorption-enhanced reactor to sorption-enhanced membrane reactor: A step towards H-2 production optimization through glycerol steam reforming

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Joel M. Silva (Autor) FEUP; Lucília S.Ribeiro (Autor) FEUP; José J. M. Orfão (Autor) FEUP; Silvano Tosti (Autor) Outra; M. A. Soria (Autor) FEUP; Luís M. Madeira (Autor) FEUP

Revista

Título: Chemical Engineering Journal

Vol. 368

Páginas: 795-811

ISSN: 1385-8947

Editora: Elsevier

Indexação

ISI Web of Knowledge - 19 Citações

Scopus - 22 Citações

Projetos Associados

AIProcMat@N2020 - Advanced Industrial Processes and Materials for a Sustainable North Region of Portugal2020

LEPABE-2-ECO-INNOVATION - LEPABE-2-ECO-INNOVATION

Outras Informações

ID Authenticus: P-00Q-BJJ

DOI: 10.1016/j.cej.2019.02.178

Abstract (EN): The main goal of this work is to access the benefits of using a sorption-enhanced membrane reactor (SEMR) comparatively to a sorption-enhanced reactor (SER) and a traditional reactor (TR) for H-2 production through glycerol steam reforming (GSR). A SER, where a potassium-promoted hydrotalcite-like material (K-MG30) was used to capture the CO2 produced during GSR on an alumina supported Rh catalyst, was tested. An enhancement of the H-2 production was observed not only during the pre-and breakthrough of CO2 but also during the postbreakthrough as compared to the conventional TR. While the initial enhancement was mostly due to CO2 sorption and affected more directly the water-gas shift (WGS) reaction, the observed catalytic activity of K-MG30 towards glycerol decomposition and mainly WGS reaction was responsible for the improved performance during post-breakthrough. Still, considerably higher H-2 purity was obtained in the first moments. Ultimately, a much significant improvement in terms of H-2 production was observed in the SEMR, where a Pd-Ag membrane separated selectively the hydrogen from the other gases. An increment of the maximum H-2 yield in the pre- and breakthrough regions from 1.6 up to 3.6 mol center dot mol(fed glycerol)(-1) was obtained. The simultaneous removal of both H-2 and CO2 significantly benefited the WGS reaction. Consequently, only H-2 was obtained in the gas phase of the retentate stream during the pre-breakthrough period. Moreover, ultra-pure H-2 was obtained in the permeate side of the dense Pd-Ag membrane, meaning that if the SEMR is continuously operated in the pre-breakthrough region, pure H-2 would continuously be obtained in both retentate and permeate streams.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 17