期刊
CHEMICAL ENGINEERING JOURNAL
卷 368, 期 -, 页码 795-811出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.02.178
关键词
Glycerol; Steam reforming; Hydrogen; Sorption-enhanced reactor; Sorption-enhanced membrane reactor
资金
- Doctoral Program in Chemical and Biological Engineering from the Faculty of Engineering of University of Porto
- Portuguese Foundation for Science and Technology (FCT) [PD/BD/52625/2014]
- LEPABE-2-ECO-INNOVATION [NORTE-01-0145-FEDER-000005]
- European Regional Development Fund (ERDF) through the Northern Regional Operational Program (NORTE 2020)
- FCT I.P.
- FCT [SFRH/BPD/88444/2012]
- European Social Fund (ESF)
- Human Potential Operational Program (POPH)
- Norte Portugal Regional Operational Programme (NORTE 2020), under the Portugal 2020 Partnership Agreement, through the ERDF [NORTE-01-0145-FEDER-000006]
- Associate Laboratory LSRE-LCM - ERDF through COMPETE2020 - Programa Operacional Competitividade e Internacionalizacao (POCI) [POCI-01-0145-FEDER-006984]
- FCT
- Fundação para a Ciência e a Tecnologia [PD/BD/52625/2014] Funding Source: FCT
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.
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