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Title

Combined sorbent and catalyst material for sorption enhanced reforming of methane under cyclic regeneration in presence of H2O and CO2

AuthorsDi Felice, Luca; Kazi, Saima; Sørby, Magnus H.; Martínez Berges, Isabel; Grasa Adiego, Gemma ; Maury, Delphine; Meyer, Julien
KeywordsH2 production
Sorption Enhanced Reforming
CaO-based CO2 sorbent
Ni-based reforming catalyst
Composite material
Process intensification
Issue Date8-Nov-2018
PublisherElsevier
CitationFuel Processing Technology 183: 35-47 (2018)
AbstractAn investigation on an innovative calcium‑nickel Combined Sorbent and Catalyst Material (CSCM) for Sorption Enhanced Reforming (SER) of methane is presented in this paper. After hydrothermal synthesis, a nominal 30 wt% CaO-based sorbent supported on mayenite was physically mixed with a commercial reforming catalyst and granulated to obtain bifunctional particles of 200–300 μm. Materials were characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller surface analysis (BET) and Mercury- intrusion prosimetry (Hg-porosimetry). A novel thermo-gravimetric analysis (TGA) approach was employed for investigating SER activity, particularly the materials performance during multicycling methane reforming and sorbent carbonation followed by regeneration in oxidative atmosphere – either in the presence of steam or CO2 at high temperature. When regeneration is carried out in 100 vol% CO2 at 925 °C, an intermediate reduction step between cycles was crucial to maintain the catalytic activity of the CSCM for 100 consecutive sorption-regeneration cycles. In spite of a stable catalytic activity, the initial sorption capacity of the CSCM sorbent function (~16gCO2/100gCSCM) declined progressively with cyclic runs and stabilized at ~10gCO2/100gCSCM from cycle 90 onwards. This decline in capacity has been related to CaO depletion by solid phase reaction with the catalyst support.
Description10 Figuras.- 2 Tablas.- 7 Extras
Publisher version (URL)http://dx.doi.org/10.1016/j.fuproc.2018.10.012
URIhttp://hdl.handle.net/10261/192644
DOI10.1016/j.fuproc.2018.10.012
ISSN0378-3820
Appears in Collections:(ICB) Artículos
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