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Novel synthesis of combined CaO-Ca12Al14O33-Ni sorbent-catalyst material for sorption enhanced steam reforming processes

TitoloNovel synthesis of combined CaO-Ca12Al14O33-Ni sorbent-catalyst material for sorption enhanced steam reforming processes
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2019
AutoriVanga, G., Mirabile Gattia Daniele, Stendardo S., and Scaccia S.
RivistaCeramics International
Parole chiaveAlumina, aluminum oxide, Carbon dioxide, Catalyst activity, Ceramic materials, CO2 carrying capacity, Enhanced steam reforming, Functional materials, Hydrogen production, methane, Mixing, Multi-step approaches, Ni-based catalyst, Sorbent and catalyst, Sorbent catalysts, Sorbents, Sorption, Sorption/Desorption, Steam, Steam reforming, Synergistic effect, Temperature

A properly CaO-Ca12Al14O33-Ni material with combined sorbent properties and catalyst activity was developed for H2 production from hydrocarbons via sorption enhanced steam reforming (SE-SR) with simultaneous CO2 capture. The combined sorbent-catalyst material (CSCM) was successfully prepared by multi-step approach method. At first a mixed calcium-aluminium oxide (CAO) ceramic was prepared by wet mixing/sintering method and used both as spacer for CaO-based sorbent and support for nickel catalyst. Subsequently, the sorbent and catalyst were prepared by wet mixing/sintering (900 °C) and wet impregnation/calcination (500 °C) methods, respectively. Then, an intimately powdery 1:1 mixture of two functional materials were cold-pressed and air-sintered at 900 °C obtaining the desired one-body sorbent-catalyst. The CSCM characteristics were investigated in detail by XRD, SEM-EDS, TG-DTG, BET physisorption, and TPR techniques. The CO2 sorbent properties were assessed over 200th multiple sorption/desorption cycles and the stabilizing role of spacer Ca12Al14O33 ceramic against sorbent decay was confirmed, whereas the presence of foreign Ni ions did not affect the sorbent CO2 carrying capacity. A H2-rich gas (> 90%) with low concentrations of CO2 and CO was produced over ten consecutive steam methane reforming (600 °C)/regeneration (750 °C) cycles at steam/carbon=3 molar ratio using CSCM. This good performance of SE-SR of methane process was attributed to the synergistic effect of high CO2 capture capacity and catalytic activity, the latter thanks also to the facile surface NiAl2O4 spinel to Ni° reduction in the low temperature range of 400–600 °C. © 2019 Elsevier Ltd and Techna Group S.r.l.


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Citation KeyVanga2019