A properly CaO-Ca 12 Al 14 O 33 -Ni material with combined sorbent properties and catalyst activity was developed for H 2 production from hydrocarbons via sorption enhanced steam reforming (SE-SR) with simultaneous CO 2 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 CO 2 sorbent properties were assessed over 200th multiple sorption/desorption cycles and the stabilizing role of spacer Ca 12 Al 14 O 33 ceramic against sorbent decay was confirmed, whereas the presence of foreign Ni ions did not affect the sorbent CO 2 carrying capacity. A H 2 -rich gas (> 90%) with low concentrations of CO 2 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 CO 2 capture capacity and catalytic activity, the latter thanks also to the facile surface NiAl 2 O 4 spinel to Ni° reduction in the low temperature range of 400–600 °C.

Novel synthesis of combined CaO-Ca 12 Al 14 O 33 -Ni sorbent-catalyst material for sorption enhanced steam reforming processes

Stendardo S.;Scaccia S.
2019

Abstract

A properly CaO-Ca 12 Al 14 O 33 -Ni material with combined sorbent properties and catalyst activity was developed for H 2 production from hydrocarbons via sorption enhanced steam reforming (SE-SR) with simultaneous CO 2 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 CO 2 sorbent properties were assessed over 200th multiple sorption/desorption cycles and the stabilizing role of spacer Ca 12 Al 14 O 33 ceramic against sorbent decay was confirmed, whereas the presence of foreign Ni ions did not affect the sorbent CO 2 carrying capacity. A H 2 -rich gas (> 90%) with low concentrations of CO 2 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 CO 2 capture capacity and catalytic activity, the latter thanks also to the facile surface NiAl 2 O 4 spinel to Ni° reduction in the low temperature range of 400–600 °C.
CaO-Ca ; 12; Al ; 14; O ; 33; sorbent ; Combined sorbent catalyst material; Ni-based catalyst; Sorption enhanced steam reforming of methane
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/52555
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