Dry Reforming of Methane over 15wt.% Ni/CaO-Ca12Al14O33 catalyst was performed in a microreactor in the temperature range 600-800°C under atmospheric pressure, at WHSV of 120 Lg-1h-1 and by time on stream of 12 h for producing synthesis gas. The novel catalyst was prepared by Ni wet impregnation of a mixed calcium-aluminum-oxide (CAO) ceramic support. Similarly, a Ni/γ-Al2O3 reference catalyst was prepared. Characterizations were conducted by TGA-FTIR, XRD, SEM-EDS, N2 physisorption, H2-TPR, CO2-TPD, and CO2-TPRn techniques. After calcination(500°C)/reduction(700°C) steps in situ formed CaO promoter was highly dispersed on Ca12Al14O33 carrier, which induced strong basicity. A good anchorage of NiO on CAO support was evidenced by reduction peaks at 490°C and 650°C on the H2-TPR profile. The reduced mesoporous catalyst presented high SBET, large pores volume, and unimodal pore size distribution. High reactants conversions, good H2 and CO selectivity, and H2/CO molar ratio close to unity at 800°C were achieved. Although the catalytic activity of Ni/γ-Al2O3 reference catalyst was slightly better than that of Ni/CaO-Ca12Al14O33 catalyst the stability was worse owing to the excessive carbon build-ups, whereas the novel catalyst displayed a very low carbon deposit on spent catalyst at 600 and 700°C, and negligible coke deposit at 800°C. It was established that the basicity of CaO-Ca12Al14O33 support can play a key role in preventing coke deposition during DRM. The Ni CaO-Ca12Al14O33 can serve as sorbent for CO2 capture and simultaneously for its catalytic conversion in a valuable fuel.

Catalytic performance of Ni/CaO-Ca12Al14O33catalyst in the green synthesis gas production via CO2reforming of CH4

Scaccia S.;Della Seta L.;Mirabile Gattia D.;
2021-01-01

Abstract

Dry Reforming of Methane over 15wt.% Ni/CaO-Ca12Al14O33 catalyst was performed in a microreactor in the temperature range 600-800°C under atmospheric pressure, at WHSV of 120 Lg-1h-1 and by time on stream of 12 h for producing synthesis gas. The novel catalyst was prepared by Ni wet impregnation of a mixed calcium-aluminum-oxide (CAO) ceramic support. Similarly, a Ni/γ-Al2O3 reference catalyst was prepared. Characterizations were conducted by TGA-FTIR, XRD, SEM-EDS, N2 physisorption, H2-TPR, CO2-TPD, and CO2-TPRn techniques. After calcination(500°C)/reduction(700°C) steps in situ formed CaO promoter was highly dispersed on Ca12Al14O33 carrier, which induced strong basicity. A good anchorage of NiO on CAO support was evidenced by reduction peaks at 490°C and 650°C on the H2-TPR profile. The reduced mesoporous catalyst presented high SBET, large pores volume, and unimodal pore size distribution. High reactants conversions, good H2 and CO selectivity, and H2/CO molar ratio close to unity at 800°C were achieved. Although the catalytic activity of Ni/γ-Al2O3 reference catalyst was slightly better than that of Ni/CaO-Ca12Al14O33 catalyst the stability was worse owing to the excessive carbon build-ups, whereas the novel catalyst displayed a very low carbon deposit on spent catalyst at 600 and 700°C, and negligible coke deposit at 800°C. It was established that the basicity of CaO-Ca12Al14O33 support can play a key role in preventing coke deposition during DRM. The Ni CaO-Ca12Al14O33 can serve as sorbent for CO2 capture and simultaneously for its catalytic conversion in a valuable fuel.
2021
Basic promoter
CaO-Ca
12
Al
14
O
33
support
Carbon deposition
Dry reforming of methane
Nickel-based catalyst
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12079/65433
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