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

TitleCatalytic performance of Ni/CaO-Ca12Al14O33catalyst in the green synthesis gas production via CO2reforming of CH4
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2021
AuthorsScaccia, S., L. Seta Della, Mirabile Gattia Daniele, and Vanga G.
JournalJournal of CO2 Utilization
KeywordsAlumina, aluminum oxide, Atmospheric pressure, Calcium aluminum oxide, calcium oxide, carbon, Carbon dioxide, Catalyst activity, Catalytic conversion, Catalytic performance, Coke, Deposits, Dry reforming-of-methane, Gas industry, Green Synthesis, Mesoporous catalysts, Molar ratio, Nickel, Nickel oxide, Pore size, Reference catalyst, Synthesis gas, Synthesis gas manufacture, Synthesis gas production, Temperature range

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 Elsevier Ltd.


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Citation KeyScaccia2021