Journal
APPLIED CATALYSIS A-GENERAL
Volume 621, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2021.118174
Keywords
Methane dry reforming; Ni/Al2O3; Indium; Ceria; Coke formation
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Funding
- Hungarian Academy of Sciences, Hungary
- National Research Council, Italy (HASCNR, Horvath/La Parola)
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The promotion effect of 0.3 wt% indium on different catalysts was studied and compared to the effects of ceria additive. NiIn/Al2O3 maintained activity in DRM, while NiIn/CeO2-Al2O3 reduced coke formation but also decreased catalytic activity.
Herein, the promotion effect of only 0.3 wt% indium on 3% Ni/Al2O3 and 3% Ni/CeO2-Al2O3 catalysts prepared by deposition-precipitation over a commercial alumina and on the CeO2-modified support was studied. Catalyst characterization by XRD, TPR, XPS, TEM, CO-DRIFTS was performed. The catalytic properties were investigated and coke formation was analyzed under temperature ramped CH4 -decomposition and in Dry Reforming of Methane (DRM). The unique impact of indium was compared to the well-known effects of ceria additive. The carbon deposition on Ni/Al2O3 blocking the reactor could be only delayed due to ceria on Ni/CeO2-Al2O3, while NiIn/Al2O3 was able to maintain the activity in DRM. Indium modifier acting in parallel with ceria over NiIn/CeO2-Al2O3 determined the least coking, but the least catalytic activity. The results were discussed in terms of double role of In, acting as a ceria modifier, upgrading its oxidative properties and as a metal modifier, getting alloyed with Ni.
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