The oxidizing role of CO2 at mild temperature on ceria-based catalysts

Electrical Properties of a CeO2-Bi2O3Mix System Elaborated at 600°C

“…Recently, in a structural analysis [1] Cerium dioxide (ceria) is well known for its applications as ceramic pigments, solid electrolyte in fuel cells, and catalyst in automotive gas converters [2][3][4][5][6][7][8][9]. Ceria presents mixed ionic and electronic conductivity [10,11].…”

Ceria as a Thermochemical Reaction Medium for Selectively Generating Syngas or Methane from H2O and CO2

“…While oxidation of high-surface-area ceria by oxidized gases (primarily CO 2 ) has been previously reported, the majority of these studies involved precious-metal catalysts. [18][19][20][21][22][23] The observation that such a reaction can proceed rapidly in the absence of any metal catalyst despite a very low specific surface area is unanticipated and indicates a strong inherent catalytic activity of ceria. Throughout the thermochemical cycling, we found that SDC is stable, with H 2 and CO production rates being essentially unchanged even after more than 50 cycles (see Supporting Information Figures S2-S3), an advantageous consequence of high activity in the absence of a high specific surface area.…”

A thermochemical study of ceria: exploiting an old material for new modes of energy conversion and CO 2 mitigation

“…Furthermore, development of thermochemical cycles that produce not only hydrogen but also fuels such as CH 4, CH 3 OH or CO (the latter as a syngas component) using CO 2 as an input may have greater immediate acceptability into our energy production and delivery infrastructure. In totality, these considerations suggest that ceria, which undergoes substantial oxygen stoichiometry changes without a change in crystal structure, has an extremely high melting temperature of approximately 2800 K, and displays high catalytic activity towards carbon-containing gases (Jin et al 1987;Trovarelli 1996;Murray et al 1999;Park et al 2000;Sharma et al 2000;Demoulin et al 2007), is an attractive material for thermochemical fuel production. Indeed, preliminary reports of the suitability of ceria for this technology have appeared in the recent literature (Abanades & Flamant 2006;Kaneko et al 2007Kaneko et al , 2008Kang et al 2007;Miller et al 2008;Kaneko & Tamaura 2009).…”