Isotopic study of ceria-catalyzed soot oxidation in the presence of NOx

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Title: Isotopic study of ceria-catalyzed soot oxidation in the presence of NOx
Authors: Guillén Hurtado, Noelia | Garcia-Garcia, Avelina | Bueno López, Agustín
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Ceria catalyst | Diesel soot | Isotopic oxygen | Pulse experiments | NOx
Knowledge Area: Química Inorgánica
Issue Date: Mar-2013
Publisher: Elsevier
Citation: Journal of Catalysis. 2013, 299: 181-187. doi:10.1016/j.jcat.2012.11.026
Abstract: The ceria-catalyzed soot oxidation mechanism has been studied by a pulse technique with labeled O2 in the absence and presence of NO, using ceria–soot mixtures prepared in the loose contact mode. In the absence of soot, the ceria-catalyzed oxidation of NO to NO2 takes place with ceria oxygen and not with gas-phase O2. However, the oxygen exchange process between gas-phase O2 and ceria oxygen (to yield back O2, but with oxygen atoms coming from ceria) prevailed with regard to the ceria-catalyzed oxidation of NO to NO2. Gas-phase O2 did not react directly with soot when pulsed to a soot–ceria loose contact mixture. Instead, ceria oxygen is transferred to soot (this step does not require gas-phase molecular oxygen to be present), and gas-phase O2 fills up the vacancies created on the oxide in a further step. The transfer of oxygen between ceria and soot occurred directly in the absence of NO. However, in the presence of NO, NO2 is expected to be additionally generated by ceria oxygen oxidation, which also reacts with soot. The main reaction products of the ceria-catalyzed soot oxidation reaction with NO/O2 were CO2 and NO. Additionally, evidence of the reduction of NOx to N2 was found.
Sponsor: The financial support of Generalitat Valenciana (Prometeo/2009/047 project), Spanish Ministry of Science and Innovation (Project CTQ2009-07475), and UE-FEDER funding is acknowledged. N.G.H. wishes to thank Generalitat Valenciana for her Ph.D. grant within the VAL i+d Program.
ISSN: 0021-9517 (Print) | 1090-2694 (Online)
DOI: 10.1016/j.jcat.2012.11.026
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
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Appears in Collections:INV - MCMA - Artículos de Revistas

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