An investigation of possible mechanisms of the water-gas shift reaction over a ZrO2-supported Pt catalyst


Autoria(s): Tibiletti, Daniele; Meunier, Frederic; Goguet, Alexandre; Reid, D.; Burch, Robbie; Boaro, M.; Vicario, M.; Trovarelli, A.
Data(s)

10/12/2006

Resumo

The present work investigates the reactivity of the surface species observable by in situ DRIFTS formed over a Pt/ZrO2 during the water-gas shift (WGS) reaction. A DRIFTS cell/mass spectrometer system was operated at the chemical steady state during isotopic transients to yield information about the true nature (i.e., main reaction intermediate or spectators) of adsorbates. Only carbonyl and formate species were observed by DRIFTS under reaction conditions; the surface coverage of carbonate species was negligible. Isotopic transient kinetic analyses revealed that formates exchanged uniformly according to a first-order law, suggesting that most formates observed by DRIFTS were of the same reactivity. In addition, the time scale of the exchange of the reaction product CO2 was significantly shorter than that of the surface formates. Therefore, a formate route based on the formates as detected by DRIFTS can be ruled out as the main reaction pathway in the present case. The number of precursors of the reaction product CO2 was smaller than the number of surface Pt atoms, suggesting that carbonyl species or some \

Identificador

http://pure.qub.ac.uk/portal/en/publications/an-investigation-of-possible-mechanisms-of-the-watergas-shift-reaction-over-a-zro2supported-pt-catalyst(53f5cade-ef8e-42e5-a205-b02b87b54a04).html

http://dx.doi.org/10.1016/j.jcat.2006.09.004

http://www.scopus.com/inward/record.url?scp=33750514636&partnerID=8YFLogxK

Idioma(s)

eng

Direitos

info:eu-repo/semantics/restrictedAccess

Fonte

Tibiletti , D , Meunier , F , Goguet , A , Reid , D , Burch , R , Boaro , M , Vicario , M & Trovarelli , A 2006 , ' An investigation of possible mechanisms of the water-gas shift reaction over a ZrO2-supported Pt catalyst ' Journal of Catalysis , vol 244 , no. 2 , pp. 183-191 . DOI: 10.1016/j.jcat.2006.09.004

Palavras-Chave #/dk/atira/pure/subjectarea/asjc/1500/1503 #Catalysis #/dk/atira/pure/subjectarea/asjc/1500/1508 #Process Chemistry and Technology
Tipo

article