Structure-sensitivity of the water-gas shift reaction over highly active Cu/SiO2 catalysts

Kuijpers, E.G.M.; Tjepkema, R.B.; Wal, W.J.J. van der; Mesters, C.M.A.M.; Spronck, S.F.G.M.; Geus, J.W.

doi:10.1016/s0166-9834(00)81230-0

Cited by 47 publications

(19 citation statements)

References 6 publications

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“…Kinks and steps are also much more active than terrace sites for alkane dissociation reactions on Ir [46] and Pt [47] surfaces. On supported Ni catalysts, CH 4 decomposition has been shown to occur faster on smaller Ni crystallites [48]. Zhang et al [13] and Wang and Ruckenstein [17] reported that CH 4 turnover rates increased with increasing metal dispersion for CO 2 -CH 4 reforming on Rh/Al 2 O 3 .…”

Section: Dispersion and Support Effects On Turnover Rates For Ch 4 Rementioning

confidence: 99%

Structural requirements and reaction pathways in methane activation and chemical conversion catalyzed by rhodium

Jin

Iglesia

2004

Journal of Catalysis

377

128

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Section: Dispersion and Support Effects On Turnover Rates For Ch 4 Rementioning

confidence: 99%

Structural requirements and reaction pathways in methane activation and chemical conversion catalyzed by rhodium

Jin

Iglesia

2004

Journal of Catalysis

377

128

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“…Haldor and Tȏpsoe [11] patented the technical application of Cu-Zn/Cr 2 O 3 catalysts in WGS reaction. Incorporation of manganese oxide into Cu-Zn/Cr 2 O 3 systems brings about a significant improvement in its thermal stability [3,[12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Low Temperature WGS Catalysts for Hydrogen Station and Fuel Processor Applications

Moon

2009

Catal Surv Asia

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Generally, water gas shift (WGS) reaction is a very important step in the industrial production of hydrogen, ammonia and other bulk chemicals utilizing synthesis gases. In this paper, we are reporting WGS reaction carried out in our research group for the application of hydrogen station and fuel processor. We prepared various Mo 2 C, PtNi-based and Cu-based catalysts for low temperature WGS reaction. The characteristics of the prepared catalyst were analyzed by N 2 physisorption, CO chemisorptions, XRD, SEM and TEM technologies, and compared with that of commercial Cu-Zn/Al 2 O 3 catalyst. It was found that prepared catalysts displayed reasonably good activity and thermal cycling stability than commercial LTS (Cu-Zn/ Al 2 O 3 ) catalyst. It was found that the deactivation of commercial LTS catalyst during the thermal cycling run at 250°C was caused by the sintering of active metal even though it shows high activity at less than 250°C. The deactivation of Mo 2 C catalyst during the thermal cycling run was caused by the transition of Mo d? , Mo IV and Mo 2 C on the surface of Mo 2 C catalyst to Mo VI (MoO 3 ) with the reaction of H 2 O in reactants. However, they showed higher stability than the commercial LTS catalyst during thermal cycling test. The Pt-Ni/CeO 2 catalyst after the thermal cycling shows slightly deactivation due to the sintering of Ni metal. Among Cu-based catalysts, it was found that CuMo/Ce 0.5 Zr 0.5 O 2 catalyst has higher WGS activity and stability over commercial LTS catalyst. The results suggested that Pt-Ni/CeO 2 and Cu-Mo/Ce 0.5 Zr 0.5 O 2 catalysts are desirable candidates for application in hydrogen station and fuel processor system even though all other catalysts deactivated slowly during the thermal cycling run.

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“…Recent studies have shown that noble metals (e.g., Pt, Au) supported on CeO 2 are promising lowtemperature WGS catalysts [4][5][6]. Similarly to the case of Cu and magnetite-based catalysts [7][8][9][10][11], two main types of reaction mechanism have been proposed. First, a redox (i.e., regenerative) route has been suggested, in which CO adsorbs on a Pt site and is oxidised by oxygen atoms from the ceria with re-oxidation of the ceria occurring by reaction with H 2 O [4,12,13].…”

Section: Introductionmentioning

confidence: 99%

On the complexity of the water-gas shift reaction mechanism over a Pt/CeO2 catalyst: Effect of the temperature on the reactivity of formate surface species studied by operando DRIFT during isotopic transient at chemical steady-state

Meunier¹,

Tibiletti²,

Goguet

et al. 2007

Catalysis Today

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Structure-sensitivity of the water-gas shift reaction over highly active Cu/SiO2 catalysts

Cited by 47 publications

References 6 publications

Structural requirements and reaction pathways in methane activation and chemical conversion catalyzed by rhodium

Structural requirements and reaction pathways in methane activation and chemical conversion catalyzed by rhodium

Low Temperature WGS Catalysts for Hydrogen Station and Fuel Processor Applications

On the complexity of the water-gas shift reaction mechanism over a Pt/CeO2 catalyst: Effect of the temperature on the reactivity of formate surface species studied by operando DRIFT during isotopic transient at chemical steady-state

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