Support effects and catalytic trends for water gas shift activity of transition metals

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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Support effects and catalytic trends for water gas shift activity of transition metals. / Boisen, Astrid; Janssens, T.V.W.; Schumacher, Nana Maria Pii; Chorkendorff, Ib; Dahl, Søren.

In: Journal of Molecular Catalysis A: Chemical, Vol. 315, No. 2, 2010, p. 163-170.

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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Boisen, Astrid; Janssens, T.V.W.; Schumacher, Nana Maria Pii; Chorkendorff, Ib; Dahl, Søren / Support effects and catalytic trends for water gas shift activity of transition metals.

In: Journal of Molecular Catalysis A: Chemical, Vol. 315, No. 2, 2010, p. 163-170.

Publication: Research - peer-reviewJournal article – Annual report year: 2010

Bibtex

@article{5fe8594f6d6049f2bd7ffefcc9cc279b,
title = "Support effects and catalytic trends for water gas shift activity of transition metals",
publisher = "Elsevier BV",
author = "Astrid Boisen and T.V.W. Janssens and Schumacher, {Nana Maria Pii} and Ib Chorkendorff and Søren Dahl",
year = "2010",
doi = "10.1016/j.molcata.2009.06.019",
volume = "315",
number = "2",
pages = "163--170",
journal = "Journal of Molecular Catalysis A: Chemical",
issn = "1381-1169",

}

RIS

TY - JOUR

T1 - Support effects and catalytic trends for water gas shift activity of transition metals

A1 - Boisen,Astrid

A1 - Janssens,T.V.W.

A1 - Schumacher,Nana Maria Pii

A1 - Chorkendorff,Ib

A1 - Dahl,Søren

AU - Boisen,Astrid

AU - Janssens,T.V.W.

AU - Schumacher,Nana Maria Pii

AU - Chorkendorff,Ib

AU - Dahl,Søren

PB - Elsevier BV

PY - 2010

Y1 - 2010

N2 - Water gas shift activity measurements for 12 transition metals (Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Re, Ir, Pt, Au) supported on inert MgAl2O4 and Ce0.75Zr0.25O2 are presented, to elucidate the influence of the active metal and the support. The activity is related to the adsorption energy of molecular CO and atomic oxygen on the metal; the latter is a good measure for the reactivity of the metal towards H2O. Generally, the activity of the catalysts with the Ce0.75Zr0.25O2 support is higher, compared to the corresponding MgAl2O4-supported catalysts. Exceptions are Cu and Au, which have a higher activity on the MgAl2O4 support and are both characterized by weak CO adsorption. For the MgAl2O4-supported catalysts a volcano-type relation between the activity and the adsorption energy of atomic oxygen on the metal is obtained. The maximum activity is found for metals with a binding energy of oxygen around −2.5 eV. No clear correlation exists with the adsorption energy of CO. In contrast, the activity for the Ce0.75Zr0.25O2 support increases with increasing adsorption strength for CO, and based on a relatively low activity of Cu the activity does not seem to depend on the adsorption energy of oxygen. Such a change in activity-descriptor for the different supports can be rationalized by the possibility that water dissociation occurs on the redox-active Ce0.75Zr0.25O2 support, whereas the MgAl2O4 support is inactive.

AB - Water gas shift activity measurements for 12 transition metals (Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Re, Ir, Pt, Au) supported on inert MgAl2O4 and Ce0.75Zr0.25O2 are presented, to elucidate the influence of the active metal and the support. The activity is related to the adsorption energy of molecular CO and atomic oxygen on the metal; the latter is a good measure for the reactivity of the metal towards H2O. Generally, the activity of the catalysts with the Ce0.75Zr0.25O2 support is higher, compared to the corresponding MgAl2O4-supported catalysts. Exceptions are Cu and Au, which have a higher activity on the MgAl2O4 support and are both characterized by weak CO adsorption. For the MgAl2O4-supported catalysts a volcano-type relation between the activity and the adsorption energy of atomic oxygen on the metal is obtained. The maximum activity is found for metals with a binding energy of oxygen around −2.5 eV. No clear correlation exists with the adsorption energy of CO. In contrast, the activity for the Ce0.75Zr0.25O2 support increases with increasing adsorption strength for CO, and based on a relatively low activity of Cu the activity does not seem to depend on the adsorption energy of oxygen. Such a change in activity-descriptor for the different supports can be rationalized by the possibility that water dissociation occurs on the redox-active Ce0.75Zr0.25O2 support, whereas the MgAl2O4 support is inactive.

U2 - 10.1016/j.molcata.2009.06.019

DO - 10.1016/j.molcata.2009.06.019

JO - Journal of Molecular Catalysis A: Chemical

JF - Journal of Molecular Catalysis A: Chemical

SN - 1381-1169

IS - 2

VL - 315

SP - 163

EP - 170

ER -