On the preparation of molybdenum carbide-supported metal catalysts

Joshua A. Schaidle; Neil M. Schweitzer; Olabode T. Ajenifujah; Levi T. Thompson

doi:10.1016/j.jcat.2012.02.012

On the preparation of molybdenum carbide-supported metal catalysts

Joshua A. Schaidle, Neil M. Schweitzer, Olabode T. Ajenifujah, Levi T. Thompson^*

^*Corresponding author for this work

Chemical and Biological Engineering

Research output: Contribution to journal › Article › peer-review

55 Scopus citations

Abstract

Carbide-supported metal catalysts have been demonstrated to be highly active for a number of reactions including water gas shift and electrochemical hydrogen evolution. Their activity appears to be a consequence of intimate interactions between the metal and support. These interactions as well as the structures and compositions depend on the conditions used during preparation. The objective of research described in this paper was to define key aspects regarding the adsorption and reaction of metal precursor complexes with unpassivated, high surface area Mo ₂C powders during wet impregnation. The rate of metal deposition and the final state of the metal were functions of the nature of the precursor (i.e., counter ion), electrostatic interactions, and red-ox reactions with the Mo ₂C surface. The deposition rate decreased in the following order: H ₂PtCl ₆ ∼ Pd(NH ₃) ₄(NO ₃) ₂ ∼ CuCl ₂ ∼ Cu(NO ₃) ₂ > Co(NO ₃) ₂ ∼ Ni(NO ₃) ₂ ≫ CoCl ₂ ∼ NiCl ₂ ∼ FeCl ₂ ∼ Fe(NO ₃) ₃. The observed adsorption and red-ox behavior suggest that supporting metals onto native carbide surfaces could result in properties that are significantly different from those for metals supported on oxidized carbide surfaces.

Original language	English (US)
Pages (from-to)	210-217
Number of pages	8
Journal	Journal of Catalysis
Volume	289
DOIs	https://doi.org/10.1016/j.jcat.2012.02.012
State	Published - May 1 2012

Keywords

Metal deposition
Molybdenum carbide
Wet impregnation

ASJC Scopus subject areas

Catalysis
Physical and Theoretical Chemistry

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10.1016/j.jcat.2012.02.012

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abstract = "Carbide-supported metal catalysts have been demonstrated to be highly active for a number of reactions including water gas shift and electrochemical hydrogen evolution. Their activity appears to be a consequence of intimate interactions between the metal and support. These interactions as well as the structures and compositions depend on the conditions used during preparation. The objective of research described in this paper was to define key aspects regarding the adsorption and reaction of metal precursor complexes with unpassivated, high surface area Mo 2C powders during wet impregnation. The rate of metal deposition and the final state of the metal were functions of the nature of the precursor (i.e., counter ion), electrostatic interactions, and red-ox reactions with the Mo 2C surface. The deposition rate decreased in the following order: H 2PtCl 6 ∼ Pd(NH 3) 4(NO 3) 2 ∼ CuCl 2 ∼ Cu(NO 3) 2 > Co(NO 3) 2 ∼ Ni(NO 3) 2 ≫ CoCl 2 ∼ NiCl 2 ∼ FeCl 2 ∼ Fe(NO 3) 3. The observed adsorption and red-ox behavior suggest that supporting metals onto native carbide surfaces could result in properties that are significantly different from those for metals supported on oxidized carbide surfaces.",

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AU - Schaidle, Joshua A.

AU - Schweitzer, Neil M.

AU - Ajenifujah, Olabode T.

AU - Thompson, Levi T.

PY - 2012/5/1

Y1 - 2012/5/1

N2 - Carbide-supported metal catalysts have been demonstrated to be highly active for a number of reactions including water gas shift and electrochemical hydrogen evolution. Their activity appears to be a consequence of intimate interactions between the metal and support. These interactions as well as the structures and compositions depend on the conditions used during preparation. The objective of research described in this paper was to define key aspects regarding the adsorption and reaction of metal precursor complexes with unpassivated, high surface area Mo 2C powders during wet impregnation. The rate of metal deposition and the final state of the metal were functions of the nature of the precursor (i.e., counter ion), electrostatic interactions, and red-ox reactions with the Mo 2C surface. The deposition rate decreased in the following order: H 2PtCl 6 ∼ Pd(NH 3) 4(NO 3) 2 ∼ CuCl 2 ∼ Cu(NO 3) 2 > Co(NO 3) 2 ∼ Ni(NO 3) 2 ≫ CoCl 2 ∼ NiCl 2 ∼ FeCl 2 ∼ Fe(NO 3) 3. The observed adsorption and red-ox behavior suggest that supporting metals onto native carbide surfaces could result in properties that are significantly different from those for metals supported on oxidized carbide surfaces.

AB - Carbide-supported metal catalysts have been demonstrated to be highly active for a number of reactions including water gas shift and electrochemical hydrogen evolution. Their activity appears to be a consequence of intimate interactions between the metal and support. These interactions as well as the structures and compositions depend on the conditions used during preparation. The objective of research described in this paper was to define key aspects regarding the adsorption and reaction of metal precursor complexes with unpassivated, high surface area Mo 2C powders during wet impregnation. The rate of metal deposition and the final state of the metal were functions of the nature of the precursor (i.e., counter ion), electrostatic interactions, and red-ox reactions with the Mo 2C surface. The deposition rate decreased in the following order: H 2PtCl 6 ∼ Pd(NH 3) 4(NO 3) 2 ∼ CuCl 2 ∼ Cu(NO 3) 2 > Co(NO 3) 2 ∼ Ni(NO 3) 2 ≫ CoCl 2 ∼ NiCl 2 ∼ FeCl 2 ∼ Fe(NO 3) 3. The observed adsorption and red-ox behavior suggest that supporting metals onto native carbide surfaces could result in properties that are significantly different from those for metals supported on oxidized carbide surfaces.

KW - Metal deposition

KW - Molybdenum carbide

KW - Wet impregnation

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ER -

On the preparation of molybdenum carbide-supported metal catalysts

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Keywords

ASJC Scopus subject areas

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