Mesoporous ferromagnetic MPt@Silica/Carbon (M = Fe, Co, Ni) composites As advanced bifunctional catalysts

Emanuel Kockrick; Franz Schmidt; Kristina Gedrich; Marcus Rose; Thomas A. George; Thomas Freudenberg; Ralph Kraehnert; Ralph Skomski; David J. Sellmyer; Stefan Kaskel

doi:10.1021/cm9016276

Mesoporous ferromagnetic MPt@Silica/Carbon (M = Fe, Co, Ni) composites As advanced bifunctional catalysts

Emanuel Kockrick, Franz Schmidt, Kristina Gedrich, Marcus Rose, Thomas A. George, Thomas Freudenberg, Ralph Kraehnert, Ralph Skomski, David J. Sellmyer, Stefan Kaskel

Physics and Astronomy

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Abstract

Ferromagnetic MPt (Fe, Co, Ni) nanocomposites were obtained by infiltration of aqueous and chloroform precursor solutions into ordered mesoporous SBA-15 and CMK-3. Channel-confined crystallization of the intermetallic phases was achieved under a reductive and inert atmosphere in a temperature range from 673 to 1073 K using conventional and ultrafast IR furnace heating. The proper choice of mesoporous matrix allows one to tailor crystallite size and to affect the phase transformation rate into ordered face-centered tetragonal (fct) MPt alloys. XRD and TEM techniques were used to monitor the structural evolution in the system. Physisorption methods reveal degradation of the mesoporous carbon matrix for MPt@CMK-3 composites while SBA-15 templated structures stay intact. SQUID investigations were carried out, demonstrating a strong dependence of magnetic properties on the intermetallic system, matrix, and treatment conditions. Especially for fct FePt@carbon, very high room-temperature coercivities up to 28.4 kOe were observed. The materials are efficient catalysts for acetylene to ethylene hydrogenation. Structuresensitive selectivity of FePt is reported for the first time, demonstrating a higher selectivity of fct FePt composites as compared to the disordered face-centered cubic (fcc) phase.

Original language	English (US)
Pages (from-to)	1624-1632
Number of pages	9
Journal	Chemistry of Materials
Volume	22
Issue number	5
DOIs	https://doi.org/10.1021/cm9016276
State	Published - Mar 9 2010

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

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Mesoporous ferromagnetic MPt@Silica/Carbon (M = Fe, Co, Ni) composites As advanced bifunctional catalysts. / Kockrick, Emanuel; Schmidt, Franz; Gedrich, Kristina; Rose, Marcus; George, Thomas A.; Freudenberg, Thomas; Kraehnert, Ralph; Skomski, Ralph; Sellmyer, David J.; Kaskel, Stefan.

In: Chemistry of Materials, Vol. 22, No. 5, 09.03.2010, p. 1624-1632.

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

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abstract = "Ferromagnetic MPt (Fe, Co, Ni) nanocomposites were obtained by infiltration of aqueous and chloroform precursor solutions into ordered mesoporous SBA-15 and CMK-3. Channel-confined crystallization of the intermetallic phases was achieved under a reductive and inert atmosphere in a temperature range from 673 to 1073 K using conventional and ultrafast IR furnace heating. The proper choice of mesoporous matrix allows one to tailor crystallite size and to affect the phase transformation rate into ordered face-centered tetragonal (fct) MPt alloys. XRD and TEM techniques were used to monitor the structural evolution in the system. Physisorption methods reveal degradation of the mesoporous carbon matrix for MPt@CMK-3 composites while SBA-15 templated structures stay intact. SQUID investigations were carried out, demonstrating a strong dependence of magnetic properties on the intermetallic system, matrix, and treatment conditions. Especially for fct FePt@carbon, very high room-temperature coercivities up to 28.4 kOe were observed. The materials are efficient catalysts for acetylene to ethylene hydrogenation. Structuresensitive selectivity of FePt is reported for the first time, demonstrating a higher selectivity of fct FePt composites as compared to the disordered face-centered cubic (fcc) phase.",

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AU - George, Thomas A.

AU - Freudenberg, Thomas

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AU - Skomski, Ralph

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AB - Ferromagnetic MPt (Fe, Co, Ni) nanocomposites were obtained by infiltration of aqueous and chloroform precursor solutions into ordered mesoporous SBA-15 and CMK-3. Channel-confined crystallization of the intermetallic phases was achieved under a reductive and inert atmosphere in a temperature range from 673 to 1073 K using conventional and ultrafast IR furnace heating. The proper choice of mesoporous matrix allows one to tailor crystallite size and to affect the phase transformation rate into ordered face-centered tetragonal (fct) MPt alloys. XRD and TEM techniques were used to monitor the structural evolution in the system. Physisorption methods reveal degradation of the mesoporous carbon matrix for MPt@CMK-3 composites while SBA-15 templated structures stay intact. SQUID investigations were carried out, demonstrating a strong dependence of magnetic properties on the intermetallic system, matrix, and treatment conditions. Especially for fct FePt@carbon, very high room-temperature coercivities up to 28.4 kOe were observed. The materials are efficient catalysts for acetylene to ethylene hydrogenation. Structuresensitive selectivity of FePt is reported for the first time, demonstrating a higher selectivity of fct FePt composites as compared to the disordered face-centered cubic (fcc) phase.

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Mesoporous ferromagnetic MPt@Silica/Carbon (M = Fe, Co, Ni) composites As advanced bifunctional catalysts

Abstract

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