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

Research output: Contribution to journal › Article

25 Scopus citations

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

Access to Document

10.1021/cm9016276

Fingerprint Dive into the research topics of 'Mesoporous ferromagnetic MPt@Silica/Carbon (M = Fe, Co, Ni) composites As advanced bifunctional catalysts'. Together they form a unique fingerprint.

Cite this

Kockrick, E., Schmidt, F., Gedrich, K., Rose, M., George, T. A., Freudenberg, T., Kraehnert, R., Skomski, R., Sellmyer, D. J., & Kaskel, S. (2010). Mesoporous ferromagnetic MPt@Silica/Carbon (M = Fe, Co, Ni) composites As advanced bifunctional catalysts. Chemistry of Materials, 22(5), 1624-1632. https://doi.org/10.1021/cm9016276

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

@article{2b8ba754d9764267be1fa7aefed8dcdb,

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

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.",

author = "Emanuel Kockrick and Franz Schmidt and Kristina Gedrich and Marcus Rose and George, {Thomas A.} and Thomas Freudenberg and Ralph Kraehnert and Ralph Skomski and Sellmyer, {David J.} and Stefan Kaskel",

year = "2010",

month = mar,

day = "9",

doi = "10.1021/cm9016276",

language = "English (US)",

volume = "22",

pages = "1624--1632",

journal = "Chemistry of Materials",

issn = "0897-4756",

publisher = "American Chemical Society",

number = "5",

}

TY - JOUR

T1 - Mesoporous ferromagnetic MPt@Silica/Carbon (M = Fe, Co, Ni) composites As advanced bifunctional catalysts

AU - Kockrick, Emanuel

AU - Schmidt, Franz

AU - Gedrich, Kristina

AU - Rose, Marcus

AU - George, Thomas A.

AU - Freudenberg, Thomas

AU - Kraehnert, Ralph

AU - Skomski, Ralph

AU - Sellmyer, David J.

AU - Kaskel, Stefan

PY - 2010/3/9

Y1 - 2010/3/9

N2 - 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.

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.

UR - http://www.scopus.com/inward/record.url?scp=77949351937&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77949351937&partnerID=8YFLogxK

U2 - 10.1021/cm9016276

DO - 10.1021/cm9016276

M3 - Article

AN - SCOPUS:77949351937

VL - 22

SP - 1624

EP - 1632

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

IS - 5

ER -