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

Research output: Contribution to journalArticle

24 Citations (Scopus)

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 languageEnglish (US)
Pages (from-to)1624-1632
Number of pages9
JournalChemistry of Materials
Volume22
Issue number5
DOIs
StatePublished - Mar 9 2010

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Silicon Dioxide
Intermetallics
Infrared furnaces
Carbon
Silica
Acetylene
Catalysts
Physisorption
Catalyst selectivity
SQUIDs
Composite materials
Crystallite size
Chloroform
Chlorine compounds
Crystallization
Coercive force
Infiltration
Hydrogenation
Magnetic properties
Nanocomposites

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

Kockrick, E., Schmidt, F., Gedrich, K., Rose, M., George, T. A., Freudenberg, T., ... 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 journalArticle

Kockrick, E, Schmidt, F, Gedrich, K, Rose, M, George, TA, Freudenberg, T, Kraehnert, R, Skomski, R, Sellmyer, DJ & Kaskel, S 2010, 'Mesoporous ferromagnetic MPt@Silica/Carbon (M = Fe, Co, Ni) composites As advanced bifunctional catalysts', Chemistry of Materials, vol. 22, no. 5, pp. 1624-1632. https://doi.org/10.1021/cm9016276
Kockrick, Emanuel ; Schmidt, Franz ; Gedrich, Kristina ; Rose, Marcus ; George, Thomas A. ; Freudenberg, Thomas ; Kraehnert, Ralph ; Skomski, Ralph ; Sellmyer, David J. ; Kaskel, Stefan. / Mesoporous ferromagnetic MPt@Silica/Carbon (M = Fe, Co, Ni) composites As advanced bifunctional catalysts. In: Chemistry of Materials. 2010 ; Vol. 22, No. 5. pp. 1624-1632.
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