A new technique to determine catalysts amounts with ferromagnetic behaviour
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2017
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BRAZIL MRS MEETING, 16th
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Resumo
Metallic nanoparticles can be applied at several different areas, from magnetic
contrast to fuel production. Nickel is already applied in breaking H-C bounds to
the produce H2 for application in SOFC. The miniaturization of the catalyst into
nanoparticles can enhance thermal stability and performance. Nowadays, there
are some difficulties related to the synthesis, stabilization and characterization of
the nanometric system. A new technique to obtain highly disperse nanoparticles
consist in the exsolution of previously solubilized ions in a ceramic matrix [1].
Exsolved nanoparticles show higher stability and better catalytic performance, if
compared with only deposited particles. The quantization of nanoparticles in the
material, using XRD, SEM, TEM or EDS analyses, is not a simple task due
limitations of each technic. Magnetic measurements are quick and can provide a
precise amount of ferromagnetic particles present in the sample. To demonstrate
this technique, samples with compositions (La1-xSrx)(Cr1-yNiy)O3 (x and y = 0, 0.1
and 0.2) were synthesized by complex polymerization method. The morphology of
the obtained powder was observed with SEM and TEM. The samples were
reduced at 800 °C and 900 °C in pure hydrogen, in order to create metallic nickel
nanoparticles by exsolution. Magnetic analyses were conducted with a
SQUID/VSM. Reduced samples show a coupling between the ferromagnetic and
antiferromagnetic behaviour and a higher temperature of Neel, when compared
with thermally treated air. Using as magnetic measurements results was possible
to determine higher amounts of Ni, if compared with values obtain from Rietveld
refinement.
Como referenciar
TINTI, VICTOR B.; FONSECA, FABIO C.; FLORIO, DANIEL de. A new technique to determine catalysts amounts with ferromagnetic behaviour. In: BRAZIL MRS MEETING, 16th, September 10-14, 2017, Gramado, RS. Abstract... São Carlos, SP: Aptor Software, 2017. p. 337-338. Disponível em: http://repositorio.ipen.br/handle/123456789/31197. Acesso em: 19 Apr 2024.
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