Nano-structured Pt embedded in acidic salts of heteropolymolybdate matrices: MS EXAFS study

Agnieszka Witkowska; Sonia Dsoke; Roberto Marassi; Andrea DiCicco

doi:10.1016/j.nimb.2015.06.013

Nano-structured Pt embedded in acidic salts of heteropolymolybdate matrices: MS EXAFS study

Abstrakt

A structural study of Pt nano-catalysts is presented in the paper. The innovation in the case of the considered catalytic materials resides in the use a meso-microporous inorganic matrix of heteropolyacid salt of composition X2.5H0.5YMo12O40 where X = Rb, Cs and Y = P, Si as a catalyst support. Metallic nanoparticles were created by platinum ions reduction in a hot H2/Argon stream and were mainly located into matrix pores. As the porous structure can be controlled by the type and content of the cation used, the desired/optimal Pt nanoparticle size can be precisely defined by using a proper heteropolyacid salt composition. Multiple-scattering extended X-ray absorption fine structure (MS EXAFS) analysis was applied to obtain the relation between the matrix composition and the size of the catalyst nanoparticles. The results showed that it was only the secondary structure form of the heteropolymolybdate salt (i.e. Rb or Cs cations) that influenced the metallic nanoparticle size. The smaller the X atom ionic radii, the larger the mean diameter of the embedded Pt nanoparticles.

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Autorzy (4)

Agnieszka Witkowska dr hab. inż.
Sonia Dsoke
- School of Science and Technology, University of Camerino, Camerino (MC), Italy Chemistry Division
Roberto Marassi
- School of Science and Technology, University of Camerino, Camerino (MC), Italy Chemistry Division
Andrea DiCicco prof.
- School of Science and Technology, University of Camerino, Camerino (MC), Italy Physics Division

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Kategoria:: Publikacja w czasopiśmie
Typ:: artykuł w czasopiśmie wyróżnionym w JCR
Opublikowano w:: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS nr 364, strony 65 - 69,
ISSN: 0168-583X
Język:: angielski
Rok wydania:: 2015
Opis bibliograficzny:: Witkowska A., Dsoke S., Marassi R., Dicicco A.: Nano-structured Pt embedded in acidic salts of heteropolymolybdate matrices: MS EXAFS study// NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS. -Vol. 364, (2015), s.65-69
DOI:: Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.nimb.2015.06.013
Weryfikacja:: Politechnika Gdańska