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

Abstract

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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Authors (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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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS no. 364, pages 65 - 69,
ISSN: 0168-583X
Language:: English
Publication year:: 2015
Bibliographic description:: 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:: Digital Object Identifier (open in new tab) 10.1016/j.nimb.2015.06.013
Verified by:: Gdańsk University of Technology