Influence of cation nature on stabilization of gold nanospecies in mordenites

I. Tuzovskaya; E. Lima; P. Bosch; N. Bogdanchikova; A. Pestryakov; J. Fraissard

doi:10.1166/jnn.2011.3432

Influence of cation nature on stabilization of gold nanospecies in mordenites

I. Tuzovskaya, E. Lima, P. Bosch, N. Bogdanchikova^*, A. Pestryakov, J. Fraissard

^*Corresponding author for this work

Nanobiophysics

Research output: Contribution to journal › Article › Academic › peer-review

5 Citations (Scopus)

Abstract

Gold species deposited on NH⁺₄ - and H⁺-mordenites were studied by X-ray diffraction, xenon adsorption, NMR of ²⁷Al and ¹²⁹Xe, UV-Visible spectroscopy and TPR. Mordenite ion-exchange cations exert a significant effect on size distribution and electronic state of gold species supported on the zeolites. AuNH ₄M contains larger nanoparticles of gold on its external surface than AuHM because protonic form of zeolite has stronger sites for stabilization of gold nanospecies. In the case of NH⁺₄ -mordenite, Au clusters inside zeolite channels have bigger size and fill the side-pockets completely after gold deposition due to more complete reduction of gold entities, while in H⁺-mordenite only half the side-pockets are filled by gold species. H⁺-mordenite favors the stabilization of both small gold clusters and cations. Even after the reduction of gold by hydrogen flow at 100 °C, some gold species are not completely reduced and have certain effective charge (Au^δ+_n clusters).

Original language	English
Pages (from-to)	5469-5475
Number of pages	7
Journal	Journal of nanoscience and nanotechnology
Volume	11
Issue number	6
DOIs	https://doi.org/10.1166/jnn.2011.3432
Publication status	Published - 1 Dec 2011

Keywords

Catalysts
Clusters
Gold
Nanoparticles
Zeolites

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title = "Influence of cation nature on stabilization of gold nanospecies in mordenites",

abstract = "Gold species deposited on NH+4 - and H+-mordenites were studied by X-ray diffraction, xenon adsorption, NMR of 27Al and 129Xe, UV-Visible spectroscopy and TPR. Mordenite ion-exchange cations exert a significant effect on size distribution and electronic state of gold species supported on the zeolites. AuNH 4M contains larger nanoparticles of gold on its external surface than AuHM because protonic form of zeolite has stronger sites for stabilization of gold nanospecies. In the case of NH+4 -mordenite, Au clusters inside zeolite channels have bigger size and fill the side-pockets completely after gold deposition due to more complete reduction of gold entities, while in H+-mordenite only half the side-pockets are filled by gold species. H+-mordenite favors the stabilization of both small gold clusters and cations. Even after the reduction of gold by hydrogen flow at 100 °C, some gold species are not completely reduced and have certain effective charge (Auδ+n clusters).",

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author = "I. Tuzovskaya and E. Lima and P. Bosch and N. Bogdanchikova and A. Pestryakov and J. Fraissard",

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AU - Lima, E.

AU - Bosch, P.

AU - Bogdanchikova, N.

AU - Pestryakov, A.

AU - Fraissard, J.

PY - 2011/12/1

Y1 - 2011/12/1

N2 - Gold species deposited on NH+4 - and H+-mordenites were studied by X-ray diffraction, xenon adsorption, NMR of 27Al and 129Xe, UV-Visible spectroscopy and TPR. Mordenite ion-exchange cations exert a significant effect on size distribution and electronic state of gold species supported on the zeolites. AuNH 4M contains larger nanoparticles of gold on its external surface than AuHM because protonic form of zeolite has stronger sites for stabilization of gold nanospecies. In the case of NH+4 -mordenite, Au clusters inside zeolite channels have bigger size and fill the side-pockets completely after gold deposition due to more complete reduction of gold entities, while in H+-mordenite only half the side-pockets are filled by gold species. H+-mordenite favors the stabilization of both small gold clusters and cations. Even after the reduction of gold by hydrogen flow at 100 °C, some gold species are not completely reduced and have certain effective charge (Auδ+n clusters).

AB - Gold species deposited on NH+4 - and H+-mordenites were studied by X-ray diffraction, xenon adsorption, NMR of 27Al and 129Xe, UV-Visible spectroscopy and TPR. Mordenite ion-exchange cations exert a significant effect on size distribution and electronic state of gold species supported on the zeolites. AuNH 4M contains larger nanoparticles of gold on its external surface than AuHM because protonic form of zeolite has stronger sites for stabilization of gold nanospecies. In the case of NH+4 -mordenite, Au clusters inside zeolite channels have bigger size and fill the side-pockets completely after gold deposition due to more complete reduction of gold entities, while in H+-mordenite only half the side-pockets are filled by gold species. H+-mordenite favors the stabilization of both small gold clusters and cations. Even after the reduction of gold by hydrogen flow at 100 °C, some gold species are not completely reduced and have certain effective charge (Auδ+n clusters).

KW - Catalysts

KW - Clusters

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Influence of cation nature on stabilization of gold nanospecies in mordenites

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Keywords

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