The catalytic oxidation of glycerol produces high added value chemical products. Gold-based catalysts showed activity and selectivity depending on particle size and specific preparation method. Moreover, the support plays a fundamental role in modulating the stability of the catalytic system. However, the literature is still lacking of a precise disclosure of these important relationships. Herein, we synthesized two series of gold catalysts on different carbon supports (Vulcan-XC72R, X40S and Norit GSX), the first synthesized by solvated metal atom deposition (SMAD) and the second by Sol Immobilization technique (SOL). First of all, the specific physico-chemical properties of the supports and the synthesis procedure influenced the dispersion and the size of Au NPs making a direct comparison among the different carbon difficult. In particular, on Vulcan-XC72R, AuNPs showed narrow size and good dispersion, whereas on Norit GSX and X40S-Camel a notably wider size distribution has been revealed. XPS analyses showed Au exposure changed accordingly to the presence of oxygen species, lower O content corresponding to lower Au exposure. Unexpectedly however this does not correspond to a lower activity, being the lowest Au/C (%at), the Vulcan ones, the most active catalysts. Comparing SOL and SMAD prepared samples on the same carbon, the SOL ones always result more active.

Carbon-Supported Au Nanoparticles: Catalytic Activity Ruled Out by Carbon Support / A. Jouve, M. Stucchi, I. Barlocco, C. Evangelisti, F. Somodic, A. Villa, L. Prati. - In: TOPICS IN CATALYSIS. - ISSN 1022-5528. - 61:18-19 (Special Issue)(2018 Nov), pp. 1928-1938.

Carbon-Supported Au Nanoparticles: Catalytic Activity Ruled Out by Carbon Support

A. Jouve
Primo
;
M. Stucchi
Secondo
;
I. Barlocco;A. Villa
Penultimo
;
L. Prati
Ultimo
2018-11

Abstract

The catalytic oxidation of glycerol produces high added value chemical products. Gold-based catalysts showed activity and selectivity depending on particle size and specific preparation method. Moreover, the support plays a fundamental role in modulating the stability of the catalytic system. However, the literature is still lacking of a precise disclosure of these important relationships. Herein, we synthesized two series of gold catalysts on different carbon supports (Vulcan-XC72R, X40S and Norit GSX), the first synthesized by solvated metal atom deposition (SMAD) and the second by Sol Immobilization technique (SOL). First of all, the specific physico-chemical properties of the supports and the synthesis procedure influenced the dispersion and the size of Au NPs making a direct comparison among the different carbon difficult. In particular, on Vulcan-XC72R, AuNPs showed narrow size and good dispersion, whereas on Norit GSX and X40S-Camel a notably wider size distribution has been revealed. XPS analyses showed Au exposure changed accordingly to the presence of oxygen species, lower O content corresponding to lower Au exposure. Unexpectedly however this does not correspond to a lower activity, being the lowest Au/C (%at), the Vulcan ones, the most active catalysts. Comparing SOL and SMAD prepared samples on the same carbon, the SOL ones always result more active.
Carbon-supported Au; Gold nanoparticles; Glycerol oxidation; Selectivity; SMAD; Sol immobilization; Selective oxidation
Settore CHIM/03 - Chimica Generale e Inorganica
Settore CHIM/04 - Chimica Industriale
4-giu-2018
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/587134
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