Platinum–zinc oxide (Pt@ZnO) and palladium–zinc oxide (Pd@ZnO) core–shell nanoparticles were synthesized in solution using a method based on self-assembly and deposited onto a functionalized alumina (Si–Al2O3) support. TEM investigations of the samples confirm the formation of core–shell structures of approximately 6 nm of diameter following calcination to remove the ligands. In situ TEM and coulometric titration experiments suggest that Pt–Zn alloys are formed upon reduction and that these are highly tunable in size. While methanol steam reforming (MSR) measurements on conventional Pt/Al2O3 and Pd/Al2O3 catalysts show poor CO2 selectivities, a Pt (1 wt%)@ZnO (9 wt%)/Si–Al2O3 system showed comparable activity and selectivity for CO2 as a conventional Pt/ZnO catalyst, providing further indication that Pt@ZnO forms a Pt–Zn alloy upon reduction due to the intimate contact between the two materials. The Pd@ZnO/Si–Al2O3 exhibited lower CO2 selectivities than Pt@ZnO/Si–Al2O3.

Supported platinum–zinc oxide core–shell nanoparticle catalysts for methanol steam reforming

FORNASIERO, Paolo;
2014-01-01

Abstract

Platinum–zinc oxide (Pt@ZnO) and palladium–zinc oxide (Pd@ZnO) core–shell nanoparticles were synthesized in solution using a method based on self-assembly and deposited onto a functionalized alumina (Si–Al2O3) support. TEM investigations of the samples confirm the formation of core–shell structures of approximately 6 nm of diameter following calcination to remove the ligands. In situ TEM and coulometric titration experiments suggest that Pt–Zn alloys are formed upon reduction and that these are highly tunable in size. While methanol steam reforming (MSR) measurements on conventional Pt/Al2O3 and Pd/Al2O3 catalysts show poor CO2 selectivities, a Pt (1 wt%)@ZnO (9 wt%)/Si–Al2O3 system showed comparable activity and selectivity for CO2 as a conventional Pt/ZnO catalyst, providing further indication that Pt@ZnO forms a Pt–Zn alloy upon reduction due to the intimate contact between the two materials. The Pd@ZnO/Si–Al2O3 exhibited lower CO2 selectivities than Pt@ZnO/Si–Al2O3.
2014
http://pubs.rsc.org/en/content/articlelanding/2014/ta/c4ta04790g#!divAbstract
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2837963
 Avviso

Registrazione in corso di verifica.
La registrazione di questo prodotto non è ancora stata validata in ArTS.

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 31
  • ???jsp.display-item.citation.isi??? 29
social impact