Issue 22, 2012
From the journal:

CrystEngComm

Waste-free scale up synthesis of nanocrystalline hexaaluminate: properties in oxygen transfer and oxidation reactions

Said Laassiri,ab   Nicolas Bion,b   Fabien Can,b   Xavier Courtois,b   Daniel Duprez,b   Sébastien Royer*ab  and  Houshang Alamdari*a  

* Corresponding authors

a Department of Mining, Metallurgical and Materials Engineering, Université Laval, Québec, Canada, G1V 0A6
E-mail: houshang.alamdari@gmn.ulaval.ca
Tel: +1-418 656-7666

b Université de Poitiers, CNRS UMR 7285, IC2MP, 4 Rue Michel Brunet, 86022 Poitiers Cedex - France
E-mail: sebastien.royer@univ-poitiers.fr
Tel: +33-5-49-45-34-79

Abstract

Synthesis of nanocrystalline hexaaluminate is reported using an original activated reactive synthesis process. Starting from a classical ceramic solid, exhibiting low surface area and a micrometric crystal size, a two-step grinding process allows reduction of the crystal size down to a few nanometers and development of high surface areas. The synthetic process was then used to produce transition metal- and noble metal-doped structures. The effects of (i) morphological and structural properties and (ii) substitution on oxygen transfer properties and catalytic properties in CO and CH4 oxidation reactions were studied. Crystal size was shown to be a key parameter in controlling the bulk oxygen transfer. Study of the catalytic properties in low and high temperature oxidation reactions also shows the crucial effect of the morphological parameters. Highest activities were achieved over nanocrystalline high surface compositions. Finally, even if less active than classical palladium supported solids, these new structures exhibited extremely high thermal stability.

Graphical abstract: Waste-free scale up synthesis of nanocrystalline hexaaluminate: properties in oxygen transfer and oxidation reactions

  • This article is part of the themed collection: Nanocrystals
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Article information

DOI
https://doi.org/10.1039/C2CE25737H
Article type
Paper
Submitted
11 May 2012
Accepted
03 Jul 2012
First published
04 Jul 2012

CrystEngComm, 2012,14, 7733-7743

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Waste-free scale up synthesis of nanocrystalline hexaaluminate: properties in oxygen transfer and oxidation reactions

S. Laassiri, N. Bion, F. Can, X. Courtois, D. Duprez, S. Royer and H. Alamdari, CrystEngComm, 2012, 14, 7733 DOI: 10.1039/C2CE25737H

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