Issue 29, 2012

Catalytic dissolution of ceria under mild conditions

Abstract

The dissolution of ceria is studied through a catalytic reduction process involving platinum nanoparticles in mild conditions at near ambient temperature. The deposition of platinum nanoparticles is made by sonication (Ar, 18 W cm−2, 20 kHz), and further dissolution is studied as a function of different parameters such as stirring, sonication, dissolution media and temperature. The dissolution is evaluated using UV-vis spectrophotometry, ICP-AES, and SEM. The quantitative dissolution of ceria can be performed in HNO3–HCOOH–[N2H5][NO3], HNO3–[N2H5][NO3] or H2SO4–HCOOH mixtures at 40 °C. Nevertheless, it is shown that the combined use of ultrasound with nitric media in the presence of platinum nanoparticles can lead to passivating phenomena resulting in a decrease of the dissolution rate.

Graphical abstract: Catalytic dissolution of ceria under mild conditions

Article information

Article type
Paper
Submitted
30 Mar 2012
Accepted
25 May 2012
First published
28 May 2012

J. Mater. Chem., 2012,22, 14734-14740

Catalytic dissolution of ceria under mild conditions

M. Virot, T. Chave, D. Horlait, N. Clavier, N. Dacheux, J. Ravaux and S. I. Nikitenko, J. Mater. Chem., 2012, 22, 14734 DOI: 10.1039/C2JM31996A

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