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Au-CeO2-based nanocatalysts supported on SBA-15 for preferential oxidation of carbon monoxide (PrOx-CO)

Abstract

In this work, as-synthesized SBA-15 was used as a support for CeO2 and Au nanoparticles (NPs), in order to stabilize them and to promote the metal/oxide interface contact. CeO2 NPs were grown within the pores of SBA-15 using the method of successive metalorganic impregnation-decomposition cycles (IDC), and samples with increasing number of IDCs (x = 2, 5 and 8) were obtained. This method allowed control of the SiO2/CeO2 ratio and tailoring of samples with different crystallite sizes (2-4 nm). The (x)CeO2/S15 supports were then decorated with Au NPs through the Deposition-Precipitation (DP) method using NaOH. The DP conditions used along with the pore size limitations from each support allowed control over the Au NPs size (4 - 9 nm). The samples were characterized by N2 physisorption, XRD, TEM, ICP-OES, XRF, DRS, Raman Spectroscopy and for its catalytic activity for PrOx-CO. The pure supported Au-catalyst exhibited maximum CO conversion at 300 °C. The incorporation of CeO2 reduced the reaction temperature to as low as 100 ºC, while the peak performance for CO conversion was observed for the catalyst containing Au and 5 IDCs of CeO2 (2.0 mol of CO2 formation per mol of Au per second at 135 °C). Further increasing the amount of CeO2 (8 IDC) resulted, however, in a decrease of the catalytic activity, resulting in a substantial reduction of the surface area and subsequent reduced access of the reaction gases (H2, CO, O2) to the active sites of the catalyst.

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Supplementary files

Article information


Submitted
11 Aug 2020
Accepted
01 Oct 2020
First published
02 Oct 2020

New J. Chem., 2020, Accepted Manuscript
Article type
Paper

Au-CeO2-based nanocatalysts supported on SBA-15 for preferential oxidation of carbon monoxide (PrOx-CO)

G. Pinha de Sousa, C. S. Oliveira, É. Teixeira Neto, F. A. Sigoli and I. O. Mazali, New J. Chem., 2020, Accepted Manuscript , DOI: 10.1039/D0NJ04050A

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