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Effect of Microwave Drying, Calcination and Aging of Pt/Al2O3 on Platinum Dispersion

Department of Chemical Engineering, NTNU—Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
Competence Center for Catalysis, Chemical Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
LMCPA—Laboratoire des Matériaux Céramiques et Procédés Associés, Université de Valenciennes et du Hainaut Cambrésis, Boulevard Charles de Gaulle, 59600 Maubeuge, France
Author to whom correspondence should be addressed.
Catalysts 2018, 8(9), 348;
Received: 11 August 2018 / Revised: 22 August 2018 / Accepted: 24 August 2018 / Published: 26 August 2018
(This article belongs to the Special Issue Catalysis by Precious Metals, Past and Future)
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The effect of heating method employed for drying and calcination during the synthesis of 1 wt% Pt/Al2O3 catalyst was investigated. Conventional heating (CH) in resistive oven and microwave heating (MW) in single mode were applied, and the Pt dispersion and Brunauer-Emmett-Teller (BET) surface area were measured to characterize the samples. It was evidenced that the fast and homogeneous heating offered by the microwave heating led to higher Pt dispersion. However, this benefit was only achieved when the subsequent calcination was performed in a conventional oven. The aging in microwave oven of conventionally prepared—as well as MW-prepared—catalysts demonstrated the great ability of microwave irradiation to accelerate platinum sintering. After 1 h at 800 °C under microwave, catalysts showed a dispersion of 5%. Therefore, microwave treatment should be considered for accelerated catalyst aging but should be avoided as a calcination technique for the synthesis of highly dispersed Pt/Al2O3. View Full-Text
Keywords: microwave; catalyst synthesis; Pt/Al2O3; aging; platinum dispersion; drying; DOC microwave; catalyst synthesis; Pt/Al2O3; aging; platinum dispersion; drying; DOC

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Auvray, X.; Thuault, A. Effect of Microwave Drying, Calcination and Aging of Pt/Al2O3 on Platinum Dispersion. Catalysts 2018, 8, 348.

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