Effect of Microwave Drying, Calcination and Aging of Pt/Al2O3 on Platinum Dispersion
1
Department of Chemical Engineering, NTNU—Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
2
Competence Center for Catalysis, Chemical Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
3
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; https://doi.org/10.3390/catal8090348
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)
Abstract
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-TextKeywords:
microwave; catalyst synthesis; Pt/Al2O3; aging; platinum dispersion; drying; DOC
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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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