Microwave heating in high pressure reaction vessels

Alain Largeteau (1) , S. Oree (2) , C. Marzat (2) , Gérard Demazeau (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 MASTER - Laboratoire Modélisation avancée des systèmes thermiques et écoulements réels

We report the use of microwave -hydrothermal processing to synthesize various ceramic powders. Microwave-hydrothermal processing is compared with conventional hydrothermal processing in the crystallisation of MoO2. The presence of microwave field leads to accelerated kinetics of crystallization of the finely divided molybdenum dioxide particles. Existing microwave heated pressure vessels for chemical synthesis cannot be used above 250 MPa and 270°C because they contain parts made of polymeric materials. The objective of this work is to associate a microwave source to a high pressure vessel in a way such that it might be used to carry out reactions in aqueous media at pressures around 100 MPa and temperatures above the critical point of water.

Mots clés: Solvothermal; Microwaves; Synthesis; Powders; Pressure vessel; Internal heating; Pressure vesse!; Interna! heating

Domaines: Matériaux; Génie chimique

Alain Largeteau, S. Oree, C. Marzat, Gérard Demazeau. Microwave heating in high pressure reaction vessels. High Pressure Research, 2001, 20 (1-6), pp.281-288. ⟨10.1080/08957950108206175⟩. ⟨hal-03670755⟩