Le vaporeformage du méthane : étude de la désactivation du catalyseur et de la cinétique intrinsèque d'un catalyseur PGM

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Supervisors: De Wilde, Juray
Faculty: Ecole polytechnique de Louvain
Degree label: Master [120] : ingénieur civil en chimie et science des matériaux
Abstract: enThis paper deals with steam methane reforming which is a production process of a hydrogen-rich synthesis gas. The process uses an external heat source to convert water vapour and methane to hydrogen and carbon oxides. However, conversion of the process may be reduced by deactivation of the catalyst. The first part focuses on the three majority mechanisms leading to this deactivation. The coke formation process, poisoning and sintering of the catalyst are theoretically detailed. These three mechanisms are studied in particular for the nickel-based catalyst. This metal is the most used due to its low price in industrial applications. The deactivation is then compared with more resistant and more active catalysts based on noble metals. The remainder of the paper focuses on the intrinsic kinetic of steam methane reforming for a platinum group metal-based catalyst. The various criteria used in the reactor design are first analysed. The kinetic model is also detailed and provides the corresponding rate equations. The estimation of kinetic parameters is then approached from data collected through the methane reforming and methanation campaigns. Finally, an extrapolation to industrial temperatures is presented.