Tungsten carbide catalysts, their preparation and...

B - Operations – Transporting – 01 – J

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B01J 27/22 (2006.01) B01J 37/02 (2006.01) C07C 31/20 (2006.01)

Patent

CA 2720693

A tungsten carbide catalyst comprises WC as its main active component, one or more transition metals with a small amount selected form the group consisting of Ni, Co, Fe, Ru, Rh, Pd, Os, Ir, Pt and Cu as the second metal component, the main and second component are both carried on the support or composite support selected from the group consisting of active carbon, Al2O3, SiO2, SiC, TiO2, ZrO2 or its mixture. The catalyst can be used in catalytically converting cellulose to ethylene glycol under the hydrothermal conditions comprising the temperature of 120-300°C and the hydrogen pressure of 1-10 MPa with high selectivi-ty and yield. As compared with the process using ethylene as raw materials, the process using renewable resources as raw materi-als is friendly to the environment and economical.

L'invention concerne un catalyseur à base de carbure de tungstène, qui comprend WC en tant que composant actif principal, un ou plusieurs métaux de transition en une petite quantité choisis dans le groupe constitué de Ni, Co, Fe, Ru, Rh, Pd, Os, Ir, Pt et Cu en tant que second composant métallique. Le composant principal et le composant secondaire sont tous les deux portés par le support ou support composite choisi dans le groupe constitué du carbone actif, Al2O3, SiO2, SiC, TiO2, ZrO2 ou leurs mélanges. Le catalyseur peut être utilisé pour la conversion catalytique de cellulose en éthylène glycol en conditions hydrothermales comprenant la température de 120 à 300 °C et la pression d'hydrogène de 1 à 10 MPa avec une grande sélectivité et un grand rendement. En comparaison du procédé utilisant l'éthylène en tant que matière première, le procédé utilisant des ressources renouvelables en tant que matières premières est respectueux de l'environnement et économique.

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