N.v. Union Miniere S.a.

Nanodyne Incorporated

N.v. Union Miniere S.a. Et Al.

Lin Gao

Purnesh Seegopaul

Bernard H Kear

A molybdenum carbide compound is formed by reacting a molybdate with a mixture of hydrogen and carbon monoxide. By heating the molybdate powder from a temperature below 300&#xb0; C. to maximum temperature 850&#xb0; C., a controlled reaction can be conducted wherein molybdenum carbide is formed. A high surface area, nanograin, metastable molybdenum carbide can be formed when the reaction temperature is below 750&#xb0; C. The metastable molybdenum carbide is particularly suitable for use as a catalyst for the methane dry reforming reaction and the water gas shift reaction.

Method of using molybdenum carbide catalyst

Tungsten carbide is formed from a tungsten material which is preferably tungsten carbide scrap. If scrap material is used, this is oxidized and acid leached to remove impurities and any binder material. This is then dissolved in a solution of sodium hydroxide and spray dried to form a precursor compound. A carbon compound such as citric acid can be added to the solution prior to spray drying to provide a carbon source for the tungsten carbide. The powder formed from the spray dried solution is calcined and carburized to form tungsten carbide.

Method of forming nanograin tungsten carbide and recycling tungsten carbide

A molybdenum carbide compound is formed by reacting a molybdate with a mixture of hydrogen and carbon monoxide. By heating the molybdate powder from a temperature below 300&deg; C. to maximum temperature 850&deg; C., a controlled reaction can be conducted wherein molybdenum carbide is formed. A high surface area, nanograin, metastable molybdenum carbide can be formed when the reaction temperature is below 750&deg; C. The metastable molybdenum carbide is particularly suitable for use as a catalyst for the methane dry reforming reaction.

Method of forming molybdenum carbide catalyst

Nanograined tungsten carbide particles are formed by a controlled, simultaneous reduction carburization reaction wherein the kinetics of the carburization and reduction reactions are controlled to permit simultaneous reduction and carburization. The kinetics are controlled by reacting a reduction carburization gas mixture, preferably hydrogen and carbon monoxide by slowly increasing the reaction temperature by controlling the rate of temperature increase. Preferably, the reaction temperature will be increased less than 25.degree. C. per minute, preferably about 1-2 degrees per minute, which prevents the formation of stable, undesirable species such as W.sub.2 C, which in turn interferes with the reaction efficiency.

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Lin Gao