Lin G Gao

US Patent:

59194286, Jul 6, 1999

Filed:

Dec 5, 1996

Appl. No.:

8/759234

Inventors:

Lin Gao - Piscataway NJ
Bernard Kear - Whitehouse Station NJ
Purnesh Seegopaul - Flemington NJ

Assignee:

Nanodyne Incorporated - New Brunswick NJ

International Classification:

C01B 3134

US Classification:

423440

Abstract:

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.

US Patent:

62076094, Mar 27, 2001

Filed:

Sep 30, 1999

Appl. No.:

9/412175

Inventors:

Lin Gao - Piscataway NJ
Purnesh Seegopaul - Flemington NJ

Assignee:

N.V. Union Miniere S.A. - Brussels

International Classification:

B01J27/22

US Classification:

502177

Abstract:

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. degree. C. to maximum temperature 850. degree. 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. degree. C. The metastable molybdenum carbide is particularly suitable for use as a catalyst for the methane dry reforming reaction.