Catalysts for ammonia synthesis

Details Catalysts for ammonia synthesis Catalysts for ammonia synthesis

2006-10-03

2006-10-03

Langel, Wayne A. (Department: 1754)

Chemistry of inorganic compounds

Nitrogen or compound thereof

Ammonia or ammonium hydroxide

C502S185000

Reexamination Certificate

active

07115239

ABSTRACT:
Catalysts for ammonia synthesis based on ruthenium, directly supported over graphite having BET specific surface area in excess of 10 m2/g, preferably in excess of 100 m2/g and more preferably in excess of 280 m2/g, the graphite being characterised by X-ray diffraction pattern containing the diffraction lines characteristic of the crystalline graphite only, with exclusion of relevant bands due to amorphous carbon, to which catalysts barium, caesium and potassium are added as promoters. The graphitic supports allow to avoid the known pre-treatments and post-treatments needed in the case of supports obtained by partial graphitisation of active carbons and during use they are affected negligibly by the methanation shown by the supports obtained from active carbons. Furthermore, the catalysts of the present invention are characterised by a very high activity, even with ruthenium loadings well below the known loading.

REFERENCES:
patent: 4055628 (1977-10-01), Tennison et al.
patent: 4163775 (1979-08-01), Foster et al.
patent: 4271136 (1981-06-01), Tennison
patent: 4568530 (1986-02-01), Mandelik et al.
patent: 4568532 (1986-02-01), Le Blanc et al.
patent: 4600571 (1986-07-01), McCarroll et al.
patent: 4698325 (1987-10-01), Andrew et al.
patent: 5061671 (1991-10-01), Kitson et al.
patent: 0 120 655 (1984-10-01), None
patent: 0 662 343 (1995-07-01), None
patent: 0 931 586 (1999-07-01), None
patent: 1 028 101 (2000-08-01), None
Forni L et al:, “Carbon-supported promoted Ru catalyst for ammonia synthesis” Applied Catalysis A: General, Elsevier Science, Amsterdam, NL, vol. 185, No. 2, Sep. 20, 1999, pp. 269-275, XP004272107, ISSN: 0926-860X.

Affiliated with

Also associated with

Rating

Catalysts for ammonia synthesis does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Catalysts for ammonia synthesis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Catalysts for ammonia synthesis will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3649332