Catalyst – solid sorbent – or support therefor: product or process – Regenerating or rehabilitating catalyst or sorbent – Treating with a liquid or treating in a liquid phase,...
Patent
1992-12-28
1994-05-03
Konopka, Paul E.
Catalyst, solid sorbent, or support therefor: product or process
Regenerating or rehabilitating catalyst or sorbent
Treating with a liquid or treating in a liquid phase,...
60 39182, 60 3952, 4232391, 502 25, 502 26, 502325, 502353, 502516, 502521, B01J 3862, B01J 2322, C01B 2100
Patent
active
053088107
ABSTRACT:
A method of treating spent selective catalytic reduction (SCR) catalyst is provided, which method comprises contacting the spent catalyst with a solution comprising a SCR catalyst metal salt, preferably a vanadium salt, and heating the catalyst contacted with the metal salt solution at a calcination temperature in the presence of oxygen. Preferably, after treatment with the metal salt solution, the catalyst is dried with air for at least about 10 seconds and heated to a temperature in the range of about 130.degree. F. to about 170.degree. F. for a period of about 30 minutes to about 90 minutes before heating to the calcination temperature. In addition, a method is provided for restoring the catalytic activity of a SCR catalyst, contaminated with platinum, to enhance catalytic reduction of oxides of nitrogen to nitrogen by the SCR catalyst, said method comprising (a) contacting the spent catalyst with a metal salt containing solution; (b) then heating the catalyst in the presence of oxygen to a calcination temperature at which the metal salt is decomposed to form an oxide of the metal and the metal oxide is bonded to the catalyst support, to form a calcined catalyst; and, (c.) contacting the calcined catalyst with a SCR flue gas stream at a temperature in the range of about 450.degree. F. to about 750.degree. F. Calcination temperatures as low as 250.degree. F. are effective to restore SCR catalyst activity.
REFERENCES:
patent: 4572110 (1986-02-01), Haefich
patent: 4615991 (1986-10-01), Obayashi et al.
Kraus, H. J., and R. P. Kejariwal, "Integrating a Cogeneration Plant into a Refinery", Energy Process (vol. 8, No. 3), Sep. 1988.
Radin, M. G. and B. Boyles, "Turbine Exhaust Gas DeNOx Using Selective Catalytic Reduction", Presented to American Power Conference, Apr. 27-29, 1987.
Davis, J. S. and G. C. Duponteil, "Using SCR for NOx Control Affects HRSG Design", Operation, Power, Oct. 1986.
Murray William
Stager Ruthjean
Voss Andrew P.
Atlantic Richfield Company
Konopka Paul E.
Pruitt Tom F.
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