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,...
Reexamination Certificate
2008-03-26
2011-11-01
Johnson, Edward (Department: 1736)
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,...
C502S054000
Reexamination Certificate
active
08048818
ABSTRACT:
An in-situ method for regenerating a deactivated catalyst removes a calcium sulfate layer masking active catalyst sites. A reducing agent converts the calcium sulfate to calcium oxide, which is then removed, by reintrainment into the flue gas steam using soot blowers or sonic horns. The method is particularly useful for regenerating selective catalytic reduction (SCR) catalysts used to remove nitrogen oxides from flue gas produced by combustion of coal from the Powder River Basin. The method can be practiced using existing SCR system hardware, and without removing the SCR system from service.
REFERENCES:
patent: 2970893 (1961-02-01), Prentiss
patent: 4507397 (1985-03-01), Buss
Ghorishi S. Behrooz
McDonald Lawrence E.
Tonn Donald P.
Vecci Stanley J.
Babcock & Wilcox Power Generation Group, Inc.
Grant Kathryn W.
Johnson Edward
Marich Eric
Seymour Michael J.
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