Catalyst – solid sorbent – or support therefor: product or process – Regenerating or rehabilitating catalyst or sorbent – By heat
Patent
1994-03-29
1995-11-14
Pal, Asok
Catalyst, solid sorbent, or support therefor: product or process
Regenerating or rehabilitating catalyst or sorbent
By heat
502 20, B01J 3802, B01J 3800
Patent
active
054666457
ABSTRACT:
A method is provided for the restoration of catalytic activity in deactivated nitrogen-treated carbon catalysts. Nitrogen-treated carbon catalysts are those carbonaceous chars which have been subjected to nitrogen-containing compounds at temperatures above about 700.degree. C. These nitrogen-containing compounds can be present either as part of the char raw material or as an additive to the char at any point during its manufacture. The method provides for a means to restore catalytic activity which is largely independent of the mechanism by which deactivation of the catalyst sites occurs. In the present invention, the deactivated nitrogen-treated carbonaceous char is heated to temperatures greater than 700.degree. C., followed by cooling in an inert atmosphere. While at temperatures above 700.degree. C., the char can be exposed to gasifying agents such as steam, carbon dioxide, or oxygen.
REFERENCES:
patent: 1528905 (1925-03-01), Woodruff
patent: 3700563 (1973-10-01), Karweil et al.
patent: 4219537 (1980-08-01), Steiner
patent: 4256606 (1991-03-01), Noack et al.
Calgon Carbon Corporation
Neill Patrick J.
Pal Asok
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