Catalyst – solid sorbent – or support therefor: product or process – Regenerating or rehabilitating catalyst or sorbent – Gas or vapor treating
Patent
1987-08-12
1989-03-14
Konopka, Paul E.
Catalyst, solid sorbent, or support therefor: product or process
Regenerating or rehabilitating catalyst or sorbent
Gas or vapor treating
208113, 208120, 208164, 423235, 502 21, 502 41, B01J 3836, R01J 2938, C10G 1118, C01B 2120
Patent
active
048124311
ABSTRACT:
Coke is removed from particulate catalyst by passing the coke-containing catalyst into a regenerator containing a fluidized dense bed of catalyst. An oxygen containing gas is added to the regenerator to burn coke from catalyst. The dense bed has a reducing atmosphere in its lower half because most of the CO promoter catalyst present in the regenerator is in the upper half of the dense bed. Nitrogen oxides formed during coke combustion are at least partially reacted to form free nitrogen in the CO-rich atmosphere within the lower-half of the regenerator dense bed. A CO combustion promotor, e.g., platinum on alumina, having a low density, or small size is preferred as it concentrates near the upper portion of the regenerator dense bed. The process is especially useful in FCC regenerators for minimizing the NO.sub.x content of the flue gas, however, it is applicable to any fluidized bed combustion process.
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Konopka Paul E.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
Stone Richard D.
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