Process for deactivating catalytically active sites on the exter

Details Process for deactivating catalytically active sites on the exter Process for deactivating catalytically active sites on the exter

1983-02-17

1984-09-18

Gantz, Delbert E.

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

502232, 502263, B01J 2906, B01J 2102

Patent

active

044725167

ABSTRACT:
Disclosed is a method for selectively deactivating catalytically active sites which occur only on the surface of a zeolite of boralite catalyst. Active sites occurring on the interior of the pores are masked by saturating the catalyst with an organic compound which fills substantially the whole of the catalyst pore volume. The catalyst so treated is then exposed to a deactivating agent, such as a solution of an alkali metal salt which is substantially immiscible with, substantially insoluble in, and which is otherwise unreactive to said pore-filling compound. The catalyst is then treated to drive off the pore-filling compound, yielding a catalyst selectively deactivated only on the external surface, but which is not deactivated within the pores. The treatment enables the catalyst to be used for e.g. hydrocarbon conversion for long time periods without carbon buildups around the pore entrances, which buildup would otherwise either restrict entry into the pores by reactants or exit therefrom by product.

REFERENCES:
patent: 3702886 (1972-11-01), Argauer et al.
patent: 3806466 (1974-04-01), Bird et al.
patent: 4002697 (1977-01-01), Chen
patent: 4100215 (1978-07-01), Chen
patent: 4231899 (1980-11-01), Chen et al.
patent: 4254297 (1981-03-01), Frenken et al.

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