Catalyst for selective production of para dialkyl substituted be

Details Catalyst for selective production of para dialkyl substituted be Catalyst for selective production of para dialkyl substituted be

1976-09-23

1978-05-23

Dees, Carl F.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

55 75, B01J 2906

Patent

active

040909816

ABSTRACT:
A catalyst particularly applicable for the selective production of para dialkyl substituted benzenes is provided comprising a porous crystalline aluminosilicate zeolite which has undergone modification by deposition thereon of a coating of silica extensively covering, and residing substantially exclusively on the external surface thereof as a result of contact with a silicone compound of a molecular size incapable of entering the pores of the zeolite and subsequent heating in an oxygen-containing atmosphere to a temperature in excess of 300.degree. C. but below a temperature at which crystallinity of the zeolite is adversely affected at a rate such that the silicone compound does not volatilize prior to undergoing oxidation to silica. The zeolite is characterized by an activity, in terms of alpha value, of between about 2 and about 5000, a xylene sorption capacity greater than 1 gram/100 grams of zeolite and an ortho-xylene sorption time for 30 percent of said capacity of greater than 10 minutes, said sorption capacity and sorption time being measured at 120.degree. C. and a xylene pressure of 4.5 .+-. 0.8 mm. of mercury.

REFERENCES:
patent: 2722504 (1955-11-01), Fleck
patent: 3751504 (1973-08-01), Keown et al.
patent: 3980586 (1976-09-01), Mitchell

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