Bonded zeolites and process for preparing them
AssigneeEniricerche S.p.A.
InventorsGiuseppe Bellussi, Franco Buonomo, Antonio Esposito, Mario G. Clerici, Ugo Romano
Life of this patent
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Abstract
Zeolites having a pore diameter comprised within the range of from 5 to 12 .ANG. are bonded with amorphous oligomeric silica, by dispersing them in an aqueous solution of silica and alkylammonium hydroxide, and submitting the obtained suspension to a quick drying.
Claims22
A process for producing a zeolite bonded with oligomeric silica, said process comprising:
- (i) mixing a zeolite-in-water suspension with an aqueous solution of oligomeric silica and alkyl-ammonium hydroxide, the percentage of zeolite in the zeolite-in-water suspension being from 20% to 50% by weight, the molar ratio in the aqueous solution between the oligomeric silica and alkyl-ammonium hydroxide being from 0.05 to 0.2, the molar ratio between the oligomeric silica and water in the silica and alkyl-ammonium hydroxide solution being from 0.025 to 0.0125, the weight ratio between the oligomeric silica and zeolite in the mixture of solution and suspension being from 5:95 to 20:80, the zeolite having a pore diameter of from 5 .ANG. to 13 .ANG., the zeolite being selected from the group consisting of:
- (a) a zeolite consisting of Si, Al and B;
- (b) a zeolite consisting of Si, Al and Ti;
- (c) a zeolite consisting of Si, Ti and Fe;
- (d) a zeolite consisting of Si and B;
- (e) Zeolite ZSM-5;
- (f) Zeolite ZSM-11;
- and
- (g) Zeolite T;
- and
- (ii) drying the mixture obtained in step (i).
A zeolite bonded with oligomeric silica, in the form of microspheres, having a weight ratio of oligomeric silica to zeolite within the range of 5:95 to 20:80, wherein the zeolite is selected from the group consisting of:
- (a) a zeolite consisting of Si, Al and B;
- (b) a zeolite consisting of Si, Al and Ti;
- (c) a zeolite consisting of Si, Ti and Fe;
- (d) a zeolite consisting of Si and B;
- (e) Zeolite ZSM-5;
- (f) Zeolite ZSM-11;
- and
- (g) Zeolite T.
Dependencies are inferred from the claim text.