Process for preparing medium pore size zeolites using neutral amines
AssigneeChevron U.S.A. Inc.
InventorsYumi Nakagawa, Stacey I. Zones
Life of this patent
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Abstract
The present invention relates to a process for preparing medium pore size zeolites using small, neutral amines capable of forming the zeolite, the amine containing (a) only carbon, nitrogen and hydrogen atoms, (b) one primary, secondary or tertiary, but not quaternary, amino group, and (c) a tertiary nitrogen atom, at least one tertiary carbon atom, or a nitrogen atom bonded directly to at least one secondary carbon atom, wherein the process is conducted in the absence of a quaternary ammonium compound.
Claims19
A process for preparing a unidimensional, medium pore size zeolite which comprises:
- (a) preparing an aqueous solution from (1) sources of an alkali metal oxide, alkaline earth metal oxide or mixtures thereof;
- (2) sources of an oxide selected from the oxides of aluminum, iron, gallium, indium, titanium, or mixtures thereof;
- (3) sources of an oxide selected from oxides of silicon, germanium or mixtures thereof;
- and (4) at least one small, neutral amine capable of forming the zeolite, said amine containing four to about eight carbon atoms and (a) only carbon, nitrogen and hydrogen atoms, (b) one primary, secondary or tertiary, but not quaternary, amino group, and (c) a tertiary nitrogen atom, or at least one tertiary carbon atom, or a nitrogen atom bonded directly to at least one secondary carbon atom;
- (b) maintaining the aqueous solution under conditions sufficient to form crystals of the zeolite;
- and
- (c) recovering the crystals of the zeolite,
- wherein said process is conducted in the absence of a quaternary ammonium compound.
A unidimensional, medium pore size zeolite composition, as-synthesized and in the anhydrous state, whose general formula, in terms of mole ratios, is as follows:
- ______________________________________ YO.sub.2 /W.sub.2 O.sub.3 .gtoreq.15 Q/YO.sub.2 0.02-0.10 M.sub.2/n /YO.sub.2 0.015-0.10 ______________________________________
- wherein Y is silicon, germanium or a mixture thereof;
- W is aluminum, gallium, indium, iron, titanium, or mixtures thereof;
- Q is at least one small, neutral amine capable of forming the zeolite, said amine containing four to about eight carbon atoms and (a) only carbon, nitrogen and hydrogen atoms, (b) one primary, secondary or tertiary, but not quaternary, amino group, and (c) a tertiary nitrogen atom, or at least one tertiary carbon atom, or a nitrogen atom bonded directly to at least one secondary carbon atom;
- M is alkali metal cation, alkaline earth metal cations or mixtures thereof, n is the valence of M, wherein said composition does not contain a quaternary ammonium compound.
A process for preparing the zeolite ZSM-5 having the X-ray diffraction lines of Table II which comprises:
- (a) preparing an aqueous solution from (1) sources of an alkali metal oxide, alkaline earth metal oxide or mixtures thereof;
- (2) sources of an oxide selected from the oxides of aluminum, iron, gallium, indium, titanium, or mixtures thereof;
- (3) sources of an oxide selected from oxides of silicon, germanium or mixtures thereof;
- and (4) cyclopentylamine;
- (b) maintaining the aqueous solution under conditions sufficient to form crystals of the zeolite;
- and
- (c) recovering the crystals of the zeolite.
The zeolite ZSM-5, as-synthesized and in the anhydrous state, whose general formula, in terms of mole ratios, is as follows:
- ______________________________________ YO.sub.2 /W.sub.2 O.sub.3 .gtoreq.15 Q/YO.sub.2 0.02-0.10 M.sub.2/n /YO.sub.2 0.015-0.10 ______________________________________
- wherein Y is silicon, germanium or a mixture thereof;
- W is aluminum, gallium, indium, iron, titanium, or mixtures thereof;
- Q is cyclopentylamine;
- M is alkali metal cation, alkaline earth metal cations or mixtures thereof, and n is the valence of M.
Dependencies are inferred from the claim text.