Zeolite SSZ-28

Claim 2

A zeolite having a mole ratio of an oxide selected from silicon oxide, germanium oxide and mixtures thereof to an oxide selected from aluminum oxide, gallium oxide, iron oxide, boron oxide and mixtures thereof greater than about 20:1 to about 45:1, and having the X-ray diffraction lines of Table 1.

Claim 3

A zeolite having a composition, as synthesized and in the anhydrous state, in terms of mole ratios of oxides as follows: (0.1 to 2.0)Q 2 O:(0.1 to 2.0)M 2 O:W 2 O 3 :(20:1 to about 45:1) YO 2 wherein M is an alkali metal cation, W is selected from aluminum, gallium, iron, boron and mixtures thereof, Y is selected from silicon, germanium and mixtures thereof, Q is an N,N-dimethyltropinium or N,N-dimethyl-3-azonium bicyclo[3.2.2]nonane cation and having the X-ray diffraction lines of Table 1.

Claim 4

A zeolite having a composition, as synthesized and in the anhydrous state, in terms of mole ratios of oxides as follows: (0.1 to 2.0)Q 2 O:(0.1 to 2.0)M 2 O:W 2 O 3 :(20:1 to about 45:1) YO 2 wherein M is an alkali metal cation, W is selected from aluminum, gallium, iron, boron and mixtures thereof, Y is selected from silicon, germanium and mixtures thereof, Q is an N,N-dimethyltropinium or N,N-dimethyl-3-azonium bicyclo[3.2.2]nonane cation and having the X-ray diffraction lines of Table 1.

Claim 5

The zeolite of claim 2 wherein Q is N,N'-dimethyl-3-azonium bicyclo[3.2.2]nonane.

Claim 6

The zeolite of claim 2 wherein W is aluminum and Y is silicon.

Claim 7

A zeolite prepared by thermally treating the zeolite of claim 2 at a temperature from about 200° C. to 820° C.

Claim 8

The zeolite of claim 5 having the X-ray diffraction lines of Table 2.

Claim 9

The zeolite of claim 1, 2 or 5 wherein said mole ratio of silicon oxide or germanium oxide to aluminum oxide, gallium oxide, iron oxide or boron oxide is about 30:1 to 45:1.

Claim 10

A zeolite of claim 1, 2 or 5 which has undergone ion exchange with hydrogen, ammonium, rare earth metal, Group IIA metal, or Group VIII metal ions.

Claim 11

A zeolite of claim 1, 2 or 5 wherein rare earth metals, Group IIA metals, or Group VIII metals are occluded in the zeolite.

Claim 12

A zeolite composition, comprising the zeolite of claim 1, 2 or 5 and an inorganic matrix.

Claim 13

A process for preparing the zeolite of claim 1, comprising: (a) preparing an aqueous mixture containing sources of an alkali metal oxide, an N,N-dimethyl-tropinium cation or N,N-dimethyl-3-azonium bicyclo[3.2.2]nonane, an oxide selected from aluminum oxide, wherein said aluminum oxide source provides aluminum oxide which is in a covalently dispersed form on silica; gallium oxide; iron oxide, boron oxide and mixtures thereof, and an oxide selected from silicon oxide; germanium oxide and mixtures thereof; and wherein the aqueous mixture has a composition in terms of mole ratios of oxides falling in the ranges: YO 2 /W 2 O 3 , 20:1 to 50:1; Q/YO 2 , 0.05:1 to 0.50:1; wherein Y is selected from silicon, germanium and mixtures thereof, W is selected from aluminum, gallium, iron, boron and mixtures thereof, and Q is an N,N-dimethyl-tropinium cation or N,N-dimethyl-3-azonium bicyclo[3.2.2]nonane; (b) maintaining the mixture at a temperature of at least 140° C. until the crystals of said zeolite form; and (c) recovering said crystals.

Claim 14

The process of claim 11 wherein Q is N,N-dimethyl-3-azonium bicyclo[3.2.2]nonane.

Claim 15

The process of claim 11 or 12 wherein Y is silicon and W is aluminum.