Patent ID: 7083766

Claim:
A process for the reduction of oxides of nitrogen contained in a gas stream wherein said process comprises contacting the gas stream with a molecular sieve produced by the method comprising: (1) preparing an as-synthesized molecular sieve having a composition, as synthesized and in the anhydrous state, in terms of mole ratios as follows: YO 2 /WO d 15–∞ M 2/n /YO 2 0–0.03 Q/YO 2 0.02–0.05 wherein Y is silicon, germanium or a mixture thereof; W is zinc, titanium or mixtures thereof; d is 1 or 2 (i.e., d is 1 when W is divalent or 2 when W is tetravalent); M is an alkali metal cation, alkaline earth metal cation or mixtures thereof; n is the valence of M (i.e., 1 or 2); and Q is a N-benzyl-1,4-diazabicyclo[2.2.2]octane cation, the as-synthesized molecular sieve having the X-ray diffraction lines of Table I; (2) thermally treating the as-synthesized molecular sieve at a temperature and for a time sufficient to remove the N-benzyl-1,4-diazabicyclo[2.2.2]octane cation from the molecular sieve; and (3) optionally, replacing at least part of the zinc and/or titanium with a metal selected from the group consisting of aluminum, gallium, iron, boron, indium, vanadium and mixtures thereof.