Patent ID: 7226575

Claim:
A method for preparing a boron-containing molecular sieve having the CHA crystal structure and comprising (1) silicon oxide and (2) boron oxide or a combination of boron oxide and aluminum oxide, iron oxide, titanium oxide, gallium oxide and mixtures thereof, said method comprising: A. forming an aqueous reaction mixture comprising a composition in terms of mole ratios falling within the following ranges: YO 2 /W a O b >2–2,000 OH—/YO 2 0.2–0.45 Q/YO 2 0.2–0.45 M 2/n O/YO 2 0–0.25 H 2 O/YO 2 22–80 wherein Y is silicon, W is boron or a combination of boron and aluminum iron, titanium, gallium and mixtures thereof; a is 1 or 2 and b is 2 when a is 1 or b is 3 when a is 2; M is an alkali metal or alkaline earth metal, n is the valence of M, Q is a quaternary ammonium cation delved from 1-adamantamine, 3-quinuclidinol or 2-exo-aminonorbornane and wherein the aqueous reaction mixture does not contain fluorine; and B. maintaining said aqueous mixture under sufficient crystallization conditions until crystals are formed.