Patent ID: 7026267

Claim:
A catalyst composition comprising: a molecular sieve having a framework including at least [AlO 4 ] and [PO 4 ] tetrahedral units, a binder and a matrix material, and at least one phosphorus compound separate from said molecular sieve; wherein said composition is formed from a substantially homogeneous catalyst precursor mixture comprising said molecular sieve, said binder, said matrix material and said phosphorus compound and to which said phosphorus compound and binder are added prior to addition of said matrix material during formulation of said catalyst precursor mixture, wherein said catalyst precursor mixture has a particle size distribution of at least 90 percent of solid particles having a diameter less than 20 μm; and wherein, after calcination at 760° C. for 3 hours, said catalyst composition has a microporous surface area in the range of from about 400 to 600 m 2 /g-molecular sieve and further has a microporous surface area in excess of 20% of the microporous surface area of said molecular sieve alter calcination at 650° C. in nitrogen for 2 hours.