Substitution of cr and/or sn in place of a1 in the framework of molecular sieve via treatment with fluoride salts

Abstract From the Canadian patent

D-15,753, SUBSTITUTION OF Cr AND/OR Sn IN PLACE OF Al IN THE FRAMEWORK OF MOLECULAR SIEVE VIA TREATMENT WITH FLUORIDE SALTS, ABSTRACT OF THE DISCLOSURE Molecular sieve compositions are prepared by extracting aluminum and substituting chromium and/or tin for extracted aluminum to give molecular sieve products containing framework chromium and/or tin atoms. The process of preparing the chromium and/or tin-containing molecular sieves invloves contacting a starting molecular sieve with a solution or slurry of at least one of a fluoro salt of chromium or a fluoro salt of tin under effective process conditions to provide for aluminum extraction and substitution of chromium and/or tin. 0527u