DOUBLE-COMPONENT MODIFIED MOLECULAR SIEVE WITH IMPROVED HYDROTHERMAL STABILITY AND PRODUCTION METHOD THEREOF

摘要

A method for producing double-component modified molecular sievecomprises adding molecular sieve to an aqueous solution containingphosphorus to form a mixture, allowing the mixture to react at pH of 1-10,temperature of 70-200°C and pressure of 0.2-1.2 MPa for 10-200 min, andthen filtering, drying and baking the resultant to obtain phosphorus-modifiedmolecular sieve, and then adding the phosphorus-modified molecular sieve toan aqueous solution containing silver ions, allowing the phosphorus-modifiedmolecular sieve to react with silver ions at 0-100°C in dark conditionfor30-150 min, and then filtering, drying and baking. The obtaineddouble-component modified molecular sieve contains 88-99 wt% molecularsieve with a ratio of silica to alumina between 15 and 60, 0.5-10 wt%phosphorus (based on oxides) and 0.01-2 wt% silver (based on oxides), allbased on dry matter. A catalyst produced from the double-componentmodified molecular sieve has improved hydrothermal stability andmicroactivity.