PRODUCTION OF LOWER OLEFIN COMPOSED MAINLY OF PROPYLENE

摘要

PURPOSE:To obtain the subject substance in high selectivity and conversion by contacting hydrocarbons composed mainly of 3-10C paraffins with a crystalline aluminosilicate zeolite catalyst supporting a specific amount of silver or further phosphorus. CONSTITUTION:The subject substance can be produced in high yield by contacting hydrocarbons composed mainly of 3-10C paraffins with a specific crystalline aluminosilicate zeolite catalyst at 450-600 deg.C. The above catalyst is produced preferably by supporting 0.1-50wt.% of silver, or further 0.1-5.0wt.% of phosphorus on a ZSM-5 zeolite having an SiO2/Al2O3 molar ratio of >=25. The addition of phosphorus is effective in suppressing the deposition of coke without deteriorating the characteristic properties of silver and in improving the stability of the catalyst to hot steam.