METHOD FOR PREPARING HIGH-IRON CONTENT FE-ZSM-5 MOLECULAR SIEVE

摘要

A method for preparing a high-iron content Fe-ZSM-5 molecular sieve. Under a condition where no organic amine template is used, an appropriate silicon source, alkali source, aluminium source, and iron source are first selected, a seed crystal is added, and a hydrothermal synthesis method is adopted; crystallization at a constant temperature is performed to obtain a slurry of an NaFe-ZSM-5 molecular sieve a framework of which contains iron, the slurry is subjected to exchange with an acidic solution and waching to obtain low-sodium Fe-ZSM-5, and the low-sodium Fe-ZSM-5 is uniformly mixed with an inorganic iron salt solution; exchange, washing and drying at constant temperatures and then roasting are performed to obtain high-iron content hydrogen-type Fe-ZSM-5. No organic amine template is used, a plurality of inorganic silicon sources, aluminium sources, and iron sources, and a seed crystal are adopted to prepare the Fe-ZSM-5 molecular sieve with an iron content higher than 6% by means of the hydrothermal synthesis method and ion exchange. Industrialization production is easily achieved, and no environment pollution problem due to removal of a template will occur. The iron content is increased on the surface of a molecular sieve by means of a single ion exchange method, so that the iron element in and out of the framework of the molecular sieve can be uniformly distributed, and the relative crystallization degree of the Fe-ZSM-5 molecular sieve can be kept to a maximum degree.