Crystalline molecular sieves and related structure-directing agents, methods and systems

摘要

A composition and method for preparing molecular sieves having a STW framework structure are described wherein a structure directing agent comprising quaternary cation 1,2,3,4,5-pentamethyl-1H-imidazol-3-ium is contacted with a source of an oxide of a first tetravalent element with or without a source of an oxide of another tetravalent elements and/or a source of a trivalent element in a molar ratio of tetravalent element:trivalent element 100:1 and greater.

主权项

1. A method for preparing a molecular sieve having an STW framework, the method comprising:
hydrothermally treating a reaction mixture for a time and under conditions to form an as-synthesized molecular sieve having the STW framework, the reaction mixture comprising:
a first organic structure directing agent (1) having an associated organic or an inorganic anion, a source of an oxide of a first tetravalent element,optionally a source of fluoride,optionally a second organic structure directing agent, andoptionally a seed crystal having an STW framework, the method forming the as-synthesized molecular sieve having the STW framework.