Preparation of zeolite

A process for preparing zeolite, comprising the steps of:

• providing a mixture of a zeolite source, an organic structure directing substance selected from the group consisting of N,N′-bis-triethyl-1,7-heptanediyl-diammonium dihydroxide, N,N′-bis-triethyl-1,8-octanediyl-diammonium dihydroxide, N,N′-bis-triethyl-10 1,9-nonanediyl-diammonium dihydroxide, N,N′-bis-triethyl-1,10-decanediyl-diammonium dihydroxide, and their salts, and water,
• drying said mixture to form a powdered dry gel, and
• contacting and reacting said dry gel with steam at a saturated vapor pressure to produce an aluminum-containing zeolite.

A process for preparing zeolite [Al]-SSZ-31, comprising the steps of

• providing a mixture of a zeolite source, an aluminum-containing material, an organic structure directing substance which is N,N′-bis-triethyl-1,6-hexanediyl-diammonium dihydroxide or its salt and water,
• drying said mixture to form a powdered dry gel, and
• contacting and reacting said dry gel with water steam at a saturated vapor pressure to produce an aluminum-containing zeolite [Al]-SSZ-31.

A process for preparing zeolite, comprising the steps of:

• providing a mixture of a zeolite source, an organic structure directing substance which is N,N′-bis-triethyl-1,6-hexanediyl-diammonium dihydroxide or its salt and water,
• drying said mixture to form a powdered dry gel, and
• contacting and reacting said dry gel with steam at a saturated vapor pressure to produce an aluminum-containing zeolite.