Process for making crystalline siliceous materials

Details Process for making crystalline siliceous materials Process for making crystalline siliceous materials

1985-12-23

1990-02-13

Russel, Jeffrey Edwin

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423329, 423330, 423338, 423339, 502 65, 502 68, 502 69, 502 71, C01B 3328, C01B 33113

Patent

active

049005294

ABSTRACT:
ZSM-5 crystallites are produced with very low levels of blocking tetrapropyl ammonium ions (Q). The reaction mixture contains sources of silica, soda, alumina and trace amounts of Q ions as nucleation agents. Because the crystallites as synthesized from the aqueous medium exhibit only a very small fraction of blocking cations, there is always a diffusion path for the hydrated sodium ions to be exchanged without the need of prior removal of the blocking cations by calcination or otherwise. The small size crystallites can be exchanged, blended with other materials, and formed into catalyst particles. The silica to alumina ratio can be varied and when no aluminum is added, silicalite may be formed. The systhesis can be done in 24 hours or less.

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