SYNTHESIS OF VPI-8 .1. THE EFFECTS OF REACTION COMPONENTS

The synthetic procedures used to prepare VPI-8 are outlined in this re port. VPI-8 was crystallized from reaction mixtures containing Li+, or ganic cations and zincosilicates. The effects of the concentrations of Li+, organic cations and zinc as well as the type of organic cation o n the preparation of VPI-8 were investigated. There appeared to be an optimal reaction mixture composition for the fast crystallization of V PI-8. Additionally, the absence of organic cations and/or zinc inhibit ed the formation of VPI-8. VPI-8 could be crystallized with Na+ rather than Li+ when the syntheses were seeded or at low hydroxide concentra tions, but the organic and/or zinc component must not be removed from the reaction mixture. (C) 1997 Elsevier Science B.V.