Microporous zincophosphates

P-23 - Microporous zincophosphates as solid base catalysts L.A. Garcia-Serrano, T Blasco, J. Perez-Pariente and E. Sastre... 

Microporous zincophosphate crystals of zeolitic structure have been synthesized by Dutta and colleagues [335, 222] via multiple microemulsions. In the first investigation [335], these authors used two reverse microemulsions, based on the system AOT/n-hexane, containing (a) aqueous solution of Zn(N03)2.6H20 and (b) aqueous solution with H3PO4 and tetramethylammonium hydroxide (the latter was required for incorporation of the phosphate in the reverse micelle). For the Zn-micelle, the [AOT]/[H20] ratio was 13, while for the phosphate-micelle, the value went up to 21. Uptake of the constituents in the micelles was examined by chemical analysis. The two microemulsions were finally mixed at room temperature. Particles grew from 14 nm to - 150 nm in three days, and then became stable at --140 nm. 

R. Singh and P. K. Dutta, Crystal growth of faujasitic microporous zincophosphate crystals using... 

Broach RW, Bedard RL, Song SG, Pluth JJ, Bram A, Riekel C, Weber H-P (1999) Synthesis and characterization of ZP-4 (KznPO4 0.8H2O), a new zincophosphate microporous material Structure solution from a 2.5 2.5 x 8 gm single crystal using a third generation synchrotron X-ray source. Chem Materials 11 2076-2080... 

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