TRIBOCHEMICAL REACTION BETWEEN NA-LTA AND ALPO4.3H2O

The tribochemical reaction between Na-LTA and AlPO4.3H2O leads to a decrease of the phosphate phase with the corresponding increase in the zeolite phase. The process is accompanied by release of the phosphate crystallization water and the disappearance of the characteristic IR bands of the AlPO4. Control experiments established that there is no effect on milling the individual reactants. The reaction products exhibit adsorption properties characteristic of molecular sieves. These facts points to the formation of a SAPO molecular sieve with LTA structure.