The influence of reactants and Al/Ga/Si ratios on the synthesis of CGS structured zeolites

ECR-9 (CGS) zeolites have been synthesised from gallosilicate and gallo-aluminosilicate gels at between 100 °C and 220 °C using several Al and Si reactant types. Aluminum was substituted for gallium in the framework at levels up to 20% in seeded syntheses, but higher Al substitutions promote the crystallization of impurities. This is the first report of a gallo-aluminosilicate CGS composition. We successfully used the Simulated Framework Annealing method to solve the structural topology as if ECR-9 was a novel gallosilicate. The structure was refined using Rietveld full profile analysis (wRp = 14.6%) of powder synchrotron X-ray diffraction data.