Effect of synthesis parameters on tma+-free microporous vanadosilicate am-6

Hydrothermal synthesis of tetramethylammonium cation (TMA+)-free vanadosilicate AM-6 was carried out with molar composition of 1.44Na2O : 0.20K2O : ySiO2 : 0.10V2O5 : zH20 : 0.35F; where y = 1.1-2.2, and z = 35-250 w at 503 K and 473 K. Low Si content and high H2O content resulted in larger crystals with accompanied quartz impurities. Synthesis with y = 2.2 and z = 35 at 473 K resulted in pure, nano-sized AM-6 products. This was evidenced by both XRD and SEM analyses. UV-Vis spectroscopic analysis of the pure product showed the typical broard absorption in the 200 350 nm region, as well as the visible light absorption features around 400 nm and 595 nm, indicative of AM-6. †Corresponding author: ismailm@simmons.edu