Study on the rapid crystallization of ETS-4 and ETS-10

The synthesis of ETS-10 was carried out at 200 degreesC using a 2(3) factor ial method to optimize the overall composition of reaction mixture to produ ce pure ETS-10 within a short time. The results show that ETS-10 with a hig h crystallinity and well-defined morphology was successfully synthesized at high water content and low alkalinity within 18 h of reaction. The results also show that the effect of water on crystal size and morphology was not significant. A kinetic study on ETS-10 was performed using the optimum comp osition and the apparent activation energy was calculated as 66.78 kJ/mol. In addition, a kinetic study on ETS-4 was also performed and the apparent a ctivation energy was calculated as 14.47 kJ/mol. (C) 2000 Elsevier Science B.V. All rights reserved.