反应详情

A tin (IV) chloride pentahydrate (Aldrich) solution was prepared by addition of the solid to distilled water; 20% colloidal alumina (AL-20, PQ Corp.) was stirred into this solution and a white precipitate formed. An aqueous potassium hydroxide (Fisher) solution was added to the tin chloride solution and stirred; colloidal silica (HS-40, DuPont) was added to the mixture (to give a final reactant ratio of 2K2O:3.8SiO2 :SnO2 :0.1Al2O3 :80H2O) and the resulting gel stirred until homogeneous. The gel was reacted in a polytetrafluoroethylene-lined autoclave (Parr) at 200° C. for 21 days to produce a white solid after the reactor was cooled to room temperature. This solid was washed repeatedly with distilled water, filtered, and dried to yield a fine white powder (Phase G). Chemical analysis indicated 13.67% K, 22.82% Sn, 18.69% Si, and 0.92% Al. A typical X-ray diffraction pattern for Phase G is given in Table 6.

1. distillationto distilled water
2. customa white precipitate formed
3. stirringstirred
4. additioncolloidal silica (HS-40, DuPont) was added to the mixture (