Silylation of layered zirconium hydroxy phosphate and its porous properties

Silylation of layered zirconium hydroxy phosphate was carried out and its porous properties were examined. The novel layered hydroxy phosphate was protonated and intercalated by using octylamine to expand the interlayer space. Then, dimethyldichlorosilane, dichloromethylvinylsilane or 1,2-bisdimethylchlorosilylethane were used to silylate the interlayer space. In order to form micropores between layers, the silylated compounds were heated at the range from 100 C to 1,000 C to measure high-temperature XRD patterns. During heating, the interlayer spacing decreased at around 300 and 600–700 C. The specific surface area reached around 180 m2/g as maximum area at 300 C, while layered structure collapsed gradually above 400 C. Micropore volume also became maximum at 300 C.