Synthesis of Thermally Stable, Phosphorus-Modified Titanium Oxide Nano-Crystals by Thermal Decomposition of Titanium Alkoxide and Phosphoric Ester in Organic Solvent of High Temperature and High Pressure

摘要

Phosphorous-modified titanium oxide (P-TiO_2'S) nano-crystals in anatase form were synthesized by thermal decomposition of mixtures of titanium (IV) isopropoxide and ethyl phosphate in toluene in autoclave at 300 deg C. These P-TiO_2's had high rutile-transformation temperatures and maintained large specific surface areas even at elevated temperatures (550-800 deg C). For example, the product prepared from a mixture of Ti/P molar ration of 19 transformed into rutile at around 1000 deg C, and it possessed a specific surface area of 54 m~2 centre dot g~(-1), even after calcination at 800 deg C for 1 h.