Dopants for synthesis of stable bimodally porous titania

摘要: Abstract Bimodally porous titania powders doped with alumina, zirconia, and silica were made by wet precipitation from organometallic precursors (for Al/Ti=0.05-0.4, Zr/Ti=Si/Ti=0.1). Doping retards not only the anatase-to-rutile phase transformation, but also crystallite growth of titania. So it was used to control powder composition pore structure at high temperatures. The extent retarding effect on transformation increased increasing alumina concentration. effectiveness these dopants follows order of: zirconia>silica>alumina. reduce loss surface area calcined decreasing sintering rates. All exhibited bimodal size distributions (PSD) fine intra-particle pores (1–4 nm) larger inter-particle (10–120 nm). However, pure disappeared 600°C, while PSD maintained up 750°C.