Preparation and Performance of Al₂ TiO₅ -TiO₂ -SiO₂ Honeycomb Ceramics by Doping Rare Earth

Abstract: A preferable honeycomb ceramics of Al₂TiO₅-TiO₂-SiO₂ doped by CeO₂ and Er₂O₃ with high performance was prepared by means of extrusion molding and the effects of CeO₂ and Er₂O₃ on the mechanical strength, thermal stability, and sintering temperature of ATS ceramics were mainly investigated. The experimental results and the microscopic analysis by scanning electron microscope, X-ray powder diffraction, and TG-DSC showed that adding CeO₂ and Er₂O₃ into ATS could prohibit the growth of their crystal grains and make their size uniform, which finally decrease its sintering temperature, and also enhance its mechanical performance as well as thermal stability. After the reforming, ATS doped by 0.5%CeO₂ +0.5%Er₂O₃ was sintered at 1250 °C, its bending strength reached to 177.4 MPa and thermal expansion coefficient was 3.8 × 10^-6/°C at 25 ∼ 1000 °C, which provided a promising basis of making monolithic honeycomb catalyst of deNO_x.