Effects of Doping CeO_2, Er_2O_3 on Properties of TiO_2-SiO_2 Ceramics for Catalyst Supporter of deNO_x

摘要

Effects of doping CeO_2 and Er_2O_3 on the mechanical strength, thermal expansion coefficient, sintering temperature of TiO_2-SiO_2 ceramics were investigated. The experimental results and the microscopic analysis of SEM, XRD, TG-DSC, FT-IR and TEM show that adding CeO_2 and Er_2O_3 into TiO_2-SiO_2 ceramics can prohibit the growth of its crystal grains, make their size uniform and form them into a dense structure, which finally enhance its mechanical behaviors, and the lower thermal expansion coefficient that leads to an excellent property of thermal shock resistance. After the reforming TiO_2-SiO_2 ceramics doped by CeO_2 was sintered at 1380 ℃ , the bending strength reached to 83 Mpa, and the thermal expansion coefficient was 9.8 × 10~(-6)/℃ within the temperature range of 25 ～ 800 ℃ , which provides a promising basis of making equipped honeycomb catalyst of deNO_x.