Dissertation > Excellent graduate degree dissertation topics show

Study on the Preparation of Perovskite-type NSR Catalysts BaFe1-xTixO3 and Their NOx Storage and Sulfur Resistance Behaviors

Author: LiLingYun
Tutor: LiXinGang
School: Tianjin University
Course: Industrial Catalysis
Keywords: BaFe1-xTixO3 perovskite impregnation NO_x storage sulfur resistance
CLC: O643.36
Type: Master's thesis
Year: 2010
Downloads: 13
Quote: 0
Read: Download Dissertation

Abstract


In this paper, the sol-gel and impregnation methods were employed to prepare the BaFe1-xTixO3 （x=0.1, 0.2, 0.3） perovskite-type NSR catalysts. The BET, XRD, FT-IR, DRIFTS, H2-TPR, and XPS were employed to characterize the structure and adsorption/desorption properties of the catalyst. The NOx storage capacity （NSC） and sulfur resistance were also investigated and discussed with the results of the characterizations.The catalytic activity test showed that the sulfur resistance of BaFe1-xTixO3 catalysts was greatly improved by doping Ti in the BaFeO3 catalyst. When the proportion of the doped titanium reached 20 % by the impregnation method, the Imp-Ti0.2 sample exhibited the good NOx storage capacity as well as the high sulfur resistance, i.e. NSC = 1000μmol/g and the NSC only decreasing about 5.1 % comparing with the fresh catalyst. Nevertheless, after sulfation, the NSC of the BaFeO3 sample reduce 21.2 %,and the reduced ratio of the conversion of NO just was 31.3 %. The addition of titanium increased the surface area of the catalyst, leading to the excellent dispersion of the active sites on the catalyst, and also, the amount of BaCO3 formed during preparation also suppressed significantly. After sulfation, there were not only BaSO4 but also Fe2（SO4）3 formed on the surface of catalysts causing a slight decrease of the NSC. Calcinating the catalysts at higher temperature could reduce the quantity of BaCO3 in the perovskite-type catalyst, but the catalytic activity also decreased simultaneously. In conclusion, the Imp-Ti0.2-750 sample exhibited the best NOx storage capacity and sulfur resistence property.

Related Dissertations

  1. Competitive Adsorption of Phenolic/Ethanol onto Silica Fiber Effected by Ultrasound in RTM Process,TB332
  2. Preparation and Photocatalytic Properties of Semiconductor Oxides,O643.36
  3. The Study of TWC Catalytic Removal NOx from Waste Incineration Flue Gas,O643.36
  4. Phosphate modification of nano- TiO 2 Photoelectrochemical Properties of the,TB383.1
  5. Synthesis, Conducting Properties and Application of Bax Ce0.8Y0.2O3-α + yZnO,TQ174.1
  6. (Class ) perovskite -type oxides catalytic elimination of N 2 O,X701
  7. Resistant chromium poisoning , high-performance solid oxide fuel cell cathode materials research,TM911.4
  8. Pollen template based indium oxide gas sensing materials research,TB381
  9. Modified LaMnO 3 perovskites for catalytic combustion of low concentration methane,O643.36
  10. Composite textile -based branch of the design and preparation of artificial blood vessels,TS106.67
  11. Boron nitride fiber reinforced ceramic matrix composites through the waves and Properties,TB332
  12. Containing iron TiO 2 Nanotube Adsorption removal of As (Ⅴ) study,X703
  13. Vacuum impregnation production line control system research and design,TP273
  14. The Effect of Pd Doping and Chemical Pd-plating on the Electric-Magneto Transport Properties in LCSMO System,O482.5
  15. Study on the Synthesis of La0.8K（0.2）FeO3 Perovskite Composites and the Photocatalytic Degradation of Dye Wastewater,X703.1
  16. Study of Catalytic Properties of La1-yKyCo1-xFexO3 for Reducing NO by Soot under Lean Burn,TQ426.96
  17. Processing and Characterization of Short Fiber-reinforced Aluminium Matrix Composites,TB333
  18. CaTiO_3-NdAlO_3 Preparation and microwave dielectric properties of ceramics,TQ174.6
  19. Influence of Elevated Temperature on the Protective Effectiveness of Silane Agent,TU528.1
  20. Fabrication and Properties of BaZrO3/BaCeO3-Based Composite Proton Conductors,O611.4
  21. The Study of Light Absorption Charateristics of Doped Complex Oxide with Perovskite Stucture,O643.36

CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
© 2012 www.DissertationTopic.Net  Mobile