Dissertation > Excellent graduate degree dissertation topics show

Study on Preparation of Rare Earths Modified SnO2and Their Catalytic Oxidation Performance on CO and CH4Oxidation

Author: ZengXianRong
Tutor: ZhangRongBin; WangXiang
School: Nanchang University
Course: Industrial Catalysis
Keywords: SnO2 Modified by rare earth CO oxidation CH4combustion
CLC: O643.36
Type: Master's thesis
Year: 2012
Downloads: 26
Quote: 0
Read: Download Dissertation

Abstract


SnO2is an n-type semiconductor, which is widespread used in gas sensors, catalytic materials and semiconductor materials. Because of its surface oxygen species, SnO2is attracted more attention. When mixed with other metal, it would inform new co-oxides, which shows more obvious catalytic activity. The catalytic of catalysts is related to the surface oxigens of SnO2.With SnCl4·5H2O and Ce(NO3)3·6H2O as raw material, Sn-Cel2、Sn-Cell and Sn-Ce21samples were prepared by coprecipitation method. CO and CH4oxidation were used as probe reaction to examine the catalytic activity. Also, N2-BET、XRD and H2-TPR were used to characterize the structure and performance of the catalysts.A series of different molar ratios was analysed in detail. In order to find the best molar ratio which has better activity for CO and CH4oxidation, Sn-Ce91, Sn-Ce73, Sn-Ce55, Sn-Ce37, Sn-Cel9were prepared by coprecipitation method. Finally, we found that the catalyst of Sn-Ce73had the best activity.Catalysts prepared by different methods such as impregnation, sol-gel were used to prepared and used to CO and CH4oxidation, which were used to compare with chemical coprecipitation method.Different rare earths such as lanthanum, cerium and yttrium were used to modified SnO2with the2/1atomic ratio prepared by coprecipitation method. We found that cerium showed higher activity for CO and CH4oxidation because it formed solid solution. However, lanthanum and yttrium modified samples formed steady composite oxides, which were impeded for catalytic oxidation.The carrier of SnO2and CeO2were prepared CeO2/SnO2and SnO2/CeO2catalysts and then used in CH4catalytic oxidation. The results found that the carried catalyst had better catalytic performance than pure carriers, also CeO2/SnO2was better than SnO2/CeO2.

Related Dissertations

  1. Iron-doped SnO \u003csub\u003e 2 \u003c/ sub\u003e ceramics and thin films research,TQ174.6
  2. Controlling the morphology of cerium -based oxides Preparation and Catalytic Oxidation,O614.332
  3. Ceria -based materials Preparation and Characterization of Its Properties,TB383.1
  4. The Study of Preparation and Photocatalytic of Compound Nanomaterials TiO2/SnO2,O643.36
  5. Modification of Iodine Doped Titanium Dioxide for the Photodegradation of 2-chlorophenol,O643.32
  6. Investigation on the Electrode Process of V(Ⅳ)/V(Ⅴ) Species and Modification of Graphite Felt as Electrode in a Vanadium Redox Flow Battery,TM912
  7. Synthesis of Cerium-doped Mesoporous Materials and Its Catalytic Performances for Oxidation Reactions,O643.36
  8. Study on Wet Air Oxidation of Antibiotics,X787
  9. The Research on Preparation and Gas Sensitivity of SnO2 /gold Composite Materials,TB33
  10. Biotemplate Fabrication of SnO2 and WO3 Hierarchical Structures and Their Gas-sensing Properties,TB383.1
  11. Electrocatalytic oxidation dye wastewater treatment,X703
  12. Template Synthesis of Ag/TiO2, Ni2+/TiO2, SnO2/ZnO Hollow Nano-fibers and Research of Their Photocatalytic Properties,O643.36
  13. Preparation of CuO-substrate Composite Oxide Catalysts and Their Catalytic Activities for CO Oxidation at Low Temperature,O643.36
  14. The Growth, Characterization, and Applications of Doped SnO2 Nanowires,TB383.1
  15. Preparation of Modified SBA-15 and Its Application in CO Oxidation Reaction,O643.36
  16. Preparation of Thin-film Solar Cell Window Material SnO2 by PECVD and Its Performance Research,TM914.42
  17. Reaction synthesis of silver tin oxide material the nanoparticle first principle molecular dynamics study,TB383.1
  18. Theoretical Study of the CO Oxidation and Formation of Methyl Formate from Methanol Catalyzed by Gold Clusters,TQ225.241
  19. Technology of Co-oxidation to Prepare Propylene Oxide from Tert-butyl Hydrogen Peroxide and Propylene,TQ223.26
  20. The Controllable Preparation of CeO2 Nanostructure Materials and Gold Loaded Catalysts for CO Oxidation,O643.36
  21. The Preparation、Characterization and Catalytic Performance of Metal-doped SBA-15,O643.36

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