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CO Oxidation on Nb and Ta-Modified SnO2Solid Solution Catalysts

Author: HanXue
Tutor: ZhangRongBin
School: Nanchang University
Course: Industrial Catalysis
Keywords: SnO2catalyst niobia tantala Solid solution CO oxidation
CLC: TQ426
Type: Master's thesis
Year: 2013
Downloads: 16
Quote: 0
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Abstract


Co-precipitation method was used to prepare Sn-Nb-O and Sn-Ta-O binary catalysts with different Sn/Nb or Sn/Ta molar ratios and used for CO oxidation. The catalysts were investigated by N2adsortion-desorption (N2-BET), X-ray podwer diffraction (XRD), H2-temperature programmed reduction (H2-TPR), Thermal Gravity Analysis-Differential Scanning Calorimetry (TG-DSC) techniques. It is revealed that a small amount of Nb or Ta cations can be doped into tetragonal Rutile SnO2crystall lattice to form solid solution structures, which resulted in samples having higher surface areas, improved thermal stability and more deficient oxygen species on the surface. As a result, those Sn rich Sn-Nb or Sn-Ta solid solution catalysts showed significantly enhanced activity as well as better resistance to water deactivation. It is noted here that if niobia or tantala disperses onto SnO2surface instead of doping into its crystal lattice, it will then have negative effect on its activity.

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Catalyst ( catalyst )
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