Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/6120
Title: High surface area Ce<sub>0.9</sub>Cu<sub>0.1</sub>O<sub>2-<img src='/image/spc_char/delta1.gif'></sub> and Ce<sub>0.9</sub>Mn<sub>0.1</sub>O<sub>2-<img src='/image/spc_char/delta1.gif'></sub> solid solutions for CO and HCHO oxidation
Authors: Liu, Xue-Song
Lu, Ji-Qing
Jin, Ling-Yun
Xiao, Xiao-Yan
Luo, Meng-Fei
Keywords: Catalysts
Solid solutions
Oxidations
Sol-gel process
Oxides
Cerium
Copper
Manganese
Formaldehyde
Carbon monoxide
Issue Date: Oct-2009
Publisher: CSIR
Series/Report no.: Int. Cl.<sup>9</sup> C07B33/00; C01J21/00; C01J37/00
Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="chmetcnv"> Ce<sub>0.9</sub>Cu<sub>0.1</sub>O<sub>2-<img src='/image/spc_char/delta1.gif'></sub> and Ce<sub>0.9</sub>Mn<sub>0.1</sub>O<sub>2-<img src='/image/spc_char/delta1.gif'></sub> solid solutions with high surface area (> 100 m<sup>2</sup> g<sup>-1</sup>) have been prepared by a modified citrate sol-gel method. XRD results confirm the formation of Ce<sub>0.9</sub>X<sub>0.1</sub>O<sub>2-<img src='/image/spc_char/delta1.gif'></sub> (where X = Cu or Mn) solid solution. Raman results indicate that a higher concentration of oxygen vacancies is obtained on the Ce<sub>0.9</sub>Cu<sub>0.1</sub>O<sub>2-<img src='/image/spc_char/delta1.gif'></sub> catalyst compared to that of Ce<sub>0.9</sub>Mn<sub>0.1</sub>O<sub>2-</sub><sub><img src='/image/spc_char/delta1.gif'></sub>. <i style="">In situ</i> DRIFTS results show the chemisorption of CO on the Ce<sub>0.9</sub>Cu<sub>0.1</sub>O<sub>2-<img src='/image/spc_char/delta1.gif'></sub> catalyst, but there is no chemisorption of CO on the Ce<sub>0.9</sub>Mn<sub>0.1</sub>O<sub>2-</sub><sub><img src='/image/spc_char/delta1.gif'></sub> catalyst. For CO oxidation, Ce<sub>0.9</sub>Cu<sub>0.1</sub>O<sub>2-<img src='/image/spc_char/delta1.gif'></sub> shows higher activity than Ce<sub>0.9</sub>Mn<sub>0.1</sub>O<sub>2-</sub><sub><img src='/image/spc_char/delta1.gif'></sub>, due to the higher concentration of oxygen vacancies and the strong chemisorption of CO on the catalyst. For HCHO oxidation, Ce<sub>0.9</sub>Mn<sub>0.1</sub>O<sub>2-</sub><sub><img src='/image/spc_char/delta1.gif'></sub> shows slightly higher activity than Ce<sub>0.9</sub>Cu<sub>0.1</sub>O<sub>2-<img src='/image/spc_char/delta1.gif'></sub>, due to the fact that the lattice oxygen is more easily reducible in Ce<sub>0.9</sub>Mn<sub>0.1</sub>O<sub>2-</sub><sub><img src='/image/spc_char/delta1.gif'></sub> than in Ce<sub>0.9</sub>Cu<sub>0.1</sub>O<sub>2-<img src='/image/spc_char/delta1.gif'></sub>. </smarttagtype>
Description: 1352-1357
URI: http://hdl.handle.net/123456789/6120
ISSN: 0975-0975 (Online); 0376-4710 (Print)
Appears in Collections:IJC-A Vol.48A(10) [October 2009]

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