The mixed oxides, VCe and VCe0.95M0.05 (M=Cu, Co, Mn, Fe and Cr), we re prepared by sol-gel method. The structure and redox properties of these mixe d oxides were characterized by XRD, Raman, XPS and TPR techniques. The main phas e is tetragonal VCeO4 phase in all samples. The substitution of Fe, Mn, Cu or Co for Ce results in the formation of CeO2 or monoclinic VCeO4 phase. The XP S result indicates that valence of V is +5+δ(δ＜1) in VCe0.95Co0 .05, VCe0.95Mn0.05, VCe0.95Cr0.05 and VCe0.95Fe 0.05 samples compared with VCe , on the contrary, valence of V is +5-δ (δ＜1) in VCe0.95Cu0.05 sample. The Fe, Co, Cr and Mn enhanc e the reduction of V5+ in VCeO4, whereas Cu inhibits this reduction.
参考文献
| [1] | Busca G;Marchetti L .Surface characterization of a gr aftdd varadium-titanum dioxide catalyst[J].Journal of the Chemical Society,Faraday Transactions,1985,81:1003. |
| [2] | Dias C R;Portela M F;Bond G C .Oxidation of o-xylene to pht halic anhydride over V2O2/TiO2 catalysts[J].Journal of Catalysis,1995,157:344. |
| [3] | Mamedov EA.;Corberan VC. .OXIDATIVE DEHYDROGENATION OF LOWER ALKANES ON VANADIUM OXIDE-BASED CATALYSTS - THE PRESENT STATE OF THE ART AND OUTLOOKS [Review][J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,1995(1/2):1-40. |
| [4] | Narayana KV;Masthan SK;Rao VV;Rao PK .CeF3 as a novel support for preparing highly active and selective vanadia catalysts for the ammoxidation of 3-picoline[J].Journal of Chemical Research. Synopses,1997(9):328-329. |
| [5] | Hughes B M F;Hill G R .Rate law and mechanism for the oxidati on of carbon monoxide over a vanadiums oxide catalyst[J].Journal of Physical Chemistry,1955,59:388. |
| [6] | Simard G I;Steger J F;Arnott R J et al.Vanadium oxides as oxidation catalysts[J].Industrial and Engineering Chemistry Research,1955,47:1424. |
| [7] | Matsuura R .The Reduction of spherical vanadium pentoxide grai ns in the hydrogen stream[J].Nippon Kagaku Kzasshi,1961,82:417. |
| [8] | Cousin R;Dourdin M;Abi-Aad E et al.Formation of CeVO4 p hase during the preparation of CuVCe oxide catalysts[J].Journal of the Chemical Society,Faraday Transactions,1997,93:3863. |
| [9] | Luo M F;Zhong Y J;Yuan X X et al.TPR and TPD studies of Cu O/CeO2 catalysts for low temperature CO oxidation[J].Applied Catalysis A:General,1997,162:121. |
| [10] | Dines T J;Rochester C H;Ward A M .Raman spectroscopic study of tita nia-spported vanadia catalysts[J].Journal of the Chemical Society,Faraday Transactions,1991,87:653. |
| [11] | Wagner C D;Riggs W M;Moulder J E;Moilenberg G E Eds.Handbook of X-ray Photoelectron Spectroscopg[M].Beijing:Perkin-Elmer Corp Eden Prai rie,1979 |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%