Catalytic decomposition of methylene chloride in air below 300℃ was studied.Sulfated titania was very effective in converting 959ppm methylene chloride selectively to CO,CO2 and HCl.Complete decomposition of methylene chloride was achieved at low temperature(275℃).It was found that the acidic property of catalyst was a determinant factor for the catalytic activity.The presence of water vapor in the feed stream remarkably reduced the catalytic activity,which could be due to the blockage of acidic sites on the surface of catalyst by water molecules.A bifunctional catalyst comprising copper oxide was developed to improve the selectivity of catalytic oxidation,which indicated that copper oxide can promote the deep oxidation of methylene chloride.The crystal form of TiO2 imposes an important influence upon the catalytic oxidation.
参考文献
| [1] | T Dockner;M Sauderwald;H Krug;M Irgang .Reductive Dehalogenation of Organic Halogen Compounds[P].US 4943671,1990. |
| [2] | Haber kJerzy;Machej Tadeusz .Catalytic Oxidation of CH2Cl2 on Sodium Doped Al2O3[J].Catalysis Today,1999,54(01):47-55. |
| [3] | A D Harley .Process and Catalyst for the Dehydrohalogenation of Halogenated Hydrocarbons[P].US:4816609,1989. |
| [4] | Janas J;Janik R;Machej T;Serwicka E M .Cr-doped Zr,Si-mesoporous Molecular Sieves as Catalysts of CH2Cl2 Oxidation[J].Catalysis Today,2000,59(3-4):241-248. |
| [5] | Corella Jose .On the selection of the catalyst among the commercial platinum-based ones for total oxidation of some chlorinated hydrocarbons[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2000(4):243-256. |
| [6] | A K Ghosh;G L Curthoys .Synthesis and Characterization of Titania Aerogels[J].Physical Chemistry,1984,88:1130-1133. |
| [7] | J Laidler.Chemical Kinetics[M].New York:Harper and Row Publishing,1987 |
| [8] | Huang Yin-yan;Zhao Bi-ying;Xie You-chang .A Novel Way to Prepare Silica Supported Sulfated Titania[J].Applied Catalysis A:General,1998,171:65-73. |
| [9] | L K Campbell;B K Na;E I Ko.Characterization of Zeolite Acidity:A Thermal Study of n-butylamine and Ammonia Adsorbed on Mordenites[J].Chemical Master,1992(04):1329-1333. |
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