Microwave-assisted Heterogeneous Photocatalytic Oxidation of Ethylene

Abstract

Abstract: Porous TiO₂ and SO₄^2-/TiO₂ catalysts were prepared by sol-gel method and charaterized by XRD, N₂ sorption analysis applying BETmethod, and microwave absorption spectrum. Photocatalytic oxidation of C₂H₄ in air stream was studied. The results showed that the photocatalytic activity of both SO₄^2-/TiO₂ and TiO₂ catalysts was obviously increased under the reaction condition of ultraviolet combined with microwave. The conversions of ethylene over TiO₂ and SO₄^2-/TiO₂ were enhanced from 20% and 41%(UV) to 27% and 62%(UV+MW), respectively. The effect of MWon SO₄^2-/TiO₂ catalyst was more notable. The improvement on photocatalytic activity was attributed to the polarization effect of the highly defected catalysts in microwave field, which increased the transition probability of photon generated electrons and decreased the electron-hole recombination on semiconductor surface.

Key words: Nano-titania, Photocatalytic oxidation, Microwave, Ethylene

CLC Number:

O643/X7

TrendMD:

ZHENG Yi, LI Dan-Zhen, FU Xian-Zhi . Microwave-assisted Heterogeneous Photocatalytic Oxidation of Ethylene[J]. Chem. J. Chinese Universities, 2001, 22(3): 443.

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Microwave-assisted Heterogeneous Photocatalytic Oxidation of Ethylene

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