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Acta Physico-Chimica Sinica  2001, Vol. 17 Issue (03): 278-281    DOI: 10.3866/PKU.WHXB20010320
Article     
Mechnism of Photocatalytic Oxidation of Formaldehyde
Yang Jian-Jun;Li Dong-Xu;Li Qing-Lin;Zhang Zhi-Jun;Wang Han-Qing
Lanzhou Institute of Chemical Physics,Chinese Academy of Science,Lanzhou 730000;Key Lab of Lubrication and Functional Materials,Henan University,Kaifeng 475001
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Abstract  The adsorption state of reactants,free radical intermediates and the r eaction mechanism have been studied by means of temperature programmed descripti on (TPD),electron spin resonance (ESR) and spin trapingESR in the photocatalyt ic oxidation of formaldehyde.The results showed that O2 adsorbed on the surface of photocatalyst could be reduced to •O-2 by photogenerated electrons and H2O could be oxidized to •OH by holes.Both free radicals are active oxidants in the reaction of photocatalytic oxidation of HCHO.The photocatalytic oxidation of HC HO carried out with two steps.Firstly,HCHO was oxidized into HCOOH,then HCOOH co nverted into final product of CO2 and H2O.

Key wordsFormaldehyde      Photocatalytic oxidation      Temperature programmed deso rption      Electron spin resonance     
Received: 08 October 2000      Published: 15 March 2001
Corresponding Authors: Li Qing-Lin     E-mail: qlli01@371.net
Cite this article:

Yang Jian-Jun;Li Dong-Xu;Li Qing-Lin;Zhang Zhi-Jun;Wang Han-Qing. Mechnism of Photocatalytic Oxidation of Formaldehyde. Acta Physico-Chimica Sinica, 2001, 17(03): 278-281.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20010320     OR     http://www.whxb.pku.edu.cn/Y2001/V17/I03/278

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