PHOTOREDUCTION OF CO2 IN THE SUSPENSION SYSTEM OF SEMICONDUCTOR CATALYST TiO2 MODIFIED BY PALLADIUM

doi:10.7517/j.issn.1674-0475.1999.01.61

Imaging Science and Photochemistry ›› 1999, Vol. 17 ›› Issue (1): 61-65.DOI: 10.7517/j.issn.1674-0475.1999.01.61

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PHOTOREDUCTION OF CO₂ IN THE SUSPENSION SYSTEM OF SEMICONDUCTOR CATALYST TiO₂ MODIFIED BY PALLADIUM

XU Yongjun¹, CHEN Fuming², JIANG Linlin¹, ZHOU Ding³

1. Daqing Staffs and Workers University, Daqing 163255, P. R. China;
2. Department of Chemical Engineering, Tsinghua University, Beijing 100084, P. R. China;
3. Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150006, P. R. Ch

Received:1998-03-09 Revised:1998-09-28 Online:1999-02-20 Published:1999-02-20

Abstract

Abstract: The experiment of photoreduction of CO₂ was made in the suspension system of Pd/TiO₂ under the illumination of visible light. The findings from the experiments are: (1) Formic acid is the major product of the photoreduction process and its quantum yield is relatively high; (2) The reaction rate increases with the increase of the illumination intensity as well as the feed flowrate of CO₂. It can also be increased by adding an electron donor to the system and the increasing capacity is in the sequence of Na₂C₂O₄>Na₂SO₃>NaH₂PO₂; (3) The photoreduction process was found to be an opposing reaction by dynamics analysis. A model of reaction mechanism, by which the calculated result consisted well with the experimental one, was proposed.

Key words: carbon dioxide, photoreduction, semiconductor photocatalyst, titanium dioxide, palladium

XU Yongjun, CHEN Fuming, JIANG Linlin, ZHOU Ding. PHOTOREDUCTION OF CO₂ IN THE SUSPENSION SYSTEM OF SEMICONDUCTOR CATALYST TiO₂ MODIFIED BY PALLADIUM[J]. Imaging Science and Photochemistry, 1999, 17(1): 61-65.

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PHOTOREDUCTION OF CO₂ IN THE SUSPENSION SYSTEM OF SEMICONDUCTOR CATALYST TiO₂ MODIFIED BY PALLADIUM

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