Preparation of Titania-based CoPc Catalysts for CO2 Photocatalytic Reduction by the In-situ Method

doi:10.7517/j.issn.1674-0475.2009.04.263

Abstract

Abstract: Applying a new method of in-situ chemical synthesis through the annulation of 1,2-dicyanobenzene on the surface of TiO₂ with Co(Ⅱ) as template,cobalt phthalocyanine(CoPc) is synthesized in the processing of TiO₂ gel synthesis and obtained the catalyst of CoPc/TiO₂.CoPc is doped successfully and the catalysts are verified by means of UV-Vis and FT-IR.The optimum preparation conditions of CoPc/TiO₂ are as follows:n(CoPc):n(TiO₂)=3:100,calcination temperature 200℃,stirring time 20h,titanium tetra-butoxide,1,2-dicyanobenzene and cobalt ion adding at the same time.By this method the the electron density of Pc rings in CoPc is increased and favored to transfer electrons from excited CoPc to the conduction band of TiO₂.CoPc was isolated homogeneously in the pores of the titania matrix.This kind of “cage effect” effectively prevented the CoPc molecules from migrating to adjacent pores,thus decreasing the dimerization and aggregation of CoPc molecules.This catalyst can be apply to photocatalytic reduce CO₂,exposure under visible light,in the water solution,CO₂ can be reduced to HCHO,CH₃OH,HCOOH and so on.After 10 h of photo-reaction,the cumulative production can reach 2903.83μmol/g-catal.

Key words: in-situ method, CO₂ photo-reduce, TiO₂, cobalt phthalocyanine, photocatalysis

CLC Number:

FAN Ji-min, ZHAO Zhi-huan, WANG Zhi-zhong. Preparation of Titania-based CoPc Catalysts for CO₂ Photocatalytic Reduction by the In-situ Method[J]. Imaging Science and Photochemistry, 2009, 27(4): 263-272.

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Preparation of Titania-based CoPc Catalysts for CO₂ Photocatalytic Reduction by the In-situ Method

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