Effects of Co3O4 Cocatalyst on InTaO4 for Photocatalytic Reduction of CO2 to CH3OH under Visible Light Irradiation - Modern Research in Catalysis

MRC > Vol.8 No.4, October 2019

Modern Research in Catalysis

Volume 8, Issue 4 (October 2019)

ISSN Print: 2168-4480 ISSN Online: 2168-4499

Google-based Impact Factor: 1.83 Citations

Effects of Co3O4 Cocatalyst on InTaO4 for Photocatalytic Reduction of CO2 to CH3OH under Visible Light Irradiation ()

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Download as PDF (Size: 1133KB) PP. 39-49

DOI: 10.4236/mrc.2019.84004 561 Downloads 1,586 Views Citations

Author(s)

Pei-Wen Pan¹, Yu-Wen Chen^1*, Anton S. Brichkov², Vladimir V. Kozik²

Affiliation(s)

¹Department of Chemical Engineering, National Central University, Taoyuan City.
²Department of Chemistry, Tomsk State University, Tomsk, Russia.

ABSTRACT

InTaO₄ was synthesized by a solid-state reaction method using metal oxide as the starting materials. Co was added by incipient-wetness impregnation. The sample was pretreated by H₂ (200 Torr) reduction at 500?C for 2 h and subsequent O₂ (100 Torr) oxidation at 200?C for 1 h. The core-shell structure of metallic Co and Co₃O₄ was formed by this reduction-oxidation procedure. The catalysts were characterized by powder X-ray diffraction, scanning electron microscope, and ultraviolet-visible spectroscope. The photocatalytic reduction was carried out in a Pyrex reactor with KHCO₃ or NaOH aqueous solution bubbled with ultra pure CO₂ gas under visible light illumination. SEM micrographs show many small Co₃O₄ particles on the surface of InTaO₄. The band gap of Co₃O₄-InTaO₄ was 2.7 eV, confirming that these catalysts have the ability to reduce CO₂ to methanol. The methanol yield increased with the amount of Co₃O₄ cocatalysts. The catalyst had a higher activity in KHCO₃ aqueous solution than in NaOH solution. The InTaO₄ catalyst with 1 wt% Co₃O₄ cocatalyst had the highest activity among all catalysts. Co₃O₄ was incorporate into the surface structure of InTaO₄ to form Co_xInTaO_4-x. It resulted in more defect sites on the surface of InTaO₄ and changed the valence band structure. It formed a Schottky barrier to suppress the electron-hole recombination.

KEYWORDS

Carbon Dioxide, Utilization, Photoreduction, Methanol Formation, Visible Light Irradiation

Share and Cite:

Pan, P. , Chen, Y. , Brichkov, A. and Kozik, V. (2019) Effects of Co3O4 Cocatalyst on InTaO4 for Photocatalytic Reduction of CO2 to CH3OH under Visible Light Irradiation. Modern Research in Catalysis, 8, 39-49. doi: 10.4236/mrc.2019.84004.

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