Methane formation over TiO2–based photocatalysts: reaction pathways

Anna Malankowska; Marek Klein; Adriana Zaleska-Medynska

Methane formation over TiO2–based photocatalysts: reaction pathways

Abstract

The effects of organic impurities adsorbed or incorporated into semiconductors structure on the photocatalytic products are noteworthy. For this purpose, the as-prepared Ag, Au and Pdmodified TiO2 samples were exposed to UV-vis irradiation in various gas atmospheres (CO2, N2, 600 ppm CO2 in N2, and 13CO2) in order to clarify the route of CH4 formation in the process of photocatalytic CO2 reduction. In the presented research it was shown that in N2 atmosphere the high concentration of methane was formed. For the removal of the organic adsorbates from photocatalysts the elongated calcination process was applied, however, it occurred insufficient for carbonless TiO2 preparation. The highest amount of methane was formed in the presence of the 0.5Ag-TiO2 sample which contained the highest amount of carbon. Experimental data, including isotope labelling results, confirmed that the obtained methane was formed from the organic impurities incorporated into TiO2 structure and not from the 13CO2.

Authors (3)

Anna Malankowska
Marek Klein
Adriana Zaleska-Medynska prof. dr hab. inż.

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: APPLIED CATALYSIS B-ENVIRONMENTAL no. 164, pages 433 - 442,
ISSN: 0926-3373
Language:: English
Publication year:: 2015
Bibliographic description:: Malankowska A., Klein M., Zaleska-Medynska A.: Methane formation over TiO2–based photocatalysts: reaction pathways// APPLIED CATALYSIS B-ENVIRONMENTAL. -Vol. 164, (2015), s.433-442
Verified by:: Gdańsk University of Technology