Methane formation over TiO2–based photocatalysts: reaction pathways
PBN-AR
Instytucja
Wydział Chemiczny (Politechnika Gdańska)
Informacje podstawowe
Główny język publikacji
ENG
Czasopismo
APPLIED CATALYSIS B-ENVIRONMENTAL
ISSN
0926-3373
EISSN
Wydawca
DOI
URL
Rok publikacji
2015
Numer zeszytu
Strony od-do
433-442
Numer tomu
164
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
TIO2, CO2 PHOTOCONVERSION, CARBON 13C, REACTION MECHANISM
Streszczenia
Język
Treść
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.
Inne
System-identifier
128738