Abstract
Comparison of NaNbO3 and NaTaO3 as the photocatalysts in the reaction of hydrogen generation The photocatalytic production of hydrogen over several chemical compounds based on sodium niobates and tantalates has been investigated. The photocatalysts have been prepared by an impregnation method of Nb2O5 and Ta2O5 in the aqueous solution of sodium hydroxide and then the calcination at the temperature range of 450 - 800°C. In this report, we present the study showing that of the catalysts explored, the highest photocatalytic activity was shown in a sample obtained at the temperature of 450°C and containing NaTaO3 as a main phase.
Highlights
Many studies have been performed to develop heterogeneous photocatalysis for water splitting into hydrogen and oxygen[1,2,3]
The efficiency of photocatalytic hydrogen evolution is relatively low and many photocatalysts will deactivate after a long-term irradiation
A development of highly efficient photocatalysts becomes a hot topic in the field of photocatalysis
Summary
Many studies have been performed to develop heterogeneous photocatalysis for water splitting into hydrogen and oxygen[1,2,3]. Both of those materials can be candidates as photocatalysts for the reaction of photocatalytic hydrogen generation. NaNbO3 and NaTaO3 have been synthesized via solid state reaction of alkali metal carbonates and Nb2O5/Ta2O5 and the temperature of 800°C or above, which sometimes leads to inhomogenity in composition and coarse particles. The efficiency of NaNbO3 and NaTaO3 used as catalysts in the photocatalytic hydrogen generation will be presented. In the first step of the photocatalyst preparation, Nb2O5 or Ta2O5 were impregnated in the aqueous solution of sodium hydroxide. The photocatalysts prepared in the abovementioned way are labeled in the following manner: Na/ Nb2O5-T and Na/Ta2O5-T (T means the temperature of calcination). The activities of the obtained catalysts for the photocatalytic reactions of hydrogen generation were carried out in a close system with an inner-irradiation-type reactor. The amount of evolved hydrogen was determined by using a gas chromatograph (The Thermal Conductivity Detector (TCD), Ar as a gas carrier)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
