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Comparison of NaNbO3and NaTaO3as the photocatalysts in the reaction of hydrogen generation

100%
Zielińska B., Kaleńczuk R.
Polish Journal of Chemical Technology
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2010
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vol. 12
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issue 3
33-35
EN
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.
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Photocatalytic hydrogen generation over alkali niobates in the presence of organic compounds

81%
Zielińska B., Sreńscek-Nazzal J., Kaleńczuk R.
|
EN
The photocatalytic efficiency of alkali niobate-based compounds (Li, Na, K) for hydrogen generation has been investigated. The systematic study showed that the highest photocatalytic activity was observed in the case of Na/Nb2O5 catalyst which contained sodium niobate (NaNbO3) phase and that the most efficient electron donor for hydrogen generation was formic acid. In addition, the effect of organic donor (HCOOH) concentration on the amount of the evolved hydrogen was studied.
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