Applicability of a catalytic reduction method using a palladium-copper catalyst and hydrazine for the denitration of a highly concentrated nitrate salt solution

作者：Kadowaki Haruhiko^*; Meguro Yoshihiro

来源：Journal of Nuclear Science and Technology, 2012, 49(9): 881-887.

DOI：10.1080/00223131.2012.712483

• denitration
• reduction
• nitrate
• hydrazine
• catalyst
• reaction rate

Denitration of a highly concentrated sodium nitrate (NaNO3) aqueous solution via a catalytic reduction method using a palladium-copper catalyst supported on carbon powder (Pd-Cu/C) and hydrazine (N2H4) was investigated. It was demonstrated that nitrate ion (NO3-) in a 5 mol L-1 NaNO3 solution was completely reduced through an intermediate nitrite ion (NO2-) to nitrogen compounds such as nitrogen, nitrous oxide, and ammonia. By comparing the reaction rates of NO3- and NO2- obtained using catalysts with various Pd-Cu compositions and different reductants (hydrogen (H-2) or N2H4), it was determined that the catalyst with a molar ratio of Pd:Cu = 1:0.66 provides the maximum reaction rates for NO3- and NO2- using N2H4, and that not only the reactions of NO3- and NO2- but also that of N2H4 were affected by the Pd-Cu composition.

• 出版日期2012-9