| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Outline of Final Research Achievements |
Various supported bimetallic catalysts were investigated for the reduction of nitrate using formic acid as the reductant to eliminate high concentrations of nitrate (several hundred ppm or more) in wastewater. In a comparison of various metal species, Pd-In exhibited high catalytic activity for nitrate reduction with low selectivity for ammonium ions. High activity and high selectivity for dinitrogen were obtained when In/Pd ratio was relatively low (0.2) or when Pd was loaded in a highly dispersed state on support. Decomposition rate greatly decreased when sulfate ions and the like coexisted in the reaction solution. However, decrease of decomposition rate was suppressed when nitrate ion adsorbent was used as a support. For practical use, molded catalysts were prepared and evaluated by a fluidized bed apparatus, demonstrating that nitrate could be decomposed and removed satisfactorily.
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