Nitrogen gas selectivity enhancement on nitrate denitrification using nanoscale zero-valent iron supported palladium/copper catalysts

作者：Lubphoo Yingyote; Chyan Jih Ming; Grisdanurak Nurak; Liao Chih Hsiang^*

来源：Journal of the Taiwan Institute of Chemical Engineers, 2015, 57: 143-153.

DOI：10.1016/j.jtice.2015.05.005

• Denitrification
• Catalytic nitrate reduction
• Nanoscale zero-valent iron
• Trimetal
• Nitrogen gas selectivity
• Pseudo-second-order reaction

Nanocomposite trimetals, (Cu-Pd)-nFe(0) and (Pd-Cu)-nFe(0), were used for enhancing both nitrogen gas selectivity and nitrate removal. The initial pH, temperature and initial nitrate concentration were investigated as variable parameters in this study. It was found that the trimetal (Pd-Cu)-nFe(0) (10% (Pd-Cu) loading and 2:1 (Pd:Cu) ratio) is promising under the conditions of 50 degrees C, pH 7 and 100 mg NO3-/L; its largest N-2 gas selectivity was 60.5%, and NO3- removal 90%. Based on the kinetic analysis, pseudo-second-order reaction was closely followed under the studied conditions. Higher nitrate removal rate was observed under acidic and high temperature conditions. The activation energy of nitrate reduction over the temperature range of 20-50 degrees C was 51.0 kJ mol(-1).

• 出版日期2015-12