کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6474819 | 1424965 | 2017 | 9 صفحه PDF | دانلود رایگان |
- The stoichiometry of Fe(II)EDTA-NO reduction by Zn powder was obtained.
- Fe(II)EDTA-NO reduction by Zn powder was a pseudo-second-order reaction with respect to Fe(II)EDTA-NO.
- This is first time that simultaneous reduction of Fe(III)EDTA and Fe(II)EDTA-NO with Zn powder was investigated.
Regeneration of Fe(II)EDTA, converting Fe(III)-EDTA and Fe(II)EDTA-NO to Fe(II)EDTA, is the key process in a wet flue gas denitrification technology with Fe(II)EDTA solution. In this paper, Zn powder was first employed as a reductant to reduce Fe(II)EDTA-NO. The stoichiometry and kinetics of Fe(II)EDTA-NO reduction by Zn powder were investigated with respect to Zn powder concentration, pH value, and temperature. The effect of the particle size of the Zn powder on Fe(II)EDTA-NO reduction was also investigated. The experimental results indicated that Fe(II)EDTA-NO reduction rate increased with the decrease of pH value and elevated temperature, and small particle size is beneficial to Fe(II)EDTA NO reduction. Fe(II)EDTA-NO reduction with Zn powder showed a pseudo-second-order reaction concerning Fe(II)EDTA-NO. In addition, the energy of activation (Ea) and the entropy of activation (ÎSâ¡) of the Fe(II)EDTA-NO reduction with Zn powder were estimated to be 19.853Â kJÂ molâ1 and â135.557Â JÂ Kâ1Â molâ1, respectively. Finally, the simultaneous reduction of Fe(III)EDTA and Fe(II)EDTA-NO with Zn powder was investigated. Results showed that Zn powder had better performance on simultaneous Fe(III)EDTA and Fe(II)EDTA-NO reduction as compared to the earlier related research. These fundamental researches can offer valuable guidance for industrial denitrification using mixed Fe(II)EDTA and Zn powder system.
Journal: Fuel - Volume 199, 1 July 2017, Pages 523-531