Communication—Perovskite Electrochemical System for Highly Selective NOx Reduction of Diesel Engine Exhaust

Jing Shao,Ying Liu,Kent Kammer Hansen,Youkun Tao,Wenjing Zhang,Qilun Cheng

doi:10.1149/2.0261810jes

Abstract

A perovskite electrochemical system was developed for selective NOx reduction of diesel engine exhaust. The system was composed of a La0.9Sr0.1CoO3±δ oxidation catalyst and a (La0.85Sr0.15)0.95MnO3±δ/Ce0.9Gd0.1O1.95 electrochemical cell with BaO nanopariticles. A selectivity of 25–35% was achieved with a NOx conversion of 65–75% in 1000 ppm NO with 8% O2 at 375°C. The superior performance of the system was suggested to be ascribed to the promotion in NO2 formation substantially activating the NOx trapping and reduction processes on the electrode.

Highlights

Journal ofGeneral rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights
A perovskite electrochemical DeNOx system was developed by combining a La0.9Sr0.1CoO3±δ oxidation catalyst and a BaO infiltrated (La0.85Sr0.15)0.95MnO3±δ/Ce0.9Gd0.1O1.95 electrochemical cell
Selective NOx reduction under oxygen rich conditions was realized on this electrochemical system, which simultaneously eliminated the use of precious metals and the addition of reducing agents

Summary

Journal of

General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Nitrogen oxides (NOx, NO+ NO2) are dangerous for both human beings and the enviroment, causing health problems, acid rain and photochemical smog.[1] The NOx removal technology is in high demand, especially in the case of diesel engine exhaust, where excessive oxygen (5∼15%) making the reduction of NOx (200∼1500 ppm) extremely difficult. The mature technologies for NOx removal under oxygen-rich conditions require a reducing agent, either from extra fuel or supply of urea/ammonia, which greatly added the system complexity and raised concerns on spill management and secondary pollution.[2]

One attractive technology under development is electrochemical

Experimental or Theoretical

Results and Discussion

Summary