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http://dx.doi.org/10.5369/JSST.2010.19.3.176

Characteristic comparison of sensing materials in mixed potential type NH3 gas sensors for urea-SCR DeNOx system in diesel engine  

Choi, An-Gi (Department of Materials Science & Engineering, KAIST)
Yang, Young-Chang (Department of Materials Science & Engineering, KAIST)
Koo, Bon-Chul (Department of Materials Science & Engineering, KAIST)
Park, C.O. (Department of Materials Science & Engineering, KAIST)
Publication Information
Journal of Sensor Science and Technology / v.19, no.3, 2010 , pp. 176-183 More about this Journal
Abstract
It is considered that the urea injection DeNOx SCR(selective catalytic reduction) system is the only promising method to satisfy the worldwide NOx emission standards. As for the theoretical aspect, reactants of NO and $NO_2$ with $NH_3$ produce $H_2O$, $N_2$ and $O_2$ which do not harm human beings and environmental as well. The realization of maximum NOx conversion (without using a post oxidation catalyst) is only possible with closed loop controlled urea dosing. It means built-in $NH_3$ gas sensor have to be developed for detecting accurate $NH_3$ concentration for the feedback system. Using YSZ(yttria-stabilized zirconia) as a solid state electrolyte and $In_2O_3$ as a sensing material, this paper aims to study dependable $NH_3$ gas sensor for the promising solution of DeNOx technology, which have a reproducible electric output signal, a high sensitivity and fast response.
Keywords
$NH_3$ gas sensor; solid state electrolyte; YSZ; $In_2O_3$;
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