ELECTROCHEMICAL DECOMPOSITION OF NOX AND OXIDATION OF HC EMISSIONS BY DEVELOPING ELECTROCHEMICAL CELLS FOR DIESEL ENGINE EMISSION CONTROL

Paper #:
  • 2018-01-0332

Published:
  • 2018-04-03
Abstract:
Diesel engines are the most widely used power source in the field of Automobiles and stationary power generation. The main drawback in using diesel engines are it liberates an excess amount of NOx and PM emissions in the exhaust. NOx emission causes serious effect on the environment and it has to be controlled effectively. The SCR is the most widely used after treatment technology to control NOx emission but it has various disadvantages. SCR is also not suitable for light commercial vehicles because of the requirement of larger space. In this study, electrochemical decomposition of NOx is proposed for the control of NOx emission in diesel engine. In this work, a ceramic electrochemical cell consisting of YSZ substrate plates as electrolyte and Ag-YSZ and NiO-YSZ coating has given as an electrode material. The NOx decomposition in an electrochemical cell is achieved by passing electric current. The electrochemical cells are tested for emission reduction in diesel exhaust. All the experiments were conducted in a single cylinder diesel engine. The power consumption for the electrochemical cell was less. 2V supply of power in all load conditions was effective in the operation of electrochemical cells. It is observed that the electrochemical cell has high NOx decomposition rate of 80% at the exhaust temperature 350-400°C.The HC reduction up to 65% was observed with this technique. The electrochemical NOx reduction is a simple technique with reduced complexity. From the experiment, it is observed that this concept works efficiently in the oxygen rich diesel exhaust
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