Patent ID: 9700836
Date: 2017-07-11
CPC Classifications: B01D,C25B,F01N,Y02T

Claim:
1. An electrochemical double-cell plate purifying a lean-burn exhaust stream, containing sulfur oxides or nitrogen oxides, from a combustion process, the electrochemical double-cell plate comprises: a substrate made of a metal or an alloy, having a reducing capability, and including an outer surface, wherein the outer surface has a top surface, a bottom surface opposite the top surface, and a side surface joined with the top surface and the bottom surface; a solid-oxide layer covering the top surface and the bottom surface and having a first dense structure; and a cathode layer covering the solid-oxide layer, made of a porous material, contacting the lean-burn exhaust, and having an oxidizing environment, wherein the oxidizing environment and the reducing capability generate an electromotive force between the substrate and the cathode layer and make the cathode layer have a first reactive side and a second reactive side respectively corresponding to the top surface and the bottom surface of the substrate, and wherein the electromotive force promotes sulfur oxides and nitrogen oxides of the lean-burn exhaust to undertake decomposition reactions on the first reactive side and the second reactive side to generate sulfur vapor, oxygen and nitrogen.