Electro-catalytic honeycomb for exhaust emissions control

摘要

An electro-catalytic honeycomb for controlling exhaust emissions, which adopts to purify a lean-burn exhaust, comprises a honeycomb structural body, a solid-oxide layer and a cathode layer. The honeycomb structural body includes an anode, a plurality of gas channels, and a shell. The anode is formed as a backbone, the gas channels are formed inside the backbone for passing the exhaust, and the shell covers an outer surface of the anode. The solid-oxide layer is adhered to an inner surface of the anode and connects the shell so as to encapsulate the anode. The cathode layer is adhered to a tube wall of the solid-oxide layer and has an oxidizing environment. The anode has a reducing environment. The reducing and the oxidizing environment facilitate an electromotive force to occur between the anode and the cathode layer to promote a decomposition of nitrogen oxides of the exhaust into nitrogen and oxygen.

主权项

1. An electro-catalytic honeycomb for controlling exhaust emissions, which adopts to purify a lean-burn exhaust, comprising:
a honeycomb structural body comprising an anode which is formed as a backbone of the honeycomb structural body, a plurality of gas channels formed inside the backbone for passing the lean-burn exhaust, and a shell covering an outer surface of the anode, the anode being made of a first porous material and having a reducing environment, and the shell being formed of a first dense structure; a solid-oxide layer adhering to an inner surface of the anode opposite to the outer surface and connecting the shell so as to encapsulate the anode completely, and the solid-oxide layer being formed of a second dense structure and having a tube wall facing the gas channels; and a cathode layer adhering to the tube wall which is made of a second porous material and has an oxidizing environment, and the solid-oxide layer being disposed between the anode and the cathode layer; wherein the reducing environment and the oxidizing environment facilitates an electromotive force to occur between the anode and the cathode layer to promote a decomposition of nitrogen oxides of the lean-burn exhaust into nitrogen and oxygen on the cathode layer.