Method for fabricating exhaust gas decontamination reactor

Abstract

A method for fabricating an exhaust gas decontamination reactor, which is an exhaust gas decontamination pipe or a exhaust gas decontamination honeycombed structure, comprises steps: respectively coating a cathode layer and an anode layer on an outer wall surface and an inner wall surface of a pipe; and forming an enclosed reducing environment inside an internal channel of the pipe. The method for fabricating an exhaust gas decontamination honeycombed structure comprises steps: respectively coating cathode layers and anode layers on first inner wall surfaces of first passages and second inner wall surfaces of second passages; and forming enclosed reducing environments inside the second passages. Then, the cathode layers function as reaction sites to decontaminate exhaust gas. The present invention needn't arrange a reducing-gas system in the reactor and thus can decrease the volume and fabrication cost thereof.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an electrochemical-catalytic converter, particularly to a method for fabricating an exhaust gas decontamination pipe and an exhaust gas decontamination honeycombed structure.BACKGROUND OF THE INVENTION[0002]Fresh and clean air is essential for human health. Science and technology has promoted economical development. However, exhaust gas of vehicles and factories, especially motor vehicles and heavy industry factories, seriously pollutes the air.[0003]The emission standard of motor vehicles has been advanced persistently. However, the continuously increasing motor vehicles still bring about more and more serious air pollution. In a motor vehicle, the engine thereof burns fuel and converts chemical energy into mechanical energy. The burning process of fuel generates exhaust gases, including oxynitrides, carbon monoxide (CO), hydrocarbons (HC), and particulate matters, smoke, non-methane hydrocarbons (NMHC), and methane (CH4)...

AI Technical Summary

Benefits of technology

The present invention solves the problem of conventional electrochemical-catalytic converters requiring additional reducing-gas systems for generating electromotive force, which leads to higher fabrication costs, increased likelihood of damage, and difficulty in decreasing volume. The exhaust gas decontamination pipe and honeycombed structure fabricated according to the present invention can decontaminate exhaust gas without using any additional reducing-gas system, reducing fabrication costs and likelihood of damage. It can also be placed inside the exhaust pipe of a vehicle engine to decontaminate harmful matters generated by oxygen-enriched combustion and reduce air pollution.

Problems solved by technology

However, exhaust gas of vehicles and factories, especially motor vehicles and heavy industry factories, seriously pollutes the air.

However, the continuously increasing motor vehicles still bring about more and more serious air pollution.

The burning process of fuel generates exhaust gases, including oxynitrides, carbon monoxide (CO), hydrocarbons (HC), and particulate matters, smoke, non-methane hydrocarbons (NMHC), and methane (CH4), which would form photochemical smog, deplete ozone, enhance the greenhouse effect, cause acid rain, damage the ecological environment and endanger human health.

Therefore, too high a concentration of carbon monoxide would degrade the capability of hemoglobin to transport oxygen.

Oxynitrides are also likely to combine with hemoglobin and would impair the breathing and circulating functions.

In the conventional exhaust gas emission control technology of oxygen-enriched combustion, none single device or converter can perform conversion of oxynitrides (NOx), carbon monoxide (CO) and hydrocarbons (HCs) simultaneously.

However, ammonia gas is poisonous, hard to store and likely to leak.

Further, incomplete reaction of ammonia will cause secondary pollution.

Furthermore, the SCR system is bulky and has to cooperate with precision sensors.

However, the prior-art device must be operated in an encapsulated chamber and needs an electric source to power an electrochemical cell.

Therefore, the prior-art device consumes more power but cannot eliminate other harmful gases simultaneously.

However, the abovementioned “Electrochemical-Catalytic Converter” needs a reducing-gas system to generate electromotive force, which increases the fabrication cost.

Further, the unit for heating the circulating reducing gas will expand and contract, which is likely to damage the structure of the anode.

“Electrochemical-Catalytic Converter” is hard to fabricate into a compact structure for vehicle application.

Therefore, the prior art still has room to improve.

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