JPH07127457A - Method for controlling exhaust gas emission from internal combustion engine, such as diesel engine, by negative catalyst - Google Patents

Abstract

PURPOSE:To reduce an amount of a discharged toxic substance, such as nitrogen oxide, in exhaust gas from an internal combustion engine, such as a diesel engine. CONSTITUTION:A flake of platinum, molybdenum, and rhodium, being a negative catalyst is forced into pressure adhesion or welding to a portion, such as an inner wall of an internal combustion engine and a piston head, with which combustion gas makes contact or an alloy layer is formed on the surface thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This patent relates to a method for reducing nitrogen oxides in exhaust gas from an internal combustion engine.

[0002]

2. Description of the Related Art Conventional technology is a technology for treating exhaust gas after fuel is burned in an internal combustion engine. Taking a diesel engine as an example, if the intake air amount is reduced to reduce nitrogen oxides, particulate matter The amount of nitrogen oxides will increase, and the amount of intake air will increase, and the amount of nitrogen oxides will increase. There is still no definitive way to purify the exhaust of diesel engines.

[0003]

Diesel engine emits a large amount of nitrogen oxides, smoke, particulates and the like. Since the diesel engine is always used with excess air, it cannot effectively use the three-way catalyst to purify exhaust gas.

[0004]

[Means for Solving the Problems] Exhaust gas is fixed with a negative catalyst, platinum, molybdenum, vanadium, rhodium, etc., which inhibits the binding reaction of nitrogen and oxygen, such as a combustion chamber inner wall of an internal combustion engine, a piston head, or the like where combustion gas comes into contact. Reduces nitrogen oxides inside.

[0005]

The negative catalyst does not generate nitrogen oxides, so smoke, particulates, etc. are completely combusted with excess oxygen and exhaust gas is purified.

[0006]

EXAMPLE A thin piece of a negative catalyst, platinum, molybdenum, vanadium, rhodium, etc. is pressure-bonded, welded or an alloy layer is formed on the surface of a combustion chamber inner wall of an internal combustion engine, a portion such as a piston head, which comes into contact with combustion gas.

[0007]

Since the present invention is a new method of inhibiting the production of harmful substances such as nitrogen oxides by a negative catalyst at the time of fuel combustion, the presence of excess oxygen in the combustion chamber does not hinder the reduction of harmful substances. Oxygen that is no longer combined with nitrogen improves fuel efficiency by complete combustion of fuel and eliminates incomplete combustibles such as particulates. For gasoline cars,
It has a great effect on exhaust gas purification of lean gasoline engine.

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Claims (1)

[Claims] 1. An inner wall of a combustion chamber for reducing nitrogen oxide (NOx) generated by reaction of nitrogen (N) and oxygen (O ₂ ) in the air of a combustion chamber of an internal combustion engine under high temperature and high pressure. Negative catalyst that inhibits the bonding reaction of nitrogen and oxygen such as piston head, which inhibits the bonding reaction of nitrogen and oxygen, and platinum, molybdenum, vanadium, rhodium, etc. are fixed, and the generation of harmful substances such as nitrogen oxides in exhaust gas is negative catalyst. The method of trying to reduce at the time of combustion of fuel by the action of.