JPS6293420A - Solution of catalyst - Google Patents

Abstract

PURPOSE:To effectively lower the ignition temperature of a combustible particle and also to prevent the growth of rust in an exhaust system by supplying an exhaust gas purifier with a solution of catalyst which is obtained by way of adding a surface active agent to an aqueous solution of organic acid chloride. CONSTITUTION:On the upper stream side of an exhaust passage 16 above its part, where an exhaust gas purifying filter 18 is placed, is provided an injector 34, to which a solution of catalyst is supplied from a storing tank 30 by means of a pump 32. Said solution of catalyst, which is obtained by way of adding a surface active agent to the aqueous solution of organic acid chloride, does not produce hydrochloride acid which is corrosive to metallic members making up an exhaust system even if carbon, hydrogen and oxygen, which are the principal component or organic acid chloride, are caused to burn with the exhaust gas temperatures, and accordingly, the growth of rust can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a catalyst solution used for combustion treatment of combustible particulates such as carbon contained in exhaust gas from automobile diesel engines and the like.

(Prior art) Conventionally, for example, in a diesel engine for an automobile, an exhaust gas purification device is disposed in the exhaust passage in order to purify the exhaust gas discharged to the outside. M fuel particles are collected by an exhaust gas purification device and removed from the fJl gas. In this way, the process of collecting and removing iiJ combustible particulates contained in engine exhaust gas is
As shown in Japanese Patent Laid-open No. 56-98519, for example, as shown in Japanese Patent Application Laid-Open No. 56-98519, combustible i particles are collected in the (11) air 1111 path of the engine. In addition to arranging the iJ+ gas purification filter, a supply means for supplying auxiliary fuel such as liquid fuel) Vtaba gas fuel is installed upstream of this exhaust gas purification filter, and by burning the auxiliary fuel, the exhaust gas is reduced. The temperature of the gas is lower than 1Ak degrees [-
It is known that the exhaust gas purifying filter is heated to a high temperature to remove combustible particulates collected by the exhaust gas purifying filter without burning them.

However, when such an exhaust gas purification device is adopted,
When the engine is operated in the normal operating range where the exhaust gas temperature is relatively low, even if the auxiliary fuel is burned, the tJ + gas temperature will not be equal to tJ + gas temperature, and therefore the exhaust gas purification filter Combustible P from car phones etc. collected by
1 particulate burns sufficiently! There is a risk that L1 may become clogged in the exhaust gas purifying filter. When the exhaust gas purification filter becomes clogged, the back pressure in the exhaust passage increases by -1, causing the engine's normal j4! Rolling will be hindered.

Therefore, a catalyst solution that lowers the ignition temperature of the flammable particulates in the exhaust gas purification filter is supplied to the −[− flow side of the exhaust gas purification filter, and the An exhaust gas purification system has been proposed in which a catalyst is applied to i+J flammable particulates to promote their combustion.

The catalyst used in such an exhaust gas purification device is one that can effectively lower the ignition temperature of flammable particulates such as carbon, and that is water-soluble and has excellent solubility or dispersibility. lf
From this point of view, an inorganic acid salt such as an inorganic acid copper is used as the catalyst and 1-7.

(Problems to be Solved by the Invention) However, as mentioned above, an inorganic acid salt of an inorganic acid IM# is used as a catalyst to promote the combustion of combustible particulates such as carbon in an exhaust gas purification device. C) Exhaust! There are six bleed gas purification facilities in one road. On the odd side, is there a solution to the inorganic acid salt? If 61' is supplied as a 6'Jl volume liquid, there is a problem that rust may occur in the iJ gas system on the lower flow side from the part where the catalyst solution is supplied. Such 77+ Rust formation in air system/
-↓゛For example, hydrochloric acid containing chlorine contained in an aqueous copper solution, which is used as a catalyst solution, and hydrochloric acid having a chlorine content, which constitutes the exhaust system. This is due to the fact that when metal parts react with each other, for example, chlorides are formed, and when the metal parts react with each other, oxides of the metal parts constituting the exhaust system are formed. reactor.

In view of the above, the present invention is directed to promoting the combustion of extremely flammable tri-i'- such as carbon, which is disposed in the exhaust passage of the engine. It is used to effectively lower the ignition temperature of the l-1 (flammable iζI element by 1. The purpose of this book is to provide a catalyst solution that does not require the use of a catalytic solution. The catalyst solution according to the invention is used to promote the combustion of combustible particles in an exhaust gas purification device attached to an engine, and is an organic acid aqueous solution containing a surfactant. The organic acid salt aqueous solution may be, for example, a copper formate aqueous solution or a copper acetate aqueous solution.
As a surfactant, it may adversely affect the catalytic action of organic acid salts.
For example, a nonionic surfactant or a water-soluble P1 al':I group is used.

(Function) When a catalyst solution in which a surfactant is added to the organic acid salt aqueous solution according to the present invention as described above is used, carbon is the main component of the organic acid salt.

hydrogen. Oxygen is combusted based on the exhaust gas temperature and becomes harmless components such as carbon dioxide gas, hydrogen gas, and water, and hydrochloric acid, etc., which is corrosive to the metal components that make up the exhaust system, is not generated. As a result, the occurrence of rust in the air system is avoided. Furthermore, due to the action of the surfactant 171' agent, the compatibility between the aqueous solution of the legated acid salt and iI (flammability '4ξ'1'l'1.L-') is significantly improved. Combustion of the iiJi particles is sufficiently promoted without causing rust to occur in the system.

(Example) Prior to describing the examples, an example of an exhaust gas purification device to which the catalyst solution according to the present invention is applied will be described.

FIG. 1 shows an example of an exhaust gas purification device using the catalyst solution according to the present invention, and an automobile diesel engine to which the catalyst solution is applied.
Shown with Zell engine.

In a four-cylinder diesel engine equipped with this exhaust gas purification device, each combustion chamber 14 of the engine body 1 (l) is supplied with intake air through an intake road 12.
C. Fuel and air explode and burn, resulting in 5
1) 1 gas passes through the exhaust passage 16; m
Please send an external Q. , -1 discharged to the outside
In order to purify the 1F gas, the exhaust passage lfil:2 filter 18 for purifying exhaust gas is inserted.

1) 1-Air scum purification filter' l 8 iI1, -
L + 1 i′ = χ ”) () etc. 1; porous s) Mi 2) made of cable material; The carrier 20 shown in FIGS.
As shown in the figure, a large number of passages 22 serving as exhaust gas flow paths are arranged in parallel and partitioned by partition walls 24 in the axial direction, and each passage 22 has one of its two ends. is closed by a closing member 26, and the other end is an open end.
They are not combined on one end surface of the carrier 20, but are appropriately dispersed on both end surfaces of the carrier 20. In order to improve the ability of the inner wall of the passage 22 formed inside the carrier 20 to trap flammable particulates such as carbon contained in the exhaust gas, As shown in FIG. 3, a Nara mink coating layer 28 made of alumina, silica, etc. is formed.

In the exhaust gas purifying filter 18 having such a configuration, the exhaust gas flowing into the exhaust iJT circuit 16 (the end on the JF oil side is an open end and the passage portion 22 of the l1 body 20 , as shown by "C arrow ■ P" in Figure 3,
The water passes through a large number of pores in the partition wall 24 of the 111 body 20, and flows into the adjacent passage 22 whose downstream end, which is connected to the exhaust passage 16, is an open end. 7. It flows out from the upstream end face of the JjJ body 20 that meets the exhaust passage 1fi. In this way, when the exhaust gas passes through the li suspension body 0, at the partition wall 24, the combustible particles such as G and carbon contained in the exhaust gas are collected and collected. The combustible M fine particles are instantly burned and burned.

In addition, the catalyst solution supplied from the storage tank 30 by the pump 32 is supplied to the part of the exhaust passage 1 upstream of the part where the exhaust gas purification filter 18 is disposed. Internal, - injection) 1, 1, injector 3
4:18 The catalyst solution is applied to the partition wall 2 of the exhaust gas purifying filter 18 (111 body 20).
Combustibility of carbon etc. collected in 4
In order to promote the combustion of the exhaust gas, for example, if the exhaust gas temperature is low, the temperature of the exhaust gas may be low.
When the height of the steamer becomes high, etc., an exhaust passage is necessary (1, 2, 2, etc.).

So C7, Jli or il! 1 Ventilation 160) The catalyst solution according to the present invention is used as the catalyst solution for promoting the combustion of combustible fine particles such as carbon, which is introduced into the JF gas purification filter 18.

The catalyst solution according to the present invention is made by adding a surfactant to an aqueous solution of an organic acid salt. It is said that

[Example I]

For every 1 e of water, 1 to 1 acetylacetate] and copper [Cu
(CH:l C0CT(COCHa)2) 50
g, and further added and dispersed polyethylene oxide phenyl ether]Og as a surfactant. -------------Catalyst solution A [Example ■] 2 parts copper formate C (CHCO2), Cu) 1 part water
00g was dissolved and further 10g of polyethylene oxylide phenyl ether as a surfactant was added and dispersed. -----Catalyst solution B [Example ■] Copper formate ((CLICOz)2Cu) 1 to 1N of water
Dissolve 00 g of 2, and then add 10 cc of surfactant and C2 of propyl acetate. A certain catalyst solution A
, to confirm the effects of B and C, the following? , Catalyst solution #D was prepared as a comparative sample of this j4 (Belnyo), and a comparative experiment was conducted.

Catalyst solution I-]...Water 17! In contrast, 100 g of cupric chloride (CuC7!2), an inorganic acid salt, was dissolved.

In this experiment, a diesel engine (exhaust ≠ 2000 cc) as shown in FIG. Purification filter 1
Each of the ten catalyst solutions A to D is injected from the injector 34 to the part of the 11th flow example from the part where 8 is arranged, and the exhaust gas θ in the collected exhaust gas is
) '+iJ combustion start temperature and exhaust gas 1)
The back pressure return rate of the exhaust system was measured, and the occurrence of rust in the exhaust system was also inspected. The diesel engine was operated at an engine speed of 3000 rpm and an average effective pressure of 3 kg/(Jll), and the combustion start temperature and back pressure return rate were changed 10 times for each of the catalyst solutions A to D. 1 of each catalyst solution was measured.
The injection amount per injection was 10cc.

As a result, when B and C are used in the catalyst solution according to the present invention, approximately the same measured values as when catalyst solution I) is used regarding the combustion start temperature and back pressure return rate are obtained. In addition, when a catalyst solution is used, after measuring the combustion start temperature and back pressure return rate 10 times, the storage container of the exhaust gas purification filter 18 and the indicator 34 of the exhaust passage 16 are removed. Although rust was observed in the surrounding areas, when catalyst solutions A, B, and C were used,
No rust was observed in any part.

(Effects of the Invention) As is clear from the above description, the catalyst solution according to the present invention can be used to promote the combustion of combustible particulates such as carbon that fall into the exhaust gas purification device disposed in the exhaust passage of the engine. When used as a fuel, the ignition temperature of combustible particulates in the exhaust gas purification device can be effectively lowered to sufficiently burn the combustible particulates without causing rust in the exhaust system. Therefore, it is possible to prevent clogging of the exhaust gas purification filter provided in the exhaust gas purification device without adversely affecting the life of the exhaust system.
Preventing situations where the back pressure in the exhaust passage becomes excessive 1.
You can watch it.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an example of an exhaust gas purification device to which the catalyst solution according to the present invention is applied, together with a diesel engine in which it is installed, and FIGS. 2 and 3 are diagrams showing the exhaust gas shown in FIG. It is a perspective view and a partial sectional view of a filter for gas purification.

Claims (1)

[Claims] 1. A catalyst solution used to promote combustion of combustible particulates in an exhaust gas purification device attached to an engine, and characterized in that it is made by adding a surfactant to an organic acid salt aqueous solution.