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Cng ngh iu khin nhim khng kh Nht BnExhaust Gas Treatment EquipmentX Thit b x l kh

Updated: November 1996Cp nht: Thng 11 nm 1996

An Organic Halogen-Gas Purification System:Mt Halogen khhu c sch h thng:The "HALOCAT" Catalytic-Incineration Exhaust-GasTreatment ApparatusHALOCAT "xc tc-Thiu hy thi khiu tr Thit b

1.1.IntroductionGii thiu

This exhaust gas treatment system provides the effective purification of the organic exhaust gascontaining halogenated organic compounds by employing catalysts of Nippon Shokubai's owndeveloped (STH-catalyst). H thng x l kh thi ny cung cp cho lc hiu qu ca kh thihu c c cha cc dn xut halogen ha cc hp cht hu c bng cch s dng cht xc tcca Nippon Shokubai pht trin (STH-cht xc tc).Organic exhaust gas containing halogenated organic compounds can be decomposed by catalyticincineration and is converted into CO 2 , H 2 O and hydrogen halogenide. Hu c kh thi ccha cc dn xut halogen ha cc hp cht hu c c th c phn hy bng cch t chyxc tc v c chuyn i thnh CO 2, H 2 O v hydro halogenide.Then the hydrogen halogenide is neutralized by alkalied solution in the scrubber. Sau ,

halogenide hydro c trung ho bi gii php alkalied trong nhng my ch sn.Therefore the above-mentioned exhaust gas can be purified without generating hazardousexhaust gas and waste water. V vy, kh thi ni trn c th c tinh khit m khng to ra khthi c hi v nc thi.

2.Outline of this systemPhc tho ca h thng ny

3.3.Excellent feature of this systemTnh nng tuyt vi ca h thng ny

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1) Organic exhaust gas even containing halogenated organic compounds can beconverted 1) hu c kh thi thm ch c cha cc dn xut halogen ha cchp cht hu c c th c chuyn i

effectively into harmless substance. hiu qu vo cht v hi.2) Low running cost. 2) chi ph hot ng thp.3) Purification of various kinds of halogenated organic compounds at lowtemperature. 3) sch cc loi khc nhau ca cc dn xut halogen ha cc hp

cht hu c nhit thp.4) No hazardous waste water is generated. 4) Khng c nc thi nguy hi cto ra.5) No hazardous by-product such as CO and halogen gas is generated. 5) Khngc nguy him do sn phm nh CO v kh halogen c to ra.6) As the catalyst is a honeycomb form, the pressure drop thereof is low. 6)Khi cht xc tc l mt hnh thc t ong, gim p lc ca chng l thp.7) A catalyst to be used keeps its stable effect for a long span of life-time. 7) Mt cht xc tc c s dng gi n nh hiu lc ca n cho mtkhong thi gian di ca thi gian cuc sng.8) Easy operation(can be operated with an automatic control requiring nomanpower) 8) d dng hot ng (c th c vn hnh vi mt iu khin tng khng cn ngun nhn lc)

and easy maintenance. v bo tr d dng.4.4.Purification efficiency of chlorinated organic compoundsThanh lc hiu qu ca cchp cht clo hu c

Panasonic Begins Shipping Samples of New Catalyst forDiesel Exhaust Gas Purification

Panasonic will reduce the cost and energy consumption of diesel exhaust gas treatmentequipment with the newly developed alkali metal compound.

Panasonic Corporation announced today it has succeeded in the development of a new catalystusing an alkali metal compound to decompose and purify particulate matter in diesel engineexhaust gas[1], and has begun shipping its samples this month. As diesel emission regulationshave become increasingly stringent, particularly in Japan, the US, and Europe, there are highexpectations for this new catalyst as it presents a low-cost and energy-saving solution for diesel-powered vehicles.

This new alkali metal-based catalyst developed by Panasonic Ecology Systems Co. Ltd., a

subsidiary of Panasonic Corporation, accelerates the oxidation of particulate matter and directlydecomposes them without using platinum. It provides the same level of combustion performanceas a conventional platinum-based catalyst but at a lower temperature (approximately 20% lower,in-house experiment). This means less energy is required to maintain the optimum temperaturefor catalytic reactions, thereby reducing CO2 emissions and contributing to energy conservation.When used at the same temperature required for the conventional platinum-based catalyst, thisnew catalyst even increases the combustion speed.

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In comparison, the current mainstream diesel exhaust treatment equipment uses platinum as thepurification catalyst, making its costs more expensive and susceptible to price fluctuations. Inaddition, conventional equipment consumes fuel in order to maintain the temperature forcatalytic reaction at an optimum level during particulate treatment, reducing the overall effect ofthe equipment.

Standard diesel exhaust gas treatment equipment consists of a diesel oxidation converter(DOC)[2], which removes hydrocarbons (HC) and carbon monoxide (CO), and a catalyst-coateddiesel particulate filter (DPF)[3] , which removes particulate matter. With a conventional catalyst,the DOC itself also requires platinum to produce nitrogen dioxide (NO2), as the conventionalcatalyst cannot decompose particulate matter without the oxidation action of NO2. However,since the newly developed catalyst can directly decompose particulate matter without usingNO2, the amount of platinum used in the DOC can also be significantly reduced, therebyreducing the total cost of the equipment.

In addition to using a new metal compound in the catalyst, Panasonic has devised a new catalyst

coating technology to maximize the performance of the catalyst on a variety of DPF types(cordierite[4], SiC[5], metal, etc.). A new additive was also developed to solve the durability issueassociated with a catalyst using alkali metal, making this new technology possible. Panasoniccurrently has 84 patents in Japan and 7 patents overseas, including pending applications.

[Fig. 1] Principle of particulate matter (PM) combustion by the catalyst-coated DPF

Details of the features

Combust particulate matter without using platinum

The new catalyst is based on an alkali metal compound which produces active species of alkali metal in the reactiontemperature range. The active species accelerate oxidation of particulate matter [mainly made of carbon (C)] anddecompose them into CO2 (Fig. 1). Unlike the conventional type of catalyst, the new catalyst does not use platinum.

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[Fig. 2] Changes in the catalyst-coated DPFtreatment speed with temperature

Combust particulate matter at a low temperature

The new catalyst based on the alkali metal compound provides the same level of combustion performance as aconventional platinum-based catalyst at a lower temperature (Fig. 2). Therefore, the temperature of diesel exhaustgas treatment equipment can be lowered, reducing the amount of fuel used for maintaining the temperature andenhancing the energy efficiency of the equipment.

[Fig. 3] Structure of diesel exhaust gas treatment equipment

Reducing costs of diesel exhaust gas treatment equipment

Diesel exhaust gas treatment equipment consists of a DOC[2], which removes hydrocarbons (HC) and carbonmonoxide (CO), and a catalyst-coated DPF[3], which removes particulate matter. With a conventional catalyst, the

DOC needs platinum to produce nitrogen dioxide (NO2). Since the new catalyst can directly decompose particulatematter without using NO2, the amount of platinum used in the DOC can be significantly reduced, thereby reducingthe total cost of the equipment.

Glossary[1] Particulate matter in diesel engine exhaust gas - Fine substances based on carbon (C) contained in the exhaust

gas from diesel engines. They are a major component of the black exhaust gas produced by diesel engines andpollute the air. Therefore, removal of particulate matter is required by regulations.[2] DOC (Diesel Oxidation Converter) - One of the components of diesel exhaust gas treatment equipment. Its

function is to decompose the hydrocarbons (HC) and carbon monoxide (CO) contained in diesel engine exhaust gas.

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When used in combination with a conventional platinum-based catalyst-coated DPF, platinum needs to be added tothe DOC to produce NO2.[3] Catalyst-coated DPF(Diesel Particulate Filter) - One of the components of diesel exhaust gas treatmentequipment. Its function is to remove the particulate matter contained in diesel engine exhaust gas. DPFis made bycoating a base material with a catalyst.[4] Cordierite - One type of ceramic material used in catalyst to process engine exhaust gas. Its relative density islight and it excels in heat capacity.[5] SiC - One type of ceramic material used in catalyst to process engine exhaust gas. It excels in heat resistance.