KR100461125B1 - A catalyst of exhaust gas for compressed natural gas - Google Patents

A catalyst of exhaust gas for compressed natural gas Download PDF

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KR100461125B1
KR100461125B1 KR10-2002-0024832A KR20020024832A KR100461125B1 KR 100461125 B1 KR100461125 B1 KR 100461125B1 KR 20020024832 A KR20020024832 A KR 20020024832A KR 100461125 B1 KR100461125 B1 KR 100461125B1
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catalyst
exhaust gas
gas
cng
palladium
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KR10-2002-0024832A
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KR20030086710A (en
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인치범
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현대자동차주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2370/00—Selection of materials for exhaust purification
    • F01N2370/02—Selection of materials for exhaust purification used in catalytic reactors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

본 발명은 압축천연가스(compressed natural gas: CNG) 자동차 배기가스 정화용 촉매에 관한 것으로서 더욱 상세하게는 기존의 정화촉매와 동일한 양의 귀금속을 사용하되, 사용된 귀금속 활성물질의 배합비를 이상적으로 조절함으로써 CNG 자동차 배기가스의 대부분을 구성하며 정화가 까다로운 메탄을 효율적으로 정화할 수 있는 개선된 압축천연가스 자동차 배기가스 정화용 촉매에 관한 것이다.The present invention relates to a catalyst for purifying compressed natural gas (CNG) automobile exhaust gas, and more particularly, by using the same amount of precious metal as a conventional purification catalyst, by ideally adjusting the mixing ratio of the used precious metal active material. An improved compressed natural gas automobile exhaust gas purification catalyst that makes up most of the CNG vehicle exhaust gas and can efficiently purify methane which is difficult to purify.

Description

압축천연가스 자동차 배기가스 정화용 촉매{A catalyst of exhaust gas for compressed natural gas}A catalyst of exhaust gas for compressed natural gas

본 발명은 압축천연가스(compressed natural gas: 이하 "CNG"라고 표기) 자동차 배기가스 정화용 촉매에 관한 것으로서 더욱 상세하게는 CNG자동차 배기가스의 대부분을 구성하며 정화가 까다로운 메탄을 기존의 정화촉매와 동일한 양의 귀금속을 사용하면서도 효율적으로 정화할 수 있는 개선된 CNG 자동차 배기가스 정화용 촉매에 관한 것이다.The present invention relates to a catalyst for the purification of compressed natural gas (hereinafter referred to as "CNG") automobile exhaust gas, and more particularly, it constitutes the majority of the exhaust gas of CNG automobile and methane, which is difficult to purify, is the same as a conventional purification catalyst. An improved catalyst for the purification of CNG automotive exhaust gas that can be efficiently purified while using a large amount of precious metals.

CNG(Compressed Natural Gas ; 압축천연가스)는 넓게는 천연으로 지중에서 산출하는 가스를 말하지만, 보통 탄화수소를 주성분으로 하는 가연성가스를 가리킨다. CNG의 종류로는 유전지대에서 나오는 유전가스, 탄전지대에서 나오는 탄전가스, 석유나 석탄의 성인과는 관계없이 물에 녹아 존재하는 수용성가스로 대별된다. 탄전가스, 수용성가스는 메탄을 주성분으로 하고, 이산화탄소, 산소, 질소 등을 함유하지만 상온에서는 가압하여도 액화하지 않으므로 드라이가스라고 하며, 유전가스는 메탄 외에 프로판, 부탄 등을 함유하고 가압하면 상온에서 액화하므로 웨트가스라고 불린다.Compressed Natural Gas (CNG) refers to a gas that is naturally produced underground, but usually refers to a flammable gas mainly composed of hydrocarbons. Types of CNG are classified into oilfield gas from oilfield, coalfield gas from coalfield, and water-soluble gas that is dissolved in water regardless of the adult of oil or coal. Coal gas and water-soluble gas contain methane as the main component and contain carbon dioxide, oxygen, nitrogen, etc., but they are not liquefied even when pressurized at room temperature.Dry gas is propane, butane, etc. in addition to methane. It is called wet gas because it is liquefied.

차량에 CNG를 연료로 사용할 경우에는 가격이 싸고 경제성이 뛰어나며 혼합기가 가스상태로 공기와 혼합되어 실린더로 들어감으로써 그 상태가 균일하고 이론 공기혼합비에 가까운 값에서 완전 연소되기 때문에 연소의 효율이 높으며 엔진이 조용할 뿐만 아니라, 연소속도가 가솔린보다 느리고 옥탄가가 높으므로 노킹현상이 없다는 장점이 있다.When using CNG as a fuel in a vehicle, it is cheaper and more economical. Since the mixture is mixed with air in the gas state and enters the cylinder, the state is uniform and the combustion efficiency is high. Not only is it quiet, it has the advantage that there is no knocking phenomenon because the combustion speed is slower than gasoline and the octane number is high.

그리고, CNG 엔진은 경제성이 뛰어나며 연료비, 엔진오일 주입비, 엔진수명 등이 가솔린에 비해 탁월하며, 비점이 낮기 때문에 실린더 내에서 완전히 기화되어 오일을 묽게 만들지 않으며, 카본이 잘 생기지 않는다. 또한, 첨가제를 사용하지 않으므로 카본이나 회분에 의해 오일을 더럽히는 일이 없고 유황성분이 거의 없어 배기가스로 인한 금속 부식현상이 일어나지 않는다. 그래서, 대기오염이 적고 위생적이며 유독성 물질인 CO 의 함량이 적어 배기가스의 냄새가 거의 없고 연기도 거의 없다.In addition, the CNG engine is excellent in economic efficiency, fuel costs, engine oil injection costs, engine life, etc. are superior to gasoline, and because the boiling point is low, the gas is completely vaporized in the cylinder does not make the oil thinner, carbon is not generated. In addition, since no additives are used, the oil is not polluted by carbon or ash, and there is almost no sulfur component, so that metal corrosion due to exhaust gas does not occur. Therefore, there is little air pollution, less hygienic and less toxic CO content, so there is little smell of exhaust gas and little smoke.

그러나, 최근 환경에 대한 관심이 고조되면서 이에 따라 환경규제가 점점 더 엄격해지고 있어 CNG 자동차에 대해 활발한 연구가 진행되고 있다.However, as environmental interest has recently increased, environmental regulations have become increasingly strict, and thus, active research on CNG vehicles has been conducted.

따라서, CNG 자동차용 배기가스를 정화할 수 있는 촉매를 개발하고 있는 실정이다. 현재 CNG 배기가스 정화촉매로는 대부분 기존의 가솔린 자동차의 삼원촉매가 쓰이고 있으나, 연료희박분위기(Lean Burn)에서 작동하는 CNG 자동차에서는 메탄의 정화효율이 극히 낮은 편이다Therefore, the situation is developing a catalyst that can purify the exhaust gas for CNG vehicles. Currently, the three-way catalyst of a conventional gasoline car is used as the CNG exhaust gas purification catalyst, but the purification efficiency of methane is extremely low in a CNG car operating in a fuel burned atmosphere (Lean Burn).

이에 본 발명의 발명자들은 상기의 문제를 해결하기 위하여 연구노력한 결과, 사용되는 팔라듐(Pd)과 플라티늄(Pt)의 첨가비율을 일정비율로 조절할 경우 동일한 귀금속 담지량으로서도 메탄의 정화성능을 향상시킬 수 있는 CNG 자동차용 배기가스 정화용 촉매를 제조할 수 있음을 알게 되어 본 발명을 완성하였다.Accordingly, the inventors of the present invention have made efforts to solve the above problems. As a result, when the addition ratio of palladium (Pd) and platinum (Pt) to be used is adjusted to a certain ratio, the purifying performance of methane can be improved even with the same precious metal loading. The present invention has been completed by knowing that a catalyst for purifying exhaust gas for CNG vehicles can be prepared.

따라서, 본 발명은 CNG 자동차 배기가스 주성분인 메탄을 산소과잉분위기에서 효율적으로 정화할 수 있는 CNG 자동차 배기가스 정화용 촉매를 제공하는데 그 목적이 있다.Accordingly, an object of the present invention is to provide a catalyst for CNG vehicle exhaust gas purification, which can efficiently purify methane, which is a main component of CNG vehicle exhaust gas, in an oxygen excess atmosphere.

도 1은 실시예 1 ∼ 3 과 비교예에 의하여 제조된 촉매의 라이트오프를 측정한 결과를 나타낸 그래프이다.1 is a graph showing the results of measuring the light off of the catalysts prepared according to Examples 1 to 3 and Comparative Examples.

본 발명은 압축천연가스 자동차 배기가스 정화용 촉매에 있어서, 세라믹 담체에 상기 담체 1L 당 20 ∼ 200 g의 γ-Al2O3, 1 ∼ 50 g의 La2O3, 1 ∼ 50 g의 CeO2, 1 ∼ 20 g의 BaO 및 촉매 활성 물질로서 팔라듐(Pd) : 플라티늄(Pt)의 중량비율이 5 ∼ 15 : 1 인 팔라듐(Pd)과 플라티늄(Pt)의 혼합물이 0.1 ∼ 10 g 담지된 압축천연가스 자동차 배기가스 정화용 촉매를 그 특징으로 한다.The present invention relates to a compressed natural gas vehicle exhaust gas purifying catalyst, the ceramic carrier on CeO of the support 20 ~ 200 g of γ-Al 2 O 3, 1 ~ 50 g of La 2 O 3, 1 ~ 50 g per 1L 2 , 1 to 20 g of BaO and 0.1 to 10 g of a mixture of palladium (Pd) and platinum (Pt) having a weight ratio of palladium (Pd) to platinum (Pt) of 5 to 15: 1 as catalyst active material It is characterized by a catalyst for the purification of natural gas automobile exhaust gas.

본 발명은 기존의 정화촉매와 동일한 비율의 귀금속을 사용하면서도 CNG 자동차 배기가스 중 메탄을 효율적으로 정화할 수 있는 개선된 CNG 자동차 배기가스 정화용 촉매를 제공한다.The present invention provides an improved CNG vehicle exhaust gas purification catalyst capable of efficiently purifying methane in CNG vehicle exhaust gas while using precious metals in the same ratio as a conventional purification catalyst.

이하 본 발명을 더욱 상세하게 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail.

본 발명의 CNG 자동차 배기가스 정화용 촉매는 세라믹 담계 1L 당 활성물질로서 팔라듐(Pd) : 플라티늄(Pt)의 중량비율이 5 ∼ 15 : 1 인 팔라듐(Pd)과 플라티늄(Pt)의 혼합물이 0.1 ∼ 10 g 담지됨으로써 CNG를 사용하는 자동차 배기가스의 대부분을 구성하는 메탄을 효율적으로 정화할 수 있다.CNG automobile exhaust gas purification catalyst of the present invention is a mixture of palladium (Pd) and platinum (Pt) having a weight ratio of palladium (Pd) to platinum (Pt) of 5 to 15: 1 as an active substance per 1L of ceramic freshwater. By supporting 10 g, it is possible to efficiently purify the methane which constitutes most of the automobile exhaust gas using CNG.

이때, 상기 팔라듐(Pd)과 플라티늄(Pt)의 중량비가 5 : 1 미만이면 플라티늄(Pt) 양이 많아 팔라듐(Pd) 단독에 비해 메탄저감 효과가 작고, 15 : 1 을 초과하면 플라티늄(Pt) 양이 적어 메탄저감 향상효과가 작은 문제점이 있다. 또한, 팔라듐(Pd)과 플라티늄(Pt)으로 이루어진 촉매 활성 물질은 세라믹 담체 1L당 0.1 ∼ 10 g를 담지시키는 것이 바람직하며, 만일 이의 함량이 0.1 g 미만이면 메탄의 정화활성이 낮은 문제점이 있으며, 10 g 을 초과하면 더 이상의 메탄의 정화활성의 향상을 얻을 수 없는 문제점이 있다.At this time, when the weight ratio of the palladium (Pd) and platinum (Pt) is less than 5: 1, the amount of platinum (Pt) is large, so the methane reduction effect is smaller than that of palladium (Pd) alone, and when it exceeds 15: 1, platinum (Pt) The amount is small, there is a small problem of improving the methane reduction. In addition, the catalytically active material consisting of palladium (Pd) and platinum (Pt) preferably supports 0.1 to 10 g per 1 L of the ceramic carrier, and if its content is less than 0.1 g, there is a problem of low methane purification activity. If it exceeds 10 g, there is a problem that no further improvement of the purification activity of methane can be obtained.

본 발명에서는 기존의 귀금속 촉매 활성물질의 사용량과 동일량을 사용할 경우에도 사용되는 그 배합비율을 조절하므로써 기존의 경우 산소과잉 분위기에서의 낮은 메탄 정화효율의 문제점을 해결하고, 또한 메탄의 정화 효율을 높임으로써 CNG 자동차 배기가스 정화용 촉매의 기능적인 측면을 개선하고, 비용을 절감할 수 있는 효과를 동시에 얻을 수 있다.The present invention solves the problem of low methane purification efficiency in an oxygen-excess atmosphere by adjusting the compounding ratio used even when using the same amount as the amount of the conventional noble metal catalyst active material, and also improves the purification efficiency of methane. By improving the functional aspect of the catalyst for CNG automobile exhaust purification, and at the same time, the cost can be reduced.

세라믹 담체에 대한 담지를 위한 귀금속의 소오스로는 귀금속의 염화물, 질산염 및 초산염 등이 사용될 수 있으며, 또한 촉매에서 담지층으로 사용되는 활성 알루미나(γ-Al2O3) 및 조촉매로 사용되는 La2O3, CeO2및 BaO의 소오스로는 상기 알루미나 또는 조촉매의 산화물, 질산염, 초산염 및 황산염 등이 사용될 수 있다.As the source of the precious metal for supporting the ceramic carrier, chlorides, nitrates and acetates of the precious metal may be used, and La used as a co-catalyst and activated alumina (γ-Al 2 O 3 ) used as a supporting layer in the catalyst. As sources of 2 O 3 , CeO 2, and BaO, oxides, nitrates, acetates, sulfates, etc. of the alumina or cocatalyst may be used.

이와 같은 본 발명을 실시예에 의거하여 보다 구체적으로 설명하겠는바, 본 발명이 다음 실시예에 의하여 한정되는 것은 아니다.The present invention will be described in more detail with reference to Examples, but the present invention is not limited by the following Examples.

실시예 1Example 1

란타나(La2O3)가 5% 도핑되었으며, 비표면적이 100 ㎡/g인 활성 알루미나(γ-Al2O3) 분체와, 비표면적이 각각 4 ㎡/g인 CeO2분체와 BaO 분체를 습식 분쇄하여 슬러리를 제조하였다. 이에 팔라듐염화염(H2PdCl6)와 플라티늄염화염(H2PtCl6)를 5 : 1 의 중량비(귀금속 베이스)로서 세라믹 담체 1L당 팔라듐(Pd)을 2.5 g, 플라티늄(Pt)을 0.5 g 섞어 슬러리를 제조하였다. 그 후, 상기 슬러리를 세라믹 담체에 담지하기 위해 도포하였는데, 담지량은 세라믹 담체 1L당 활성 알루미나 100 g, CeO210 g, 및 BaO가 5 g이었다. 이어서, 상기 도포된 세라믹 담체를 150 ℃에서 1시간 건조시킨 다음, 550 ℃의 온도에서 1시간 소성하였다.5% doped lantana (La 2 O 3 ), activated alumina (γ-Al 2 O 3 ) powder with a specific surface area of 100 m 2 / g, CeO 2 powder and BaO powder with a specific surface area of 4 m 2 / g, respectively The slurry was prepared by wet grinding. Thus, palladium chloride (H 2 PdCl 6 ) and platinum salt (H 2 PtCl 6 ) in a weight ratio of 5: 1 (noble metal base) 2.5 g of palladium (Pd) and 0.5 g of platinum (Pt) per 1 L of the ceramic carrier. Mixing to prepare a slurry. Thereafter, the slurry was applied to support the ceramic carrier, and the supporting amount was 100 g of activated alumina, 10 g of CeO 2 , and 5 g of BaO per liter of the ceramic carrier. Subsequently, the applied ceramic carrier was dried at 150 ° C. for 1 hour, and then calcined at 550 ° C. for 1 hour.

촉매가 프레시(fresh)한 상태에서의 활성특성을 알아보기 위해 모델가스를 이용하여 라이트-오프 테스트(Light-off Test)를 실시하였으며, 라이트-오프 테스트에 있어서, 상기 촉매의 메탄이 50 % 정화되는 온도(LOT 50)는 284 ℃이었고, 그 결과는 첨부도면 도1에서 -●-로 나타내었다.A light-off test was conducted using a model gas to determine the activity characteristics of the catalyst in the fresh state. In the light-off test, methane of the catalyst was purified by 50%. The resulting temperature (LOT 50) was 284 ° C., and the results are shown as--in FIG. 1.

모델가스 조성은 다음 표 1과 같으며, 상온에서 450 ℃까지 15 ℃/분의 승온속도로 메탄의 정화 효율을 측정하였으며, 이때의 공간속도는 80,000/hr이었다.The model gas composition is shown in Table 1 below, and the purification efficiency of methane was measured at a temperature rising rate of 15 ° C./minute from room temperature to 450 ° C., and the space velocity was 80,000 / hr.

성분ingredient CH4 CH 4 COCO NONO O2 O 2 H2OH 2 O CO2 CO 2 N2 N 2 함량content 900ppm900 ppm 350ppm350 ppm 550ppm550 ppm 8.52%8.52% 10%10% 7.51%7.51% 발렌스Valence

실시예 2Example 2

상기 실시예 1과 동일한 제조방법으로 촉매를 제조하였으며, 이에 팔라듐염화염(H2PdCl6)와 플라티늄염화염(H2PtCl6)를 10 : 1 의 중량비(귀금속 베이스)로서 세라믹 담체 1L당 팔라듐(Pd)을 2.73 g, 플라티늄(Pt) 0.27 g 섞어 슬러리를 제조하였다.A catalyst was prepared in the same manner as in Example 1, whereby palladium chloride (H 2 PdCl 6 ) and platinum chloride (H 2 PtCl 6 ) were added in a weight ratio (noble metal base) of 10: 1 to palladium per liter of the ceramic carrier. 2.73 g of (Pd) and 0.27 g of platinum (Pt) were mixed to prepare a slurry.

라이트-오프 테스트시, LOT 50은 290 ℃이었으며, 그 결과는 첨부도면 도1에서 -◆-로 나타내었다.In the light-off test, LOT 50 was 290 ° C., and the result is indicated by-◆-in the accompanying drawings.

실시예 3Example 3

상기 실시예 1과 동일한 제조방법으로 촉매를 제조하였으며, 이에 팔라듐(Pd)염화염(H2PdCl6)와 플라티늄염화염(H2PtCl6)를 15 : 1 의 중량비(귀금속베이스)로서 세라믹 담체 1L당 팔라듐(Pd)을 2.81 g, 플라티늄(Pt)을 0.19 g 섞어 슬러리를 제조하였다.A catalyst was prepared in the same manner as in Example 1, whereby a palladium (Pd) chloride (H 2 PdCl 6 ) and a platinum chloride (H 2 PtCl 6 ) were added in a ceramic carrier at a weight ratio of 15: 1 (noble metal base). A slurry was prepared by mixing 2.81 g of palladium (Pd) and 0.19 g of platinum (Pt) per 1 L.

라이트-오프 테스트시, LOT 50은 301 ℃이었으며, 그 결과는 첨부도면 도1에서 -▲-로 나타내었다.In the light-off test, LOT 50 was 301 ° C., and the result is shown as − ▲ − in the accompanying drawings.

비교예Comparative example

상기 실시예 1과 동일한 제조방법으로 촉매를 제조하였으며, 팔라듐(Pd)의 담지량이 세라믹 담체 1L당 3 g인 팔라듐(Pd) 촉매를 제조하였다. 라이트-오프 테스트시, LOT 50은 310 ℃이었으며, 그 결과는 첨부도면 도1에서 -○-로 나타내었다.The catalyst was prepared in the same manner as in Example 1, and a palladium (Pd) catalyst having a supported amount of palladium (Pd) of 3 g per 1 L of the ceramic carrier was prepared. In the light-off test, LOT 50 was 310 ° C., and the result is indicated by-○-in the accompanying drawings.

상기한 바와 같이, 사용되는 귀금속 활성물질로서 팔라듐(Pd)과 플라티늄의 배합비율을 이상적으로 조절하므로써, 동일한 양이 귀금속 촉매 활성물질을 사용하더라도 라이트 오프 테스트시 LOT 50을 감소시킬 수 있었으며, 따라서 메탄을 효율적으로 정화시킬 수 있으며, 동시에 원료물질에 소요되는 비용을 절감할 수 있는 경제적인 효과가 있다.As described above, by ideally adjusting the mixing ratio of palladium (Pd) and platinum as the noble metal active material used, it was possible to reduce LOT 50 in the light-off test even when the same amount of the noble metal catalyst active material was used, thus methane Can be efficiently purified and at the same time economical to reduce the cost of the raw materials.

Claims (1)

압축천연가스 자동차 배기가스 정화용 촉매에 있어서, 세라믹 담체에 상기 담체 1L 당 20 ∼ 200 g의 γ-Al2O3, 1 ∼ 50 g의 La2O3, 1 ∼ 50 g의 CeO2, 1 ∼ 20 g의 BaO 및 촉매 활성 물질로서 팔라듐(Pd) : 플라티늄(Pt)의 중량비율이 5 ∼ 15 : 1 인 팔라듐(Pd)과 플라티늄(Pt)의 혼합물이 0.1 ∼ 10 g 담지된 것을 특징으로 하는 압축천연가스 자동차 배기가스 정화용 촉매.Compressed natural gas catalyst for automobile exhaust gas purification, 20 to 200 g of γ-Al 2 O 3 , 1 to 50 g of La 2 O 3 , 1 to 50 g of CeO 2 , 20 g of BaO and a catalytically active substance, characterized in that 0.1-10 g of a mixture of palladium (Pd) and platinum (Pt) having a weight ratio of palladium (Pd) to platinum (Pt) of 5 to 15: 1 is supported. Catalysts for the purification of natural gas automobile exhaust gases.
KR10-2002-0024832A 2002-05-06 2002-05-06 A catalyst of exhaust gas for compressed natural gas KR100461125B1 (en)

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WO2015099348A1 (en) 2013-12-24 2015-07-02 희성촉매 주식회사 Exhaust gas oxidation catalyst for compressed natural gas combustion system
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KR100230874B1 (en) * 1997-05-09 1999-11-15 류정열 Method for purifying exhaust gases of cng automobiles
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KR101186341B1 (en) 2009-10-14 2012-09-26 오덱(주) Catalyst for purifying exhaust gas of CNG vehicle and method of preparing the same.
WO2015099348A1 (en) 2013-12-24 2015-07-02 희성촉매 주식회사 Exhaust gas oxidation catalyst for compressed natural gas combustion system
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US10751701B2 (en) 2015-12-23 2020-08-25 Heesung Catalysts Corporation Oxidation catalyst for compressed natural gas combustion system exhaust gas
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