GASOLINE ENGINE EMISSIONS TREATMENT SYSTEMS HAVING GASOLINE PARTICULATE FILTERS

• Main Authors: STEPHAN SIEMUND, MIRKO ARNOLD, KNUT WASSERMANN, ATTILIO SIANI
• Format: Patent
• Language: English; Japanese
• Published: 02.02.2017
• Subjects: BLASTING; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; STEAM ENGINES; THEIR RELEVANT APPARATUS; TRANSPORTING; WEAPONS

PROBLEM TO BE SOLVED: To provide exhaust systems and components suitable for use in conjunction with gasoline engines to capture particulates in addition to reducing gaseous emission such as hydrocarbons, nitrogen oxides, and carbon monoxide.SOLUTION: There are provided exhaust treatment systems comprising a three-way conversion (TWC) catalyst located on a particulate filters. Coated particle filters having wash coat loadings in the range of 1 to 4 g/ft result in minimal impact on back pressure while simultaneously providing TWC catalytic activity and particle trapping functionality High levels of oxygen storage components are also delivered on and/or within the filter. The filters can have a coated porosity that is substantially the same as its uncoated porosity. The TWC catalytic material can comprise a particle diameter distribution such that a first set of particles has a first dparticle diameter of 7.5 μm or less and a second set of particles has a second dparticle diameter of more than 7.5 μm. Methods of making and using the filters are also provided.SELECTED DRAWING: None 【課題】炭化水素、窒素酸化物、および一酸化炭素等のガス排出を低減することに加えて、微粒子を捕捉するためにガソリンエンジンと組み合わせて使用するのに適した排気システムおよび構成要素。【解決手段】微粒子フィルター上に位置する三元変換（ＴＷＣ）触媒を含む排気処理システム。１〜４ｇ／ｆｔの範囲のウォッシュコート充填を有する被覆粒子フィルターは、背圧に対して最小限の影響をもたらし、ＴＷＣ触媒活性および粒子トラップ機能性を提供する。高レベルの酸素吸蔵成分もまた、フィルター上および／またはフィルター内に送達される。フィルターは、その非被覆多孔度と実質的に同じである被覆多孔度を有することができる。ＴＷＣ触媒材料は、第１の組の粒子が７．５μｍ以下の第１のｄ90粒径を有し、第２の組の粒子が７．５μｍを超える第２のｄ90粒径を有する、粒径分布を含むことができる。本フィルターを製作および使用する方法。【選択図】なし