CN103269774A - NOx存储组分 - Google Patents

NOx存储组分 Download PDF

Info

Publication number
CN103269774A
CN103269774A CN2011800510827A CN201180051082A CN103269774A CN 103269774 A CN103269774 A CN 103269774A CN 2011800510827 A CN2011800510827 A CN 2011800510827A CN 201180051082 A CN201180051082 A CN 201180051082A CN 103269774 A CN103269774 A CN 103269774A
Authority
CN
China
Prior art keywords
storage component
oxide
platinum group
group metal
caesium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2011800510827A
Other languages
English (en)
Other versions
CN103269774B (zh
Inventor
J·A·库珀
M·A·霍华德
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Johnson Matthey PLC
Original Assignee
Johnson Matthey PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Johnson Matthey PLC filed Critical Johnson Matthey PLC
Publication of CN103269774A publication Critical patent/CN103269774A/zh
Application granted granted Critical
Publication of CN103269774B publication Critical patent/CN103269774B/zh
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/92Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404Removing only nitrogen compounds
    • B01D53/9409Nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/92Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404Removing only nitrogen compounds
    • B01D53/9409Nitrogen oxides
    • B01D53/9413Processes characterised by a specific catalyst
    • B01D53/9422Processes characterised by a specific catalyst for removing nitrogen oxides by NOx storage or reduction by cyclic switching between lean and rich exhaust gases (LNT, NSC, NSR)
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/92Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/54Nitrogen compounds
    • B01D53/56Nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/92Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404Removing only nitrogen compounds
    • B01D53/9409Nitrogen oxides
    • B01D53/9413Processes characterised by a specific catalyst
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/92Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404Removing only nitrogen compounds
    • B01D53/9409Nitrogen oxides
    • B01D53/9431Processes characterised by a specific device
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/06Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
    • B01J21/08Silica
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/02Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the alkali- or alkaline earth metals or beryllium
    • B01J23/04Alkali metals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/40Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/40Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B01J23/46Ruthenium, rhodium, osmium or iridium
    • B01J23/464Rhodium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56Platinum group metals
    • B01J23/58Platinum group metals with alkali- or alkaline earth metals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56Platinum group metals
    • B01J23/63Platinum group metals with rare earths or actinides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00Catalysts, in general, characterised by their form or physical properties
    • B01J35/50Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/56Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02Impregnation, coating or precipitation
    • B01J37/024Multiple impregnation or coating
    • B01J37/0244Coatings comprising several layers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871Regulation of absorbents or adsorbents, e.g. purging
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0885Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/10Noble metals or compounds thereof
    • B01D2255/102Platinum group metals
    • B01D2255/1021Platinum
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/10Noble metals or compounds thereof
    • B01D2255/102Platinum group metals
    • B01D2255/1023Palladium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/10Noble metals or compounds thereof
    • B01D2255/102Platinum group metals
    • B01D2255/1025Rhodium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/20Metals or compounds thereof
    • B01D2255/202Alkali metals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/20Metals or compounds thereof
    • B01D2255/204Alkaline earth metals
    • B01D2255/2042Barium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/20Metals or compounds thereof
    • B01D2255/206Rare earth metals
    • B01D2255/2063Lanthanum
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/20Metals or compounds thereof
    • B01D2255/206Rare earth metals
    • B01D2255/2065Cerium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/20Metals or compounds thereof
    • B01D2255/206Rare earth metals
    • B01D2255/2068Neodymium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/20Metals or compounds thereof
    • B01D2255/207Transition metals
    • B01D2255/20715Zirconium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/20Metals or compounds thereof
    • B01D2255/209Other metals
    • B01D2255/2092Aluminium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/30Silica
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/90Physical characteristics of catalysts
    • B01D2255/902Multilayered catalyst
    • B01D2255/9022Two layers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/90Physical characteristics of catalysts
    • B01D2255/91NOx-storage component incorporated in the catalyst
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/01Engine exhaust gases
    • B01D2258/012Diesel engines and lean burn gasoline engines

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

一种NOx存储组分,包括铯硅酸盐(Cs2SiO3)和至少一种铂族金属。本发明也包括NOx吸附催化剂,包括设置在基底整料上的本发明的NOx存储组分;处理来自稀燃内燃机的含NOx排气的方法,包括将包括铯硅酸盐(Cs2SiO3)和至少一种铂族金属的NOx存储组分与含NOx的贫排气接触以在其上吸附NOx;和周期性地通过NOx存储组分与化学当量的或富排气接触以解吸被吸附的NOx的步骤;和制造本发明的NOx存储组分的方法,包括使至少一种铂族金属盐水溶液、铯盐水溶液和二氧化硅源组合和反应的步骤。

Description

NOx存储组分
技术领域
本发明涉及一种新的NOx存储组分和含有其的NOx吸附催化剂(NAC),用于处理来自由稀燃内燃机驱动的车辆的排气,包括由例如电动机和稀燃内燃机的混合动力源驱动的车辆。本发明的NOx吸附催化剂特别应用于处理来自车辆内燃机的排气,比如压缩点火(例如柴油发动机)和强制点火发动机,比如稀燃汽油发动机。
背景技术
NOx吸附催化剂(NAC)是公知的,例如从美国专利号5,473,887中可知,其用来从贫排气(λ>1)中吸附氮氧化物(NOx),并且当排气中的氧浓度主动地-与被动地相反-降低时解吸NOx。这样的氧浓度主动降低被称为NAC的NOx吸附活性″再生″或NAC上吸附的NOx的″吹扫″。解吸的NOx可用例如汽油燃料的适当的还原剂由NAC本身的或位于NAC下游的例如铑的催化剂组分促进还原为N2。实际中,氧浓度可根据计算的NAC剩余NOx吸附能力间歇地主动调节至要求的氧化还原组成,例如调节至比正常的发动机运转操作含量更高(但仍是贫化学当量的,即λ=1组成),至化学当量的或至富化学当量的(λ<1)。可通过多种手段调节氧浓度,例如节流,例如在排气冲程将额外的烃类燃料注入到发动机气缸中,或直接地将烃类燃料注入到发动机歧管的排气下游。
现有技术中公开的典型的NAC配方包括催化氧化组分例如铂,显著量即显著地超过需要的促进剂的NOx-存储组分(典型地为碱金属或碱土金属)例如钡以及还原催化剂例如铑。这个配方通常给出的来自贫排气的NOx-存储的一个机理是:
NO+1/2O2→NO2(1);和
BaO+NO2+1/2O2→Ba(NO3)2(2),
其中在反应(1)中,一氧化一氮在铂上的活性氧化点与氧反应形成NO2。反应(2)涉及由无机硝酸盐形式的存储材料吸附NO2
在较低的氧浓度和/或高温时,硝酸盐类变得热力学不稳定并分解,按照以下反应(3)产生NO和/或NO2。存在适当的还原剂时,这些氮氧化物随后被一氧化碳、氢和烃类还原为N2,其可在还原催化剂上发生(见反应(4))。
Ba(NO3)2→BaO+2NO+3/2O2或Ba(NO3)2→BaO+2NO2+1/2O2(3);和
NO+CO→1/2N2+CO2     (4);
(其他的反应包括Ba(NO3)2+8H2→BaO+2NH3+5H2O随后NH3+NOx→N2+yH2O或2NH3+2O2+CO→N2+3H2O+CO2等等)。
在上述反应(1)-(4)中,反应性钡类以氧化物提供。然而,应当理解,在空气存在下,大部分钡以碳酸盐或可能的氢氧化物形式存在。本领域技术人员可按照不同于氧化物的钡类和排气流中的催化涂层序列,或使用其他的碱土金属例如Sr、Mg或Ca,或碱金属例如K或Cs,从而修改上述反应流程。
基于碱金属的NOx存储组分有较高水平的NOx存储,因此他们的使用是合意的。然而,其使用有许多缺陷。这包括碱金属从催化剂迁移进入催化剂涂覆的陶瓷单体基底,催化剂使用期间碱金属的气化,例如发动机冷起动期间排气系统中存在的液态水浸出碱金属,碱金属在催化活化涂层和由Pt烃类转化效率降低的层之间的迁移(关于这最后的缺陷,见WO02/22241)。
现有技术公开了许多NOx存储组分。例如,US6,497,848公开了一种催化捕获剂,用锂、钠或钾的碱性氧化化合物有效的转化排气流中对高温反应惰性的NOx。催化捕获剂基本上不含硅组分并可包括含有耐火金属氧化物载体的催化捕获剂材料,例如,矾土,其上分散有催化组分,例如铂族金属催化组分,和NOx吸附剂,包含一种或多种碱性氧化化合物。
US6,727,202公开了一种催化捕获器,包括催化捕获剂材料和耐火载体元件,所述催化捕获剂材料位于该载体元件上。催化捕获剂材料包括:(i)耐火金属氧化物载体;(ii)催化组分,化学当量或富化学当量的条件下有效促进NOx的还原;和(iii)NOx吸附剂,贫的条件下有效吸附NOx并在化学当量或富的条件下解吸并还原NOx为氮。NOx吸附剂包括金属氧化物,选自一种或碱金属氧化物,碱土金属氧化物和一种或更多种碱金属氧化物和碱土金属氧化物的混合物。锰组分选自以下组成的组:(1)锰氧化物,(2)锰和过渡金属和/或稀土金属的混合氧化物,(3)碱金属和锰氧化物的复合物,(4)碱土金属和锰氧化物的复合物以及(5)上述氧化物和复合物的混合物。明确地排除组分(a)中碱金属氧化物和硅或任何含硅化合物的组合。
WO97/02886公开了一种NOx消除组合物,包括NOx消除催化剂和NOx吸附材料,这两种材料在共用的耐火载体元件上彼此接近地分散但隔离。NOx吸附材料包括碱性氧化金属化合物和选择性地进一步包括氧化铈。NOx消除催化剂包含催化金属组分,包括铂族金属催化组分。催化金属组分与NOx吸附材料隔离,其可为一种或多种金属氧化物、金属碳酸盐、金属氢氧化物和混合金属氧化物。至少催化金属组分和NOx吸附材料必须包括分离的粒子或在其上,粒子可以是混合的或者可位于载体元件的独立的层中。
US5,451,558公开了一种在燃气轮机中降低NOx、CO和SO2排放水平的方法。催化吸附剂,优选由氧化铝/铂/碳酸盐制成,用于氧化污染物氧化物并吸附它们。
US2006/0035782公开了一种抗粗化汽车排气催化剂组合物,包括金属化合物或含金属的化合物和具有与无机酸的共轭碱性氧化物键合的碱金属或碱土金属离子的组分。碱性氧化物共轭的无机酸的Ka,使得汽车排气催化剂组合物抵抗减少表面积的相变。该发明也供应一种NOx捕获剂,其包括该发明的排气催化剂组合物。
WO02/22241公开了一种NOx-捕获组合物,包括:(a)至少一种第一NOx存储组分,包括在至少一种第一载体材料上负载的至少一种碱金属;和(b)铂氧化催化剂和至少一种第二NOx存储组分,不是负载在至少一种第二载体材料上的碱金属,从而铂氧化催化剂和至少一种碱金属物理上隔离,因而基本上维持铂氧化催化剂的烃转化活性。
历史上,车用柴油机已经设计用来满足四个特征的某种组合:燃料效率;控制NOx排放;功率输出;和颗粒物质控制。早期的排放标准限制了一氧化碳和烃类的可允许的排放量,其迫使设置柴油机氧化催化剂以符合标准。欧5排放标准初期,最容易通过调整发动机以控制NOx排放并在排气系统提供过滤器以捕获颗粒物质(所谓的NOx/颗粒物质平衡)满足。对于欧6和美国的提议,没有过滤器时仿佛难以满足微粒排放标准(现在包括减少微粒数量排放的要求),另外是否要求额外的基于催化剂的NOx除去策略。因而有可能时,设想一个排气系统,没有过滤器时包括流动通过的基底整料上的NOx吸附催化剂以满足例如欧洲的排放标准,通常我们希望系统包括位于流动通过型基底上的NOx吸附催化剂与过滤器的某种结合使用,或NOx吸附催化剂涂覆在过滤器基底整料上,例如壁流过滤器。
轻型柴油机车辆设置的典型的排气系统,包括流动通过型基底整料上的NOx吸附催化剂和位于其下游(即普通流动方向上)的催化烟尘过滤器(CSF)。与这样的系统中使用的NOx吸附催化剂发展相关的典型问题包括低温下的NOx存储和NOx再生、较高的流速和较高的烃类排气条件。现代的柴油汽车燃料通常使用已知的排气再循环(EGR)的工程解决方案,以更好控制NOx排放,其中在至少一些内部程序化发动机速度/负荷图中,一部分排气再循环到发动机进气。排气系统中EGR的排气点有助于上述问题。一种典型的设置是从CSF的下游取EGR排气,称为低压(或″长环″)EGR。
发明内容
我们非常惊奇地发现,铯可以通过形成铯硅酸盐而稳定,使得上述缺陷被减少或避免,却保持在上文反应(2)和(3)的循环NOx吸附及解吸附过程的活性。铯的稳定导致其在催化剂老化期间更多的保持在活化涂层中,因此NOx捕获器具有更好的性能。
按照本发明,提供一种NOx存储组分,包括铯硅酸盐(Cs2SiO3)和至少一种铂族金属。
铯硅酸盐的一个有用的优点是其不溶于水,因此铯将较少随着发动机冷起动而移动和挥发。
附图说明
为了更完全地理解本发明,仅通过图解的方式和随图的附图标记提供下列实施例,其中:
图1为图表,将累积的尾部管NOx排放(其来自装有双层(即完全配方的)包括本发明中的铯硅酸盐的NOx吸附催化剂(NAC)的汽车)与对比用的没有铯或只含可溶解铯的NAC相比较。
发明详细描述
当我们通过实验发现可以利用市场上可买到的″松散(bulk)″铯硅酸盐(从Alfa Aesar获得)获得本发明的优点时,我们发现包括至少一种铂族金属的铯硅酸盐溶胶产生显著地更佳性能,其是通过胶态二氧化硅和铯硝酸盐水溶液在铂族金属盐水溶液存在下反应制备的。我们相信这是因为使用的胶态二氧化硅的粒度(粒径~22nm)导致活化涂层中非常细小的铯硅酸盐粒子。使用的松散的Cs2SiO3有相对大的粒度,因此我们相信产生的NOx储存与释放性能是有限的。
在NOx存储组分(其中铯硅酸盐负载在耐火金属氧化物上)中,耐火金属氧化物载体可选自氧化铝、二氧化硅、氧化镁、无定形二氧化硅-氧化铝、二氧化钛、氧化锆、松散氧化铈、分子筛或其中任意两种或更多种的混合物、复合氧化物或混合氧化物。具体的耐火金属氧化物是均质的铝酸镁。我们已经调查过许多均质铝酸镁以用于NOx吸附催化剂,并发现以MgO.nAl2O3,n≥1.5为代表的均质铝酸镁是优选的。特别优选的均质铝酸镁是n为4。
为了改善水热稳定性,该耐火盒属氧化物载体可掺入一种或多种二氧化硅和稀土元素,例如镧、钕、钇等等。
此处提到可还原的氧化物例如氧化铈(或任何其他的组分)所使用的术语″松散″是指氧化铈以其固体颗粒存在。这些粒子通常很细微,大约至少90%的粒子直径为约0.5到15微米。术语″松散″是用来区别其中氧化铈″分散″在耐火载体材料上的情况,例如通过从例如硝酸铈的溶液或该组分的某种其它的液体分散体浸渍入载体材料,然后干燥和焙烧以在耐火载体表面上转化浸渍的硝酸铈为氧化铈粒子的分散体。产物氧化铈因而在耐火载体的表层上″分散″并且以较大或较小的程度在表层内部“分散”。分散的氧化铈不以松散形式存在,因为松散氧化铈包括氧化铈的细微固体颗粒。
在具体实施方式中,存在于该NOx存储组分中的该或各铂族金属选自铂、钯、铑和其中任意两种或更多的混合物。然而,在完全配方的层状NOx吸附催化剂(见实施例)中使用的优选具体实施方式中,存在于NOx存储组分中的铂族金属是铑。
在优选具体实施方式中,耐火氧化物载体也负载稀土氧化物,例如氧化铈或氧化镨,优选氧化铈。
现有技术表明锰可以促进NOx存储组分(例如钡)的能力(见US6,727,202)。我们已经发现锰可以促进本发明的包括铯硅酸盐的NOx存储组分的活性。
按照另一方面,本发明提供一种NOx吸附催化剂,包括按照本发明设置在基底整料上的NOx存储组分。
按照一个具体实施方式,本发明的NOx吸附催化剂包括至少一种碱土金属。
在优选的方案中,NOx吸附催化剂包括两个或更多层,其中铯硅酸盐NOx存储组分设置在第一层并且至少一种碱土金属设置在第二层。在特别优选的方案中,第一层位于第二层上面,或者直接地铺在第二层上或者其中一个(或更多)层插入第一层和第二层之间。
在优选的具体实施方式中,第二层包括铂、钯或、铂和钯两者。
按照另一方面,提供用于稀燃内燃机的排气系统,包括本发明的NOx吸附催化剂。
在另一方面,提供包括本发明的排气系统的汽车。
按照另一方面,提供一种处理含有来自稀燃内燃机的NOx的排气的方法,该方法包括使含有铯硅酸盐(Cs2SiO3)和至少一种铂族金属的NOx存储组分与含有NOx的贫排气接触以在其上吸附NOx的步骤;以及通过NOx存储组分与化学当量的或富的排气接触以周期地解吸被吸附的NOx的步骤。
按照另一方面,提供一种制造本发明的NOx存储组分的方法,该方法包括使至少一种铂族金属盐的水溶液、铯盐水溶液和二氧化硅源混合和反应的步骤。
优选地,二氧化硅源是胶态二氧化硅,即溶胶,例如粒径大约22nm(其商业上可获得,商品名为Ludox(W.R.Grace&Co.))。或者,二氧化硅源可以是沸石、无定形二氧化硅-氧化铝、微粒二氧化硅或水溶性二氧化硅化合物。我们通过混合微粒二氧化硅(S30)和铯盐(铯硝酸盐(CsNO3))水溶液,然后喷雾干燥生成的浆料,然后焙烧生成的产品,制备了一种NOx存储组分。生成的铯硅酸盐然后与铂族金属水溶液混合,然后该组合物被干燥和焙烧以生产本发明的NOx存储组分。
一种可替换的现场制备方法是例如通过浸渍将铯盐负载在适当的载体(例如氧化铝)上,并且随后将该组分和在同一层里负载至少一种铂族金属的二氧化硅源组分结合,或者将铯盐水溶液和硅盐水溶液共沉淀在适当的载体上,然后将其与铂族金属水溶液混合,或者通过在包括负载至少一种铂族金属的二氧化硅组分源的层下面的层里的NOx吸附催化剂配方中设置负载的铯组分。使用中,铯可迁移远离原始的载体材料,但是当其接触覆盖层中的二氧化硅源时,其可形成铯硅酸盐。
实施例
比较例1-制备仅含钡的NAC
通过高表面积γ氧化铝与水形成浆料然后加入适当量的Pt和Pd溶液,制备第一层活化涂层。最终的活化涂层中Pt和Pd的含量分别是0.41和0.17%。钡然后以醋酸盐的形式加入该活化涂层。最终催化剂中负载的钡为600g/ft3
活化涂层用美国专利号7,147,892中描述的方法涂覆在陶瓷蜂窝基底整料上,其尺寸为4.16×4.5英寸,单元密度为400,单元壁厚度为4千分之一英寸。涂层然后在100℃空气中干燥,随后在550℃空气中焙烧。
通过将掺杂有稀土金属镧和钕的高表面积氧化锆以及高表面积γ氧化铝在水中形成浆料,制备第二层活化涂层。随后将硝酸铑加入该活化涂层。最终的活化涂层中Rh含量为0.062%。随后加入硝酸铈,用来提供400g/ft3的铈负载。随后利用如上所述的方法将该活化涂层涂覆在之前经过干燥和焙烧的层上,并且利用与第一层相同的条件干燥和焙烧所得部分。
比较例2-制备含钡和可溶性铯的NAC
如比较例1所述,在相同的基底整料上制备和涂覆第一层。
第二层活化涂层的制备与比较例1相同,不同之处在于:铯硝酸盐在加入硝酸铑之后和加入铈以前加入到活化涂层中,使得最终的催化剂中铯负载为200g/ft3
实施例3-制备含钡和松散Cs2SiO3的NAC
如比较例1所述,在相同的基底整料上制备和涂覆第一层。
第二层活化涂层的制备与比较例1相同,不同之处在于:铯硅酸盐(Alfa Aesar)在加入硝酸铑之后和加入铈以前加入到活化涂层中,使得最终的催化剂中铯负载为200g/ft3
实施例4-制备含钡和胶态Cs2SiO3的NAC
如比较例1所述,在相同的基底整料上制备和涂覆第一层。
通过将掺杂稀土金属镧和钕的高表面积氧化锆以及高表面积γ氧化铝在水中形成浆料,制备第二层。随后向该活化涂层加入硝酸铑。然后向该活化涂层中加入胶态二氧化硅(Ludox AS40(W.R.Grace&Co.))和铯硝酸盐。加入足够的铯以使得最终的催化剂中铯负载为200g/ft3。加入足够的Ludox以使得最终的催化剂中铯和硅的原子比为2∶1。随后加入硝酸铈以提供400g/ft3的铈负载。随后利用如上所述的方法将该活化涂层涂覆在之前经过干燥和焙烧的层上,并且所得部分利用与第一层相同的条件干燥和焙烧。
实施例5-催化剂测试
按照本发明比较例1和2和实施例3和4的新鲜催化剂涂覆的基底整料(″块料″)在安装4.5升V8汽油发动机的工作台的排气系统中老化,控制发动机在具有周期贫峰的λ1运行。NAC位于紧耦合的三元催化剂下游的对应于汽车底盘位置的位置。发动机使用足以产生块料内温度830℃的负荷运行。每个块料的完全老化循环是32小时。
各实施例块料插入市场上可买到的车辆3.5升直接喷射稀燃汽油发动机的排气系统,代替由厂家原来安装的已有底盘NAC。另外,厂家安装的紧耦合三元催化剂替换为申请人的三元催化剂(其已利用前段所述的相同老化循环老化)。车辆在欧洲的MVEG-B循环运行(见图1中的预定车速曲线),排气管NOx排放量记录并表示在图1中。
由图可见,比较例1(标为仅含钡的NAC)的NAC相比比较例2(标为铯盐水溶液)的NAC表现较差,其中可溶性铯也包括在其制造中。然而,可从比较例2和实施例3(标为松散Cs2SiO3)的图形比较看出,实施例3有好得多的结果。这可能是因为在催化剂老化期间,可溶性铯也许已迁移入陶瓷基底整料,从覆盖层到下层蒸发或迁移。当使用制备胶态Cs2SiO3的现场方法时,可见进一步的显著的优点(比较实施例3和4的结果)。
为了避免引起怀疑,此处引用的现有技术文件的全部内容在此合并参考。

Claims (18)

1.NOx存储组分,包含铯硅酸盐(Cs2SiO3)和至少一种铂族金属。
2.如权利要求1所述的NOx存储组分,其中铯硅酸盐和至少一种铂族金属负载在耐火金属氧化物载体上。
3.如权利要求2所述的NOx存储组分,其中耐火金属氧化物载体选自氧化铝、二氧化硅、二氧化钛、氧化锆、氧化铈、氧化镁和其中任意两种或更多种的混合物、混合氧化物或复合氧化物。
4.如权利要求2或3所述的NOx存储组分,其中耐火金属氧化物载体掺杂有一种或多种二氧化硅和稀土元素。
5.如前述任一项权利要求所述的NOx存储组分,其中该或各铂族金属选自铂、钯、铑和其中两种或更多种的混合物。
6.如权利要求1-4中任一项所述的NOx存储组分,其中铂族金属是铑。
7.如前述权利要求任一项所述的NOx存储组分,其中耐火氧化物载体还负载稀土氧化物。
8.如权利要求7所述的NOx存储组分,其中稀土氧化物是氧化铈。
9.如前述权利要求任一项所述的NOx存储组分,包含锰。
10.NOx吸附催化剂,包含设置在基底整料上的如前述任一项权利要求所述的NOx存储组分。
11.如权利要求10所述的NOx吸附催化剂,包含至少一种碱土金属。
12.如权利要求10或11所述的NOx吸附催化剂,包括两个或更多个层,其中铯硅酸盐NOx存储组分设置在第一层并且至少一种碱土金属设置在第二层。
13.如权利要求12所述的NOx吸附催化剂,其中第一层位于第二层上面。
14.如权利要求12或13所述的NOx吸附催化剂,其中铂、钯、或铂和钯两者位于第二层。
15.用于稀燃内燃机的排气系统,包括如权利要求10-14任一项所述的NOx吸附催化剂。
16.汽车,包括如权利要求15所述的排气系统。
17.处理来自稀燃内燃机的含有NOx的排气的方法,该方法包括使含有铯硅酸盐(Cs2SiO3)和至少一种铂族金属的NOx存储组分与含有NOx的贫排气接触以在其上吸附NOx;以及通过使NOx存储组分与化学当量的或富排气接触以周期性地解吸被吸附的NOx的步骤。
18.制造权利要求1-9中任一项所述的NOx存储组分的方法,该方法包括使至少一种铂族金属盐水溶液、铯盐水溶液和二氧化硅源组合并反应的步骤。
CN201180051082.7A 2010-10-22 2011-10-20 NOx存储组分 Active CN103269774B (zh)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB1017870.5 2010-10-22
GB1017870.5A GB2484911B (en) 2010-10-22 2010-10-22 NOx absorber catalyst comprising caesium silicate and at least one platinum group metal
US41355010P 2010-11-15 2010-11-15
US61/413,550 2010-11-15
PCT/IB2011/002517 WO2012052835A1 (en) 2010-10-22 2011-10-20 Nox storage component

Publications (2)

Publication Number Publication Date
CN103269774A true CN103269774A (zh) 2013-08-28
CN103269774B CN103269774B (zh) 2016-06-08

Family

ID=43334243

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201180051082.7A Active CN103269774B (zh) 2010-10-22 2011-10-20 NOx存储组分

Country Status (9)

Country Link
US (1) US8741242B2 (zh)
EP (1) EP2629881B1 (zh)
JP (1) JP5919286B2 (zh)
KR (1) KR20130141533A (zh)
CN (1) CN103269774B (zh)
BR (1) BR112013009654A2 (zh)
GB (1) GB2484911B (zh)
RU (1) RU2601457C2 (zh)
WO (1) WO2012052835A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106675519A (zh) * 2016-12-21 2017-05-17 安徽中创电子信息材料有限公司 一种无机复合磨料及其制备方法
CN107530623A (zh) * 2015-03-03 2018-01-02 巴斯夫公司 具有提高的高温和低温性能的贫NOx捕集

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201220912D0 (en) * 2012-11-21 2013-01-02 Johnson Matthey Plc Oxidation catalyst for treating the exhaust gas of a compression ignition engine
KR101438953B1 (ko) * 2012-12-18 2014-09-11 현대자동차주식회사 저온에서의 NOx 흡장성능이 개선된 LNT촉매
PL3227019T3 (pl) * 2014-12-03 2019-07-31 Basf Se Katalizator rodowy do rozkładu podtlenku azotu, jego wytwarzanie i zastosowanie
CN105888799B (zh) * 2015-02-18 2020-01-17 福特环球技术公司 涉及排气后处理装置的方法
JOP20190088A1 (ar) 2016-10-21 2019-04-21 Us Agriculture نواقل مؤتلفة للتعبير عن مولدات مضاد فيروس انفلونزا الطيور و استخداماتها
GB2557673A (en) * 2016-12-15 2018-06-27 Johnson Matthey Plc NOx adsorber catalyst
KR101971638B1 (ko) * 2017-08-28 2019-04-23 희성촉매 주식회사 비-백금족 NOx 트랩층을 가지는 NOx 트랩 촉매

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1262144A (zh) * 1998-10-13 2000-08-09 底古萨-胡尔斯股份公司 一种氮氧化物储存催化剂
WO2002022241A1 (en) * 2000-09-16 2002-03-21 Johnson Matthey Public Limited Company Nox-trap
CN1353006A (zh) * 2000-11-06 2002-06-12 Omg股份两合公司 选择性催化还原氮氧化物的废气处理装置及其废气处理方法
CN1713946A (zh) * 2002-11-25 2005-12-28 普拉菲尔有限公司 高容量固体过滤介质
CN101069000A (zh) * 2004-07-26 2007-11-07 陶氏环球技术公司 改进的触媒滤烟器
CN101172229A (zh) * 2006-11-01 2008-05-07 比亚迪股份有限公司 用于汽车尾气处理的NOx储存-还原催化剂及其制备方法
WO2009138296A2 (de) * 2008-05-13 2009-11-19 Robert Bosch Gmbh Vorrichtung, system und verfahren zur bereitstellung eines reduktionsmittel für ein system zur selektiven katalytischen reduktion von stickoxiden

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5473887A (en) * 1991-10-03 1995-12-12 Toyota Jidosha Kabushiki Kaisha Exhaust purification device of internal combustion engine
US5451558A (en) 1994-02-04 1995-09-19 Goal Line Environmental Technologies Process for the reaction and absorption of gaseous air pollutants, apparatus therefor and method of making the same
US5874057A (en) 1995-07-12 1999-02-23 Engelhard Corporation Lean NOx catalyst/trap method
GB9805815D0 (en) 1998-03-19 1998-05-13 Johnson Matthey Plc Manufacturing process
US6497848B1 (en) 1999-04-02 2002-12-24 Engelhard Corporation Catalytic trap with potassium component and method of using the same
US20020082164A1 (en) * 2000-01-14 2002-06-27 Danan Dou Methods to reduce alkali material migration from NOx adsorber washcoat to cordierite
FI118326B (fi) * 2000-04-10 2007-10-15 Ecocat Oy Adsorbenttikatalyytti
JP2001314762A (ja) * 2000-05-11 2001-11-13 Ngk Insulators Ltd 排ガス浄化用触媒体
US6617276B1 (en) * 2000-07-21 2003-09-09 Johnson Matthey Public Limited Company Hydrocarbon trap/catalyst for reducing cold-start emissions from internal combustion engines
WO2002038513A1 (en) * 2000-11-07 2002-05-16 Corning Incorporated Pollucite-based ceramic with low cte
US6576587B2 (en) * 2001-03-13 2003-06-10 Delphi Technologies, Inc. High surface area lean NOx catalyst
JP4645786B2 (ja) * 2001-06-08 2011-03-09 三菱自動車工業株式会社 排ガス浄化用触媒
US6727202B2 (en) 2001-08-21 2004-04-27 Engelhard Corporation Enhanced NOx trap having increased durability
US7135429B2 (en) * 2002-05-24 2006-11-14 Ppg Industries Ohio, Inc. Attrition resistant carrier product
US20060035782A1 (en) 2004-08-12 2006-02-16 Ford Global Technologies, Llc PROCESSING METHODS AND FORMULATIONS TO ENHANCE STABILITY OF LEAN-NOx-TRAP CATALYSTS BASED ON ALKALI- AND ALKALINE-EARTH-METAL COMPOUNDS
GB0422549D0 (en) * 2004-10-12 2004-11-10 Johnson Matthey Plc Method of decomposing nitrogen dioxide
US7867598B2 (en) * 2005-08-31 2011-01-11 Ngk Insulators, Ltd. Honeycomb structure and honeycomb catalytic body
JP2007098274A (ja) * 2005-10-04 2007-04-19 Ibiden Co Ltd 多孔質ハニカム構造体及びそれを利用した排ガス浄化装置
WO2007114082A1 (ja) * 2006-03-30 2007-10-11 Ict Co., Ltd. 内燃機関排気ガスの浄化方法
US7576031B2 (en) * 2006-06-09 2009-08-18 Basf Catalysts Llc Pt-Pd diesel oxidation catalyst with CO/HC light-off and HC storage function
WO2008090991A1 (ja) * 2007-01-26 2008-07-31 Cataler Corporation 排ガス浄化用触媒
BRPI0817413A2 (pt) * 2007-12-21 2015-06-16 Dow Global Technologies Inc Catalisador de fuligem, filtro de fuligem catalisador e método para formar um filtro de fuligem catalisador
JP2009165904A (ja) * 2008-01-10 2009-07-30 Honda Motor Co Ltd 排ガス浄化装置
US9358525B2 (en) * 2008-12-04 2016-06-07 Johnson Matthey Public Limited Company NOx storage materials for sensor applications
US8912109B2 (en) * 2008-12-29 2014-12-16 Fina Technology, Inc. Catalyst with an ion-modified binder
US9440192B2 (en) * 2009-01-16 2016-09-13 Basf Corporation Diesel oxidation catalyst and use thereof in diesel and advanced combustion diesel engine systems
KR101189238B1 (ko) * 2010-08-11 2012-10-09 기아자동차주식회사 질소산화물 흡장-환원 촉매, 이의 제조 방법 및 이를 포함하는 질소산화물의 정화 시스템

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1262144A (zh) * 1998-10-13 2000-08-09 底古萨-胡尔斯股份公司 一种氮氧化物储存催化剂
WO2002022241A1 (en) * 2000-09-16 2002-03-21 Johnson Matthey Public Limited Company Nox-trap
CN1353006A (zh) * 2000-11-06 2002-06-12 Omg股份两合公司 选择性催化还原氮氧化物的废气处理装置及其废气处理方法
CN1713946A (zh) * 2002-11-25 2005-12-28 普拉菲尔有限公司 高容量固体过滤介质
CN101069000A (zh) * 2004-07-26 2007-11-07 陶氏环球技术公司 改进的触媒滤烟器
CN101172229A (zh) * 2006-11-01 2008-05-07 比亚迪股份有限公司 用于汽车尾气处理的NOx储存-还原催化剂及其制备方法
WO2009138296A2 (de) * 2008-05-13 2009-11-19 Robert Bosch Gmbh Vorrichtung, system und verfahren zur bereitstellung eines reduktionsmittel für ein system zur selektiven katalytischen reduktion von stickoxiden

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107530623A (zh) * 2015-03-03 2018-01-02 巴斯夫公司 具有提高的高温和低温性能的贫NOx捕集
CN106675519A (zh) * 2016-12-21 2017-05-17 安徽中创电子信息材料有限公司 一种无机复合磨料及其制备方法

Also Published As

Publication number Publication date
JP2013544639A (ja) 2013-12-19
EP2629881A1 (en) 2013-08-28
RU2601457C2 (ru) 2016-11-10
CN103269774B (zh) 2016-06-08
KR20130141533A (ko) 2013-12-26
US20130209337A1 (en) 2013-08-15
GB2484911B (en) 2013-04-03
EP2629881B1 (en) 2014-12-24
BR112013009654A2 (pt) 2016-07-12
GB2484911A (en) 2012-05-02
RU2013123137A (ru) 2014-11-27
WO2012052835A1 (en) 2012-04-26
US8741242B2 (en) 2014-06-03
JP5919286B2 (ja) 2016-05-18
GB201017870D0 (en) 2010-12-01

Similar Documents

Publication Publication Date Title
CN103269774B (zh) NOx存储组分
US9114385B2 (en) NOx absorber catalyst
US9486791B2 (en) NOx trap
US8105559B2 (en) Thermally regenerable nitric oxide adsorbent
JP5661724B2 (ja) 低下された脱硫温度を有する窒素酸化物吸蔵触媒
USRE39553E1 (en) SOx tolerant NOx trap catalysts and methods of making and using the same
JP5144220B2 (ja) 内燃機関の排気浄化装置
CN105683518B (zh) 具有改性贫燃NOx阱的排气系统和方法
JP2009052542A (ja) 排気ガス浄化システム
KR20050100650A (ko) 질소 산화물 트랩 성능을 증진하기 위한 황산화물 트랩 및그 제조 방법 및 용도
US6585945B2 (en) SOx tolerant NOx trap catalysts and methods of making and using the same
EP0935055A2 (en) Device for purifying oxygen rich exhaust gas
US20100204036A1 (en) NOx PURIFYING CATALYST
JPH1147596A (ja) 排気ガス浄化用触媒
US20110197763A1 (en) Material for eliminating oxides of nitrogen with lamellar structure
JP2003135970A (ja) 排気ガス浄化用触媒
WO2004060541A1 (ja) 窒素酸化物を接触還元する方法とそのための触媒
Cooper et al. NO x storage component

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant