CN105683518B - 具有改性贫燃NOx阱的排气系统和方法 - Google Patents

具有改性贫燃NOx阱的排气系统和方法 Download PDF

Info

Publication number
CN105683518B
CN105683518B CN201480059179.6A CN201480059179A CN105683518B CN 105683518 B CN105683518 B CN 105683518B CN 201480059179 A CN201480059179 A CN 201480059179A CN 105683518 B CN105683518 B CN 105683518B
Authority
CN
China
Prior art keywords
trap
lean combustion
zeolite
modified
temperature
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.)
Active
Application number
CN201480059179.6A
Other languages
English (en)
Other versions
CN105683518A (zh
Inventor
D·斯瓦洛
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=51585129&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CN105683518(B) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Johnson Matthey PLC filed Critical Johnson Matthey PLC
Publication of CN105683518A publication Critical patent/CN105683518A/zh
Application granted granted Critical
Publication of CN105683518B publication Critical patent/CN105683518B/zh
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • F01N3/18—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 methods of operation; Control
    • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9413—Processes characterised by a specific catalyst
    • B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9481—Catalyst preceded by an adsorption device without catalytic function for temporary storage of contaminants, e.g. during cold start
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts 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
    • B01J23/56—Platinum group metals
    • B01J23/58—Platinum group metals with alkali- or alkaline earth metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts 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
    • B01J23/56—Platinum group metals
    • B01J23/63—Platinum group metals with rare earths or actinides
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20707—Titanium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20723—Vanadium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20738—Iron
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20761—Copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20776—Tungsten
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/50—Zeolites
    • B01D2255/502—Beta zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/50—Zeolites
    • B01D2255/504—ZSM 5 zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes characterised by a specific device
    • 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
    • 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/08—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying ignition or injection timing
    • F01N2430/085—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying ignition or injection timing at least a part of the injection taking place during expansion or exhaust stroke
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

公开了用于处理来自内燃机的排气气体的排气系统。系统包括改性贫燃NOx阱(LNT)、尿素注射系统和氨‑选择性催化还原(NH3‑SCR)催化剂。改性LNT包含铂、钯、钡和含二氧化铈的材料，并且铂:钯摩尔比为至少3:1。改性LNT在低于约200℃的温度下储存NOx并且在高于约200℃的温度下释放储存的NOx。尿素注射系统在高于约180℃的温度下注射尿素。还公开了用于处理来自内燃机的排气气体的方法。

Description

具有改性贫燃NOx阱的排气系统和方法
技术领域
本发明涉及用于处理来自内燃机的排气气体的排气系统，和用于处理来自内燃机的排气气体的方法。
背景技术
内燃机产生包含各种污染物的排气气体，所述污染物包括氮氧化物(“NOx”)、一氧化碳和未燃烧的烃，其是政府立法的对象。排放物控制系统广泛用于降低排放到大气中的这些污染物的量，并且一旦它们达到其操作温度(通常，200℃以上)，其通常实现非常高的效率。然而，这些系统在低于其操作温度(“冷启动”时期)时相对低效。
例如，实施来满足Euro 6b排放的现有的尿素系选择性催化还原 (SCR)应用要求在尿素可以定量加入并且用于转化NOx之前，在尿素定量加入位置处的温度高于约180℃。低于180℃时使用现有的系统难以实现NOx转化，并且未来的欧洲和美国立法将强调低温NOx储存和转化。目前，这是通过加热策略实现的，但是这具有CO2排放物的有害影响。
因为日益严格的国家和地区立法降低了可以从柴油或汽油发动机排放的污染物的量，在冷启动时期期间减少排放物变成很大的挑战。因此，持续探索了用于降低冷启动条件期间释放的NOx水平的方法。
例如，PCT国际申请WO2008/047170公开了这样的系统，其中来自贫燃排气气体的NOx在低于200℃的温度下吸附并且随后在高于 200℃时热解吸。据教导，NOx吸附剂由以下组成：钯和铈氧化物或包含铈和至少一种其它过渡金属的混合氧化物或复合氧化物。
美国申请公开号2011/0005200教导了这样的催化剂系统，其通过将氨-选择性催化还原(“NH3-SCR”)催化剂配制物放置在贫燃NOx阱下游，同时除去氨并且提高净NOx转化率。据教导，NH3-SCR催化剂吸附在贫燃NOx阱中的富燃脉冲期间产生的氨。然后使储存的氨与从上游贫燃NOx阱释放的NOx反应，其增加了NOx转化率，同时耗尽储存的氨。
PCT国际申请WO2004/076829公开了排气-气体纯化系统，其包括布置在SCR催化剂上游的NOx储存催化剂。NOx储存催化剂包括至少一种碱金属、碱土金属或稀土金属，其使用至少一种铂族金属(Pt、 Pd、Rh或Ir)涂覆或活化。特别优选的是，据教导，NOx储存催化剂包括涂覆有铂的铈氧化物和作为基于氧化铝的载体上的氧化催化剂的另外的铂。EP1027919公开了NOx吸附剂材料，其包含多孔载体材料，例如氧化铝、沸石、二氧化锆、二氧化钛和/或氧化镧，和至少0.1wt％的贵金属(Pt、Pd和/或Rh)。例示了氧化铝上负载的铂。
与任何汽车系统和方法类似，期望获得排气气体处理系统的更加进一步的改进，特别是在冷启动条件下。我们已经发现了可以在冷启动时期期间降低NOx排放的系统，同时维持良好的CO氧化活性并且显示出对由硫酸盐化(sulfation)导致的减活的耐受性。
发明内容
本发明是用于处理来自内燃机的排气气体的排气系统。该系统包括改性贫燃NOx阱(LNT)、尿素注射系统和氨-选择性催化还原 (NH3-SCR)催化剂。改性LNT包含铂、钯、钡和含二氧化铈的材料，并且铂:钯摩尔比为至少3:1。改性LNT在低于约200℃的温度下储存NOx并且在高于约200℃的温度下释放储存的NOx。
具体实施方式
本发明为用于处理来自内燃机的排气气体的排气系统。系统包括改性贫燃NOx阱(LNT)。贫燃NOx阱在本领域是公知的。贫燃NOx阱通常设计为在贫燃排气条件下吸附NOx，在富燃条件下释放吸附的NOx，并且还原释放的NOx以形成N2。
LNT通常包括NOx-储存组分、氧化组分和还原组分。NOx-储存组分优选包含碱土金属(例如，钡、钙、锶和镁)、碱金属(例如，钾、钠、锂和铯)、稀土金属(例如，镧、钇、镨和钕)或其组合。这些金属通常见于氧化物形式。通常，包括铂来进行氧化功能并且包括铑来进行还原功能。这些组分包含在一种或多种载体上。
氧化/还原催化剂和NOx-储存组分优选负载在载体材料(例如，无机氧化物)上，以形成用于排气系统的LNT。
本发明的改性LNT设计为具有不同于已知的LNT的功能，不同之处在于它们设计为在低于约200℃的温度下储存NOx并且在高于约 200℃的温度下释放储存的NOx。改性LNT包含铂、钯、钡和含二氧化铈的材料。含二氧化铈的材料优选为二氧化铈、二氧化铈-二氧化锆、二氧化铈-二氧化锆-氧化铝或其混合物。更优选地，含二氧化铈的材料为二氧化铈。
改性LNT的铂:钯摩尔比为至少3:1，更优选大于4:1。
改性LNT还包含钡。可以通过任何已知的方式将钡添加至改性 LNT。例如，可以通过任何已知的方式将钡化合物负载至含二氧化铈的材料或载体材料上，认为添加的方式并不特别关键。例如，可以通过浸渍、吸附、离子交换、初湿含浸法或沉淀等将钡化合物(例如，乙酸钡)添加至含二氧化铈的材料或载体材料上。优选地，改性LNT包含至少150g/ft3的负载量的钡，并且在一些情况下，改性LNT可以包含至少400g/ft3的负载量的钡。
优选地，改性LNT还包含载体。载体优选为无机氧化物，和更优选包括第2、3、4、5、13和14族元素的氧化物。最优选地，载体为氧化铝、二氧化硅、二氧化钛、二氧化锆、氧化镁、氧化铌、钽氧化物、钼氧化物、钨氧化物、其任何两者或更多者的混合氧化物或复合氧化物(例如，二氧化硅-氧化铝、氧化镁-氧化铝)，及其混合物。载体也可以优选包含铈。有用的载体优选具有10-1500m2/g的表面积， 0.1-4mL/g的孔体积，和约10-1000埃的孔径。具有大于80m2/g的表面积的高表面积载体是特别优选的。
本发明的改性LNT在低于约200℃的温度下储存NOx并且在高于约200℃的温度下释放储存的NOx。
改性LNT优选涂覆在基材上。基材优选为陶瓷基材或金属基材。陶瓷基材可以由任何适合的耐火材料制备，所述耐火材料为例如，氧化铝、二氧化硅、二氧化钛、二氧化铈、二氧化锆、氧化镁、沸石、氮化硅、碳化硅、锆的硅酸盐、镁的硅酸盐、铝硅酸盐和金属铝硅酸盐(例如、堇青石和锂辉石)或其任何两者或更多者的混合物或混合氧化物。堇青石、铝硅酸镁和碳化硅是特别优选的。
金属基材可以由任何适合的金属，并且特别是耐热性金属和金属合金(例如钛和不锈钢以及除其他痕量金属之外包含铁、镍、铬和/或铝的铁素体合金)组成。
基材可以为过滤式基材或流通式基材，并且最优选为流通式基材，尤其是蜂窝状整料。基材通常设计为提供多个通道，其中通过汽车排气。通道的表面负载有三元催化剂。
可以通过任何已知的方式将改性LNT添加至基材。例如，优选可以使改性LNT材料作为载体涂层施用并且结合至基材，所述载体涂层为结合至基材表面的多孔高表面积层。载体涂层通常由水基浆料施用至基材，然后在高温下干燥和煅烧。优选地，将改性LNT作为单一的层添加至基材，尽管可以使用另外的层。
本发明的排气系统还包括氨-选择性催化还原(NH3-SCR)催化剂。 NH3-SCR催化剂可以包含任何已知的NH3-SCR催化剂，其在本领域是公知的。NH3-SCR催化剂是通过与氮化合物(例如，氨或尿素)的反应将NOx还原成N2的催化剂。
优选地，NH3-SCR催化剂包含氧化钒-二氧化钛催化剂、氧化钒- 氧化钨-二氧化钛催化剂或金属/沸石。金属/沸石催化剂包含金属和沸石。优选金属包括铁和铜。沸石优选为β沸石、八面沸石(例如，X- 沸石或Y-沸石，包括NaY和USY)、L-沸石、ZSM沸石(例如，ZSM-5、ZSM-48)、SSZ-沸石(例如，SSZ-13、SSZ-41、SSZ-33)、镁碱沸石、丝光沸石、菱沸石、菱钾沸石、毛沸石、斜发沸石、硅质岩、磷酸铝沸石(包括金属铝磷酸盐，例如SAPO-34)、中孔沸石(例如，MCM-41、 MCM-49、SBA-15)或其混合物；更优选地，沸石为β沸石、镁碱沸石或菱沸石。
NH3-SCR催化剂优选涂覆在陶瓷或金属基材上，如上所述。基材通常设计为提供多个管道，其中通过车辆排气，并且通道表面优选涂覆有NH3-SCR催化剂。
用于NH3-SCR催化剂的基材可以为过滤式基材或流通式基材。优选地，NH3-SCR催化剂涂覆在过滤器上，其称为氨-选择性催化还原过滤器(NH3-SCRF)。SCRF为单一基材装置，其组合了NH3-SCR和颗粒过滤器的功能。它们用于减少来自内燃机的NOx和颗粒排放物。
本发明的系统进一步包括尿素注射系统。尿素注射系统优选包括尿素注射器，其将尿素注射至NH3-SCR催化剂上游和改性LNT下游的排气气体物流中。尿素注射系统优选由喷嘴组成，以生产明确限定的尿素溶液液滴。液滴尺寸优选小于500微米，以允许快速蒸发和尿素分解。注射器压力和泵速率是这样的，其允许排气气体物流中的有效混合。
尿素注射系统还优选由以下组成：尿素罐、输送管线和可能的加热系统，以避免尿素溶液的冷冻。
优选地，尿素注射系统在高于约180℃的温度下注射尿素。通常，尿素注射系统构造为在高于约180℃的温度下注射尿素。例如，尿素注射系统可以进一步包括构造为在高于约180℃的温度下注射尿素的处理器，其中处理器电连接至温度传感器。
本发明还包括用于处理来自内燃机的排气气体的方法。该方法包括将排气气体传送在上述改性LNT上。改性LNT在低于约200℃的温度下从排气气体除去氮氧化物(NOx)，并且在高于约200℃的温度下释放NOx。在高于约180℃的温度下，将尿素注射至改性LNT下游的排气气体，和包含从改性LNT释放的NOx的排气气体中并且将尿素传送在NH3-SCR催化剂上。释放的NOx通过在NH3-SCR催化剂上氨 (产生自尿素)与NOx的反应转化成氮。释放的NOx是在低温下储存在改性LNT上并且然后在较高温度下释放的NOx，并且还包括传送在 NH3-SCR催化剂上而没有储存的NOx。
优选地，改性LNT周期性地经受富燃脱硫酸盐化(desulfation)步骤。燃料中硫化合物的存在可能有害于改性LNT，因为硫化合物的氧化在排气气体中产生硫氧化物。在LNT中，二氧化硫可以在铂族金属上氧化成三氧化硫并且在LNT表面上形成表面硫酸盐(例如，氧化物钡或碳酸钡与三氧化硫反应从而形成硫酸钡)。这些硫酸盐比硝酸盐更稳定并且要求更高的温度(>500℃)来脱硫酸盐化。
在富燃脱硫酸盐化中，改性LNT通常在富燃空气:燃料比环境中在经受高于约500℃的温度以实现硫的去除。脱硫酸盐化优选通过增加排气温度通过燃料的后注射进行。脱硫酸盐化策略可以包括单一、连续富燃时期，或串联的短富燃空气:燃料比脉冲。
以下实施例仅仅说明了本发明。本领域技术人员将认识到多种变型可以在本发明的精神和权利要求的范围内。
实施例1：改性LNT的制备
改性LNT 1A(Pt:Pd比＝5:1):
用NOx吸收剂催化剂配制物涂覆400个孔/平方英寸的(cpsi)流通式堇青石基材整料，所述NOx吸收剂催化剂配制物包含单层，所述单层包含1.5g/in3的Ce/铝酸镁尖晶石、3g/in3的颗粒二氧化铈、94g/ft3的Pt和19g/ft3的Pd。使用WO99/47260中公开的方法将载体涂层涂覆在未经涂覆的基材整料上，随后在强制空气干燥器中在100℃下干燥30分钟并且然后在500℃下锻烧2小时。
对比LNT 1B：(Pt:Pd比＝2:1)
根据用于改性LNT 1A的流程制备对比LNT 1B，除了NOx吸收剂催化剂配制物包含单层，所述单层包含53.3g/ft3的Pt和26.6g/ft3的Pd。
实施例2：NOx储存测试
LNT 1A(1.6L催化剂体积)在800℃下水热老化5小时，并且然后在NEDC驱动循环上对1.6升发动机采用低压排气气体再循环(EGR) 进行测试。在测试期间没有采用富燃吹扫。
结果显示改性LNT 1A在最高约200℃下储存约0.5g的NOx，随后在200-300℃下接近完全热释放储存的NOx，显示出本发明的改性 LNT能够用于NH3-SCR系统。
实施例3：脱硫酸盐化测试
LNT 1A和对比LNT 1B经受富燃脱硫酸盐化再生以测试对CO转化率的影响。在重复的贫燃NEDC驱动循环上对1.6升发动机采用低压排气气体再循环(EGR)测试在800℃下水热老化5小时的对比LNT 1B(1.6升催化剂体积)。完成重复的贫燃NEDC循环以评估在延长的贫燃操作情况下的循环CO转化率的劣化。结果显示在表1中。在十个NEDC循环的期间，排气管CO排放从1.3g的CO增加至4.7g的 CO。在第十个贫燃循环之后，使用3秒富燃吹扫对100kph巡航进行串联的三个NEDC循环以再活化催化剂。分析显示一个3秒富燃吹扫足以再活化催化剂，因为排气管CO排放降低至1.8g的CO。再次在 CO减活之后完成进一步的10个仅贫燃NEDC循环，并且在第十个循环时，排气管CO排放增加至5.6g的CO。在第二个NEDC循环之后，以0.95的λ进行500-550℃入口温度脱硫酸盐化10分钟，并且进行第三10-循环NEDC测试。结果显示高温脱硫酸盐化使该LNT对CO转化减活。在第三NEDC循环之后，完成10分钟贫燃DPF再生(在含氧气氛中600℃)。结果显示初始的CO转化率在该再生时未恢复。
相反，本发明的改性LNT 1A在富燃脱硫酸盐化之后显示出良好的CO转化率，其中比较LNT 1B在富燃脱硫酸盐化之后损失了CO 转化率。
表1：排气管CO排放

Claims (12)

1.用于处理来自内燃机的排气气体的排气系统，包括：
(a)改性贫燃NOx阱(LNT)，其中改性贫燃NOx阱包含铂、钯、钡和含二氧化铈的材料并且改性贫燃NOx阱的铂:钯摩尔比为至少3:1，和其中该改性贫燃NOx阱作为单一的层存在于基材上；
(b)尿素注射系统；和
(c)氨-选择性催化还原(NH3-SCR)催化剂，
其中改性贫燃NOx阱在低于约200℃的温度下储存NOx并且在高于约200℃的温度下释放储存的NOx；和
其中所述NH3-SCR催化剂是金属/沸石，其中所述金属/沸石包含：选自铁或铜的金属；和选自β沸石、八面沸石、L-沸石、ZSM沸石、SSZ-沸石、镁碱沸石、丝光沸石、菱沸石、菱钾沸石、毛沸石、斜发沸石、硅质岩、磷酸铝沸石和中孔沸石的沸石。
2.根据权利要求1的排气系统，其中所述尿素注射系统在高于约180℃的温度下注射尿素。
3.根据权利要求1或权利要求2的排气系统，其中所述改性贫燃NOx阱的铂:钯摩尔比为至少4:1。
4.根据权利要求1或权利要求2的排气系统，其中所述改性贫燃NOx阱的钡负载量大于150g/ft3。
5.根据权利要求1或权利要求2的排气系统，其中所述改性贫燃NOx阱的钡负载量大于400g/ft3。
6.根据权利要求1或权利要求2的排气系统，其中所述NH3-SCR催化剂为氨-选择性催化还原过滤器(NH3-SCRF)。
7.根据权利要求6的排气系统，其中所述氨-选择性催化还原过滤器包括过滤器，所述过滤器具有选自氧化钒-二氧化钛催化剂、氧化钒-氧化钨-二氧化钛催化剂和金属/沸石的NH3-SCR催化剂。
8.用于处理来自车辆的内燃机的排气气体的方法，包括：
(a)将排气气体传送在改性贫燃NOx阱(LNT)上以在低于约200℃的温度下从排气气体中除去氮氧化物(NOx)并且在高于约200℃的温度下释放NOx，其中改性贫燃NOx阱包含铂、钯、钡和含二氧化铈的材料并且所述改性贫燃NOx阱的铂:钯摩尔比为至少3:1，和其中该改性贫燃NOx阱作为单一的层存在于基材上；
(b)在高于约180℃的温度下将尿素注射至改性贫燃NOx阱下游的排气气体中；和
(c)将包含从改性贫燃NOx阱释放的NOx的排气气体和尿素传送在NH3-SCR催化剂上以将NOx转化成氮；
其中所述NH3-SCR催化剂是金属/沸石，其中所述金属/沸石包含：选自铁或铜的金属；和选自β沸石、八面沸石、L-沸石、ZSM沸石、SSZ-沸石、镁碱沸石、丝光沸石、菱沸石、菱钾沸石、毛沸石、斜发沸石、硅质岩、磷酸铝沸石和中孔沸石的沸石。
9.根据权利要求8的方法，进一步包括在富燃空气:燃料比环境中周期性地使所述改性贫燃NOx阱经受高于约500℃的温度以除去累积在所述改性贫燃NOx阱上的硫。
10.根据权利要求8或权利要求9的方法，其中所述改性贫燃NOx阱的铂:钯摩尔比为至少4:1。
11.根据权利要求8或权利要求9的方法，其中所述改性贫燃NOx阱的钡负载量大于150g/ft3。
12.根据权利要求8或权利要求9的方法，其中所述改性贫燃NOx阱的钡负载量大于400g/ft3。
CN201480059179.6A 2013-09-16 2014-09-16 具有改性贫燃NOx阱的排气系统和方法 Active CN105683518B (zh)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201361878282P 2013-09-16 2013-09-16
US61/878,282 2013-09-16
PCT/GB2014/052795 WO2015036797A1 (en) 2013-09-16 2014-09-16 EXHAUST SYSTEM WITH A MODIFIED LEAN NOx TRAP

Publications (2)

Publication Number Publication Date
CN105683518A CN105683518A (zh) 2016-06-15
CN105683518B true CN105683518B (zh) 2019-10-18

Family

ID=51585129

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201480059179.6A Active CN105683518B (zh) 2013-09-16 2014-09-16 具有改性贫燃NOx阱的排气系统和方法

Country Status (10)

Country Link
US (2) US10119445B2 (zh)
EP (2) EP3572633A1 (zh)
JP (1) JP2016535203A (zh)
KR (1) KR102277783B1 (zh)
CN (1) CN105683518B (zh)
BR (1) BR112016005657B1 (zh)
DE (1) DE102014113304B4 (zh)
GB (1) GB2520148B (zh)
RU (1) RU2660722C2 (zh)
WO (1) WO2015036797A1 (zh)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6606544B2 (ja) * 2014-08-12 2019-11-13 ジョンソン、マッセイ、パブリック、リミテッド、カンパニー モディファイドリーンＮＯｘトラップを有する排気システム
CN107923286B (zh) * 2015-06-12 2021-08-24 巴斯夫公司 排气处理系统
GB2543337A (en) 2015-10-15 2017-04-19 Johnson Matthey Plc Exhaust System
GB2546745A (en) * 2016-01-26 2017-08-02 Johnson Matthey Plc Exhaust system
DE102017109169A1 (de) 2016-04-29 2017-11-02 Johnson Matthey Public Limited Company Abgassystem
CN106837480B (zh) * 2016-12-26 2019-02-12 潍柴动力股份有限公司 一种基于模型的尿素喷射量控制方法及后处理控制系统
GB201705279D0 (en) * 2017-03-31 2017-05-17 Johnson Matthey Plc Selective catalytic reduction catalyst
US20220152595A1 (en) * 2019-03-20 2022-05-19 Basf Corporation TUNABLE NOx ADSORBER
KR102312320B1 (ko) * 2019-12-02 2021-10-14 한국생산기술연구원 NOx 흡장 기능을 갖는 탈질 촉매 및 그의 제조방법
CN116997402A (zh) 2021-03-18 2023-11-03 巴斯夫公司 用于处理柴油内燃机废气的系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102121412A (zh) * 2009-12-18 2011-07-13 通用汽车环球科技运作有限责任公司 用于柴油发动机的排气后处理系统及方法
CN102132019A (zh) * 2009-09-18 2011-07-20 光星(株) 具有旁路系统的选择性催化剂还原系统
CN102132017A (zh) * 2008-11-13 2011-07-20 丰田自动车株式会社 内燃机排气净化装置
CN102132018A (zh) * 2008-03-03 2011-07-20 丰田自动车株式会社 内燃机的排气净化装置

Family Cites Families (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9805815D0 (en) * 1998-03-19 1998-05-13 Johnson Matthey Plc Manufacturing process
US6182443B1 (en) 1999-02-09 2001-02-06 Ford Global Technologies, Inc. Method for converting exhaust gases from a diesel engine using nitrogen oxide absorbent
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
GB0220645D0 (en) * 2002-09-05 2002-10-16 Johnson Matthey Plc Exhaust system for a lean burn ic engine
US7332135B2 (en) * 2002-10-22 2008-02-19 Ford Global Technologies, Llc Catalyst system for the reduction of NOx and NH3 emissions
DE10308287B4 (de) * 2003-02-26 2006-11-30 Umicore Ag & Co. Kg Verfahren zur Abgasreinigung
US7213395B2 (en) 2004-07-14 2007-05-08 Eaton Corporation Hybrid catalyst system for exhaust emissions reduction
JP4285460B2 (ja) * 2005-08-24 2009-06-24 トヨタ自動車株式会社 内燃機関の排気浄化装置
JP4155320B2 (ja) * 2006-09-06 2008-09-24 トヨタ自動車株式会社 内燃機関の排気浄化装置
GB0620883D0 (en) * 2006-10-20 2006-11-29 Johnson Matthey Plc Exhaust system for a lean-burn internal combustion engine
US20080202101A1 (en) 2007-02-23 2008-08-28 Driscoll James J Exhaust treatment system
JP5683111B2 (ja) 2007-02-27 2015-03-11 ビーエーエスエフ コーポレーション 銅ｃｈａゼオライト触媒
JP2009226349A (ja) * 2008-03-25 2009-10-08 Toyota Motor Corp 排ガス浄化用触媒
DE102008026191B4 (de) 2008-05-30 2020-10-08 Daimler Ag Kraftfahrzeug mit Brennkraftmaschine und einer Abgasnachbehandlungseinrichtung sowie Verfahren zur Partikel- und Stickoxidverminderung
GB2460825A (en) 2008-06-06 2009-12-16 Delphi Tech Inc Reagent dosing system
US8475752B2 (en) 2008-06-27 2013-07-02 Basf Corporation NOx adsorber catalyst with superior low temperature performance
JP2010043583A (ja) * 2008-08-11 2010-02-25 Toyota Motor Corp 内燃機関の排気浄化装置
WO2010082306A1 (ja) 2009-01-13 2010-07-22 トヨタ自動車株式会社 内燃機関の排気浄化装置
US9662611B2 (en) * 2009-04-03 2017-05-30 Basf Corporation Emissions treatment system with ammonia-generating and SCR catalysts
GB2469581A (en) 2009-04-17 2010-10-20 Johnson Matthey Plc Method of using copper/small pore molecular sieve catalysts in a chemical process
KR101536038B1 (ko) * 2009-07-23 2015-07-10 도요타 지도샤（주） 내연 기관의 배기 정화 장치
KR101855537B1 (ko) * 2010-06-10 2018-05-04 바스프 에스이 Rh 로딩량이 감소된 NOx 저장 촉매
JP5937579B2 (ja) * 2010-06-10 2016-06-22 ビーエーエスエフ ソシエタス・ヨーロピアＢａｓｆ Ｓｅ 改善された炭化水素変換活性をもつＮＯｘ貯蔵触媒
US8784759B2 (en) * 2010-06-10 2014-07-22 Basf Se NOx storage catalyst with reduced Rh loading
US9242242B2 (en) * 2010-09-02 2016-01-26 Basf Se Catalyst for gasoline lean burn engines with improved NO oxidation activity
EP3103979B1 (de) 2010-09-13 2018-01-03 Umicore AG & Co. KG Katalysator zur entfernung von stickoxiden aus dem abgas von dieselmotoren
EP2481473A3 (en) 2011-01-26 2012-08-15 Ford Global Technologies, LLC LNT and SCR catalysts for combined LNT-SCR applications
JP5749940B2 (ja) * 2011-03-03 2015-07-15 日本碍子株式会社 排ガス浄化装置
US8524182B2 (en) * 2011-05-13 2013-09-03 Basf Se Catalyzed soot filter with layered design
KR101338068B1 (ko) * 2011-11-28 2013-12-06 현대자동차주식회사 Ｓｄｐｆ 및 그 제조방법
GB2497597A (en) * 2011-12-12 2013-06-19 Johnson Matthey Plc A Catalysed Substrate Monolith with Two Wash-Coats
JP5806131B2 (ja) 2012-01-20 2015-11-10 エヌ・イーケムキャット株式会社 ＮＯｘ吸蔵脱硝触媒
KR101289262B1 (ko) 2012-02-09 2013-07-24 전남대학교산학협력단 일체형 촉매정화장치
GB201220912D0 (en) * 2012-11-21 2013-01-02 Johnson Matthey Plc Oxidation catalyst for treating the exhaust gas of a compression ignition engine
US9333490B2 (en) * 2013-03-14 2016-05-10 Basf Corporation Zoned catalyst for diesel applications
GB2514177A (en) * 2013-05-17 2014-11-19 Johnson Matthey Plc Oxidation catalyst for a compression ignition engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102132018A (zh) * 2008-03-03 2011-07-20 丰田自动车株式会社 内燃机的排气净化装置
CN102132017A (zh) * 2008-11-13 2011-07-20 丰田自动车株式会社 内燃机排气净化装置
CN102132019A (zh) * 2009-09-18 2011-07-20 光星(株) 具有旁路系统的选择性催化剂还原系统
CN102121412A (zh) * 2009-12-18 2011-07-13 通用汽车环球科技运作有限责任公司 用于柴油发动机的排气后处理系统及方法

Also Published As

Publication number Publication date
US20190063287A1 (en) 2019-02-28
BR112016005657A2 (zh) 2017-08-01
RU2016114527A (ru) 2017-10-23
KR102277783B1 (ko) 2021-07-15
WO2015036797A1 (en) 2015-03-19
US20150075140A1 (en) 2015-03-19
RU2016114527A3 (zh) 2018-05-03
US10119445B2 (en) 2018-11-06
GB2520148B (en) 2017-10-18
BR112016005657B1 (pt) 2022-03-29
CN105683518A (zh) 2016-06-15
DE102014113304A1 (de) 2015-03-19
DE102014113304B4 (de) 2017-06-29
JP2016535203A (ja) 2016-11-10
EP3572633A1 (en) 2019-11-27
KR20160055244A (ko) 2016-05-17
EP3047121B1 (en) 2019-07-17
GB201416300D0 (en) 2014-10-29
GB2520148A (en) 2015-05-13
EP3047121A1 (en) 2016-07-27
RU2660722C2 (ru) 2018-07-09

Similar Documents

Publication Publication Date Title
CN105683518B (zh) 具有改性贫燃NOx阱的排气系统和方法
CN104822452B (zh) 基材整料上的区域化的催化剂
RU2570197C1 (ru) Катализатор окисления для обработки выхлопных газов двигателя внутреннего сгорания
KR102353678B1 (ko) 개질된 희박 nox 트랩을 갖는 배기 시스템
US8105559B2 (en) Thermally regenerable nitric oxide adsorbent
JP6134708B2 (ja) 触媒化基材および内燃機関用排気システム
JP5745171B2 (ja) 二元機能触媒フィルター
JP7107937B2 (ja) ＮＯｘ吸着体触媒
JP2018535818A (ja) すす触媒とｓｃｒ触媒を有する触媒フィルタ
KR20160010565A (ko) 압축 점화 엔진을 위한 산화 촉매
JP6775011B2 (ja) 受動的ｎｏｘ吸着体を含む排気システム
CN103619469A (zh) 冷起动催化剂和它在排气系统中的应用
CN109477409A (zh) 用于高发动机输出no2系统的钒催化剂
JP2020515395A (ja) 三層ＮＯｘ吸着体触媒
KR20190132668A (ko) NOx 흡착제 촉매
JP2020515391A (ja) ＮＯｘ吸着体触媒
KR20190132672A (ko) NOx 흡착제 촉매
KR20190004749A (ko) NOx 흡착제 촉매
GB2551671A (en) Exhaust system with a modified lean NOx trap

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant