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    METHODS FOR PREPARING CATALYTIC SYSTEMS
    61.
    发明申请
    METHODS FOR PREPARING CATALYTIC SYSTEMS 有权

    公开(公告)号：US20210170368A1

    公开(公告)日：2021-06-10

    申请号：US16704092

    申请日：2019-12-05

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Ming Yang ,  Se H. Oh ,  Gongshin Qi ,  Wei Li

    IPC: B01J23/63 ,  B01J21/04 ,  B01J23/10 ,  B01J23/46 ,  B01J23/72 ,  B01J23/83 ,  B01J37/02 ,  B01J37/03 ,  B01J37/10 ,  B01J35/10 ,  B01D53/94

    Abstract: Methods for preparing catalytic systems include passivating a gamma-phase alumina support body to yield a theta-phase alumina support body and applying catalytic metal to passivated theta-phase alumina support body. Passivating can include heating, optionally in the presence of steam. The gamma-phase alumina can be lanthanum-doped gamma-phase alumina and can be about 0.1-55 wt. % lanthanum. The catalytic metal can include rhodium, copper, or nickel. The catalytic metal can be rhodium or nickel, and the catalytic metal can be applied to the passivated theta-phase alumina support body at a loading of about 0.1-10 wt. %. The catalytic metal can be copper, and the catalytic metal can be applied to the passivated theta-phase alumina support body at a loading of about 0.1-30 wt. %. The gamma-phase alumina support body can be at least about 90 wt. % gamma-phase alumina. The passivated theta-phase alumina support body can be at least about 80 wt. % theta-phase alumina.

    Methods for operating and diagnosing internal combustion engine exhaust gas treatment systems
    62.
    发明授权
    Methods for operating and diagnosing internal combustion engine exhaust gas treatment systems 有权

    公开(公告)号：US10907521B2

    公开(公告)日：2021-02-02

    申请号：US16206021

    申请日：2018-11-30

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Shouxian Ren ,  Gongshin Qi ,  Rahul Mital ,  Anirban Sett

    IPC: F01N3/20 ,  F01N3/10 ,  F02D41/02 ,  B01D53/94

    Abstract: Internal combustion engine (ICE) exhaust gas treatment systems include the ICE having one or more cylinders configured to receive a mixture of air and fuel defined by an air to fuel ratio (AFR) for combustion therein, a control module configured to control the AFR, a diesel oxidation catalyst (DOC) configured to receive exhaust gas generated by the ICE and oxidize NOx species within the exhaust gas, and a selective catalytic reduction device (SCR) configured to receive exhaust gas from the DOC. Methods for operating and diagnosing such systems include determining, via the control module, a baseline value of a SCR performance parameter which is unsuitable, changing, via the control module, the AFR to change the DOC outlet NO2:NOx ratio, subsequently assessing a second value of the SCR performance parameter, and implementing a control action based on the second value of the SCR performance parameter.

    Method for diagnosing and controlling ammonia oxidation in selective catalytic reduction devices
    65.
    发明授权
    Method for diagnosing and controlling ammonia oxidation in selective catalytic reduction devices 有权

    公开(公告)号：US10690079B2

    公开(公告)日：2020-06-23

    申请号：US15838860

    申请日：2017-12-12

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Michael A. Smith ,  Sarah Funk ,  David E. Edwards ,  Min Sun ,  Gongshin Qi

    IPC: F02D41/14 ,  B01D53/94 ,  F01N3/10 ,  F01N3/20 ,  F01N11/00

    Abstract: An emissions control system for treating exhaust gas containing NOx emissions from an internal combustion engine comprises a selective catalytic reduction (SCR) device that stores reductant that reacts with the NOx emissions, a reductant supply system configured to inject the reductant according to a reductant storage model; NOx module(s) configured to generate an NOx concentration signal indicating an NOx concentration, temperature module(s) configured to generate a temperature signal indicating an SCR temperature of the SCR device, and a control module operably connected to the reductant supply system, the NOx module, and the temperature module. The control module is configured to determine an amount of the reductant that is parasitically oxidized based on the NOx concentration signal and the temperature signal, and to determine a correction factor based on the amount of parasitically oxidized reductant to modify the reductant storage model.

    SINTER-RESISTANT CATALYST SYSTEMS
    66.
    发明申请
    SINTER-RESISTANT CATALYST SYSTEMS 审中-公开

    公开(公告)号：US20200047159A1

    公开(公告)日：2020-02-13

    申请号：US16056973

    申请日：2018-08-07

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Xingcheng Xiao ,  Ming Yang ,  Gongshin Qi ,  Wei Li

    IPC: B01J23/44 ,  B01J23/10 ,  B01J33/00 ,  B01J35/00 ,  B01D53/94

    Abstract: Sinter-resistant catalyst systems include a catalytic substrate comprising a plurality of metal catalytic nanoparticles bound to a metal oxide catalyst support, and a coating of oxide nanoparticles disposed on the metal catalytic nanoparticles and optionally on the metal oxide support. The oxide nanoparticles comprise one or more lanthanum oxides and optionally one or more barium oxides, and additionally one or more oxides of aluminum, cerium, zirconium, titanium, silicon, magnesium, zinc, iron, strontium, and calcium. The metal catalytic nanoparticles can include ruthenium, rhodium, palladium, osmium, iridium, and platinum, rhenium, copper, silver, and/or gold. The metal oxide catalyst support can include one or more metal oxides selected from the group consisting of Al2O3, CeO2, ZrO2, TiO2, SiO2, La2O3, MgO, and ZnO. The coating of oxide nanoparticles is about 0.1% to about 50% lanthanum and barium oxides. The oxide nanoparticles can further include one or more oxides of magnesium and/or cobalt.

    Method For Diagnosing And Controlling Ammonia Oxidation In Selective Catalytic Reduction Devices
    69.
    发明申请
    Method For Diagnosing And Controlling Ammonia Oxidation In Selective Catalytic Reduction Devices 审中-公开

    公开(公告)号：US20190178187A1

    公开(公告)日：2019-06-13

    申请号：US15838860

    申请日：2017-12-12

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Michael A. Smith ,  Sarah Funk ,  David E. Edwards ,  Min Sun ,  Gongshin Qi

    IPC: F02D41/14 ,  F01N11/00 ,  F01N3/20 ,  F01N3/10 ,  B01D53/94

    Abstract: An emissions control system for treating exhaust gas containing NOx emissions from an internal combustion engine comprises a selective catalytic reduction (SCR) device that stores reductant that reacts with the NOx emissions, a reductant supply system configured to inject the reductant according to a reductant storage model; NOx module(s) configured to generate an NOx concentration signal indicating an NOx concentration, temperature module(s) configured to generate a temperature signal indicating an SCR temperature of the SCR device, and a control module operably connected to the reductant supply system, the NOx module, and the temperature module. The control module is configured to determine an amount of the reductant that is parasitically oxidized based on the NOx concentration signal and the temperature signal, and to determine a correction factor based on the amount of parasitically oxidized reductant to modify the reductant storage model.

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