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    Methods for preparing catalytic systems
    31.
    发明授权
    Methods for preparing catalytic systems 有权

    公开(公告)号：US11376567B2

    公开(公告)日：2022-07-05

    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: B01J21/04 ,  B01J23/10 ,  B01J23/46 ,  B01J23/63 ,  B01J23/72 ,  B01J23/83 ,  B01J35/10 ,  B01J37/02 ,  B01J37/03 ,  B01J37/10 ,  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.

    THREE-WAY CATALYST OXYGEN STORAGE MODEL
    32.
    发明申请
    THREE-WAY CATALYST OXYGEN STORAGE MODEL 审中-公开

    公开(公告)号：US20200182179A1

    公开(公告)日：2020-06-11

    申请号：US16216293

    申请日：2018-12-11

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Gongshin Qi ,  Sergio A. Mendoza Galvis ,  Se H. Oh ,  Min Sun ,  Wei Li ,  Patricia A. Mulawa

    IPC: F02D41/02 ,  F01N3/10 ,  F01N9/00 ,  F02D41/14

    Abstract: Technical methods described herein include an emissions control system for treating exhaust gas from an internal combustion engine in a motor vehicle. The emissions control system includes a three-reaction oxygen storage model. The system further includes a three-way catalyst and a controller that controls an oxygen storage level for the three-way catalyst. The controller determines a first reaction rate representing a net rate of cerium oxidation by oxygen, a second reaction rate representing a net rate of cerium reduction by carbon monoxide, and a third reaction rate representing a net rate of cerium reduction by hydrogen. The controller further determines the oxygen storage level based on the first reaction rate, the second reaction rate, and the third reaction rate.

    METHODS FOR OPERATING AND DIAGNOSING INTERNAL COMBUSTION ENGINE EXHAUST GAS TREATMENT SYSTEMS
    33.
    发明申请
    METHODS FOR OPERATING AND DIAGNOSING INTERNAL COMBUSTION ENGINE EXHAUST GAS TREATMENT SYSTEMS 审中-公开

    公开(公告)号：US20200173327A1

    公开(公告)日：2020-06-04

    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.

    Synergistic combinations of low temperature NOx adsorbers
    38.
    发明授权
    Synergistic combinations of low temperature NOx adsorbers 有权

    公开(公告)号：US10145281B2

    公开(公告)日：2018-12-04

    申请号：US14995441

    申请日：2016-01-14

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Shouxian Ren ,  Gongshin Qi ,  Steven J. Schmieg ,  Wei Li

    IPC: F01N3/00 ,  F01N3/08

    Abstract: Nitrogen oxides (NOx), carbon monoxide (CO), and residual hydrocarbons are adsorbed and stored from a low temperature, cold-start, diesel engine (or lean-burn gasoline engine) exhaust stream by a combination of a silver-based (Ag/Al2O3) NOx adsorber material and a zeolite-platinum group metal (zeolite-PGM) adsorber material for low temperature temporary storage of the NOx. The combination of NOx adsorber materials is formed as separate washcoats on channel walls of an extruded flow-through monolithic support. The monolith is located near the exhaust manifold of the lean burn engine where the combination of NOx adsorber particles temporarily adsorb exhaust constituents, and commence oxidation of them, until the progressively warming exhaust stream removes the stored constituents and carries them through the exhaust pipe to downstream NOx reduction converters which have been heated to their operating temperatures and complete the conversion of the NOx constituents to nitrogen and water for discharge from the vehicle's exhaust system.

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