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    Methods for preparing catalytic systems
    5.
    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
    6.
    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.

    Platinum-containing catalyst systems
    8.
    发明授权
    Platinum-containing catalyst systems 有权

    公开(公告)号：US10926245B1

    公开(公告)日：2021-02-23

    申请号：US16547100

    申请日：2019-08-21

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

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

    IPC: B01D53/94 ,  B01J23/42 ,  B01J33/00 ,  F01N3/10

    Abstract: The present disclosure provides a method for operating a three-way catalyst system at high temperatures. The method includes passing a high-temperature exhaust stream exiting an engine over a thermally stable three-way catalyst system including a metal oxide support; two or more catalytically active metals disposed on the support; and a porous metal oxide coating disposed on one or more exposed surfaces of the support. At least one of the catalytically active metals may be platinum (Pt). The method further includes reducing an amount of the nitrogen oxides (NOx), carbon monoxide (CO), and non-methane hydrocarbons (HCs) in an effluent stream exiting the thermally stable three-way catalyst system so that the effluent stream has a combined amount of nitrogen oxides (NOx) and non-methane hydrocarbons (HCs) of less than or equal to about 30 mg/mile and less than or equal to about 0.5 g/mile of carbon monoxide (CO).

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