Patents by Inventor Steven Russell LEE

Steven Russell LEE has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of regenerating a deNOcatalyst
    Patent number: 11471831
    Abstract: A method for regenerating a deNOx catalyst includes contacting the catalyst with steam at a temperature in the range of from 250 to 390° C. The method also includes reducing the amount of nitrogen oxide components in a process gas stream that includes a) contacting the process gas with a deNOx catalyst which results in the conversion of nitrogen oxide components as well as a decline in the NOx conversion over the deNOx catalyst; and b) regenerating the deNOx catalyst to improve the NOx conversion by contacting the deNOx catalyst with steam at a temperature in the range of from 250 to 390° C.
    Type: Grant
    Filed: September 25, 2017
    Date of Patent: October 18, 2022
    Assignee: SHELL USA, INC.
    Inventors: Wenzhong Zhang, Geert Marten Bakker, Steven Russell Lee
  • Catalyst and method of use thereof in conversion of NOand NO
    Patent number: 11192097
    Abstract: A catalyst for the conversion of NOX and N2O comprising iron chabazite and iron beta zeolite. A method of simultaneously reducing the NOX and N2O concentration in a process gas stream comprising contacting the process gas stream with a catalyst comprising iron chabazite and iron beta zeolite under conversion conditions.
    Type: Grant
    Filed: July 9, 2018
    Date of Patent: December 7, 2021
    Assignee: SHELL OIL COMPANY
    Inventors: Steven Russell Lee, Wenzhong Zhang, Geert Marten Bakker
  • A CATALYST AND METHOD OF USE THEREOF
    Publication number: 20210362140
    Abstract: A catalyst for the conversion of NOX comprising iron chabazite and iron beta zeolite and a method of reducing the NOX concentration in a process gas stream comprising contacting the process gas stream with the catalyst. The catalyst is especially useful for high temperature deNOX conversion.
    Type: Application
    Filed: July 9, 2018
    Publication date: November 25, 2021
    Inventors: Wenzhong ZHANG, Geert Marten BANKKER, Steven Russell LEE
  • CATALYST AND METHOD OF USE THEREOF IN THE CONVERSION OF NOX AND N2O
    Publication number: 20210178371
    Abstract: A catalyst for the conversion of NOX and N2O comprising iron chabazite and iron beta zeolite. A method of simultaneously reducing the NOX and N2O concentration in a process gas stream comprising contacting the process gas stream with a catalyst comprising iron chabazite and iron beta zeolite under conversion conditions.
    Type: Application
    Filed: July 9, 2018
    Publication date: June 17, 2021
    Inventors: Steven Russell LEE, Wenzhong ZHANG, Geert Marten BAKKER
  • METHOD OF REGENERATING A DENOX CATALYST
    Publication number: 20190240620
    Abstract: The invention provides a method for regenerating a deNOX catalyst comprising contacting the catalyst with steam at a temperature in the range of from 250 to 390° C. The invention further provides a method of reducing the amount of nitrogen oxide components in a process gas stream comprising: a) contacting the process gas with a deNOX catalyst which results in the conversion of nitrogen oxide components as well as a decline in the NOX conversion over the deNOX catalyst; and b) regenerating the deNOX catalyst to improve the NOX conversion by contacting the deNOX catalyst with steam at a temperature in the range of from 250 to 390° C.
    Type: Application
    Filed: September 25, 2017
    Publication date: August 8, 2019
    Inventors: Wenzhong ZHANG, Geert Marten BAKKER, Steven Russell LEE