Patents by Inventor Liwen TANG

Liwen TANG 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).

  • Modified ? zeolite, catalytic cracking catalyst and their preparation method and application
    Patent number: 12194445
    Abstract: A modified ? zeolite has 0.5-15 wt % of an IVB group metal element in terms of oxide on the dry basis weight of the modified ? zeolite. The number of medium strong acid centers of the modified ? zeolite accounts for 30-60% of the total acid amount, the number of strong acid centers accounts for 5-25% of the total acid amount, and the ratio of B acid to L acid is 0.8 or more. The ratio of the weight content of the IVB group metal element in the modified ? zeolite body phase to the weight content of the IVB group metal element on the surface is 0.1-0.8. The catalytic cracking catalyst containing the modified ? zeolite has good selectivity and yield of C4 olefin.
    Type: Grant
    Filed: April 29, 2021
    Date of Patent: January 14, 2025
    Assignees: CHINA PETROLEUM & CHEMICAL CORPORATION, RESEARCH INSTITUTE OF PETROLEUM PROCESSING, SINOPEC
    Inventors: Shanqing Yu, Jiasong Yan, Jiexiao Zhang, Liwen Tang
  • Modified Beta Zeolite, Catalytic Cracking Catalyst and Their Preparation Method and Application
    Publication number: 20230166245
    Abstract: A modified ? zeolite has 0.5-15 wt % of an IVB group metal element in terms of oxide on the dry basis weight of the modified ? zeolite. The number of medium strong acid centers of the modified ? zeolite accounts for 30-60% of the total acid amount, the number of strong acid centers accounts for 5-25% of the total acid amount, and the ratio of B acid to L acid is 0.8 or more. The ratio of the weight content of the IVB group metal element in the modified ? zeolite body phase to the weight content of the IVB group metal element on the surface is 0.1-0.8. The catalytic cracking catalyst containing the modified ? zeolite has good selectivity and yield of C4 olefin.
    Type: Application
    Filed: April 29, 2021
    Publication date: June 1, 2023
    Inventors: Shanqing YU, Jiasong YAN, Jiexiao ZHANG, Liwen TANG