Patents Represented by Attorney Alexander J. McKilloo

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  • Catalytic conversion over dehydroxylated zeolite
    Patent number: 4790928
    Abstract: The acidity of a zeolite catalyst is reduced by calcination in an essentially water-free atmosphere at temperatures above 700.degree. C., preferably from 725.degree. to 800.degree. C., to reduce the alpha value to less than about 10 percent of its original value. The low acidity catalysts produced in this way may be used for conversions requiring low acidity, shape selective catalysis, including dewaxing. The calcined, low acidity catalysts exhibit improved dewaxing activity.
    Type: Grant
    Filed: February 8, 1988
    Date of Patent: December 13, 1988
    Assignee: Mobile Oil Corporation
    Inventors: Clarence D. Chang, Nai Y. Chen, Stuart D. Hellring, Ying-Yen P. Tsao, Dennis E. Walsh
  • Crystalline silicate zeolite beta of improved stability
    Patent number: 4789656
    Abstract: A process is described for preparing a binder-free Zeolite Beta containing catalyst which has a highly dispersed noble metal incorporated into the framework. The process comprises steaming Zeolite Beta, followed by noble metal incorporation and calcination. The present invention is also directed to an improved calcination process.
    Type: Grant
    Filed: July 2, 1987
    Date of Patent: December 6, 1988
    Assignee: Mobil Oil Corporation
    Inventors: Nai Y. Chen, Sharon B. McCullen