| 摘要 |
A method of making a high activity catalyst composition suitable for use in the hydrodesulfurization of a middle distillate feed, such as diesel fuel, having a high concentration of sulfur, to thereby provide a low sulfur middle distillate product. The method comprises heat treating aluminum hydroxide under controlled temperature conditions thereby converting said aluminum hydroxide to gamma-alumina to give a converted aluminum hydroxide, and controlling the fraction of said converted aluminum hydroxide that is gamma-alumina by controlling said controlled temperature conditions to within a calcination temperature range of from 850° F. (454° C.) to 950° C. (510° C.) so that essentially all of said aluminum hydroxide is converted to a transition alumina but less than a material amount of the converted aluminum hydroxide is converted to a transition alumina other than gamma-alumina. A catalytic component is incorporated into said converted aluminum hydroxide to provide an intermediate, which is heat treated to provide said high activity catalyst composition. The high activity catalyst composition can, thus, comprises gamma-alumina and a catalytic component, but having a material absence of aluminum hydroxide and a phase of a transition alumina other than gamma-alumina. Another embodiment of the high activity catalyst composition comprises a support material consisting essentially of gamma-alumina and a catalytic component. The high activity catalyst composition can suitably be used in the hydrodesulfurization of a middle distillate feed containing a high sulfur concentration. |
