Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Patent
1995-09-25
2000-01-18
Griffin, Walter D.
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
208108, 208135, 208143, 208216R, 208216PP, 208217, 208251H, 208254H, 502300, 502305, 502313, 502314, 502315, 502316, 502210, 502213, C10G 4702, C10G 3506, C10G 4504, B01J 2104
Patent
active
060154853
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to high activity catalysts based upon gamma alumina containing substrates impregnated with one or more catalytically active metals, processes for preparing the same and uses thereof. More specifically, the present invention relates to process for improving the activity of such catalysts, the improved activity catalysts produced thereby, and various specific catalysts and uses thereof.
2. Description of Related Art
The art relating to particulate porous gamma alumina containing supports, impregnating such supports with various catalytically active metals, metal compounds and/or promoters, and various uses of such impregnated supports as catalysts, is extensive and relatively well developed. As a few of the many exemplary disclosures relating to these fields may be mentioned the following United States patents, all of which are incorporated herein by reference for all purposes as if fully set forth U.S. Pat. Nos. 2,935,463, 3,032,514, 3,124,418, 3,152,865, 3,232,887, 3,287,280, 3,297,588, 3,493,493, 3,749,664, 3,778,365, 3,897,365, 3,909,453, 3,983,197, 4,090,874, 4,090,982, 4,154,812, 4,179,408, 4,255,282, 4,328,130, 4,357,263, 4,402,865, 4,444,905, 4,447,556, 4,460,707, 4,530,911, 4,588,706, 4,591,429, 4,595,672, 4,652,545, 4,673,664, 4,677,085, 4,732,886, 4,797,196, 4,861,746, 5,002,919, 5,186,818, 5,232,888, 5,246,569 and 5,248,412.
While the prior art shows a continuous modification and refinement of such catalysts to improve their catalytic activity, and while in some cases highly desirable activities have actually been achieved, there is a continuing need in the industry for even higher activity catalysts, which are provided by the present invention.
As an example of this need may be mentioned the need for a higher activity first stage hydrocracking catalyst. In a typical hydrocracking process, higher molecular weight hydrocarbons are converted to lower molecular weight fractions in the presence of a hydrocracking catalyst which is normally a noble metal impregnated silica-alumina/zeolite. State-of-the-art hydrocracking catalysts possess a very high activity and are capable of cracking high volume throughputs. Such catalysts, however, are highly sensitive to contaminants such as sulfur, metals and nitrogen compounds, which consequently must be removed from the hydrocarbon stream prior to the cracking. This is accomplished in first stage hydrocracking processes such as hydrodenitrogenation, hydrodesulfurization and hydrodemetallation. Hydrotreating catalysts utilized in these processes are typically a combination Group VIB and Group VIII metal impregnated alumina substrate. State-of-the-art hydrotreating catalysts, however, are not sufficiently active to allow processing of the same high volume throughputs as can be processed by the hydrocracking catalysts. As such, the first stage hydrocracking processes form a bottleneck in the overall hydrocracking process, which must be compensated, for example, in the size of the hydrotreating unit relative to the hydrocracking unit.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a high activity catalyst composition comprising, in one aspect, a particulate porous support containing gamma alumina, having a surface area of at least 100 square meters (as measured by nitrogen adsorption) and a pore volume of at least 0.25 cubic centimeters per gram (as measured by mercury porosimetry), and impregnated with one or more catalytically active metals, whereby the catalyst further contains in part a nanocrystalline phase of alumina of a crystallite size at the surface of up to 25 .ANG..
In another aspect, the present invention provides a high activity catalyst comprising a particulate porous support containing gamma alumina, having a surface area of at least 100 square meters (as measured by nitrogen adsorption) and a pore volume of at least 0.25 cubic centimeters per gram (as measured by mercury porosimetry), and impregnated with one or mo
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Carruthers James Donald
Lostaglio Vincent Joseph
Shukis Peter Joseph
Cytec Technology Corporation
Griffin Walter D.
Kelly Michael J.
Lerman Bart E.
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