Chemistry of hydrocarbon compounds – Unsaturated compound synthesis – By dehydrogenation
Reexamination Certificate
2001-03-02
2002-08-13
Dang, Thuan D. (Department: 1764)
Chemistry of hydrocarbon compounds
Unsaturated compound synthesis
By dehydrogenation
C585S661000
Reexamination Certificate
active
06433241
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a catalyst suitable for the selective dehydrogenation of n-butane, a process for the preparation of a catalyst suitable for the selective dehydrogenation of n-butane and the use of this catalyst in a process for the selective dehydrogenation of n-butane.
BACKGROUND OF THE INVENTION
It is known that n-butane can be dehydrogenated to butenes in the presence of variety of catalyst supports impregnated with a variety of metals. The dehydrogenation often produces coke at a rate that spoils the reactivity of the catalyst in a sufficiently short period of time to render the commercial use of the catalysts infeasible. A catalyst composition has newly been found to be useful for selectively dehydrogenating n-butane to butene products without producing coke at a commercially inhibiting rate.
SUMMARY OF THE INVENTION
It is an object of this invention to at least partially dehydrogenate n-butane to butenes.
Another object of this invention is to provide an improved zeolite-based catalyst that can be utilized in the dehydrogenation of n-butane to butenes.
A further object of this invention is to provide a method for making a zeolite-based catalyst that can be utilized in the dehydrogenation of n-butane to butenes.
A still further object of this invention is to accomplish the dehydrogenation of n-butane while minimizing the co-production of coke.
The invention is a zeolite-based catalyst in which an L-type zeolite that has been modified with titania is impregnated with platinum and tin to provide a catalyst composition and a process in which a feedstock containing n-butane is passed in contact with this catalyst composition under selective dehydrogenation conditions to yield butenes as product while minimizing the co-production of coke.
Other objects and advantages of the invention will become apparent from the detailed description and the appended claims.
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Drake Charles A.
Wu An-hsiang
Dang Thuan D.
Phillips Petroleum Company
Stewart Charles W.
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