Loading patent…
AssigneeUop LLC
InventorsTimur V. Voskoboynikov, Daniel H. Wei, J. W. Adriaan Sachtler, Bipin V. Vora
Estimating the term…
A novel catalyst composite is disclosed. Also disclosed is a use for the novel composite. The catalyst composite comprises a Group VIII noble metal component, a Group IA or IIA metal component, and a component selected from the group consisting of tin, germanium, lead, indium, gallium, thallium, or mixtures thereof, all on an alumina support comprising essentially theta-alumina, having a surface area from about 50 to about 120 m2/g, an apparent bulk density of at 0.5 g/cm3 and a mole ratio of the Group VIII noble metal component to the component selected from the group consisting of tin, germanium, lead, indium, gallium, thallium or mixtures thereof in the range from about 1.5 to about 1.7.
A catalytic composite comprising a first component selected from Group VIII noble metal components or mixtures thereof, a second component in an amount from 0.9 to 1.1 weight percent, based on the total composite weight selected from the group consisting of alkali or alkaline earth metal components or mixtures thereof and a third component selected from the group consisting of tin, germanium, lead, indium, gallium, thallium and mixtures thereof, all on an alumina support comprising essentially theta-alumina and having a surface area from about 50 to about 120 m2/g and an apparent bulk density of at least 0.5 g/cm3 wherein the mole ratio of the first component to the third component is in the range from about 1.5 to about 1.7.
A catalytic composite comprising platinum, potassium in an amount from 0.9 to 1.1 weight percent, based on the total composite weight and a third component selected from the group consisting of tin, germanium, lead, indium, gallium, thallium and mixtures thereof, all on an alumina support, the catalytic composite characterized in that the alumina comprises essentially theta-alumina, has a surface area from about 50 to about 120 m2/g, an apparent bulk density of greater than about 0.6 g/cm3 and a platinum to third component mole ratio from about 1.5 to about 1.7.
A hydrocarbon dehydrogenation process comprising the steps of contacting a hydrocarbon at dehydrogenation conditions with a catalytic composite comprising a first component selected from Group VIII noble metal components or mixtures thereof, a second component in an amount from 0.9 to 1.1 weight percent, based on the total composite weight selected from the group consisting of alkali or alkaline earth metal components or mixtures thereof and a third component selected from the group consisting of tin, germanium, lead, indium, gallium, thallium and mixtures thereof, all on an alumina support comprising essentially theta-alumina and having a surface area from about 50 to about 120 m2/g and an apparent bulk density of at least 0.5 g/cm3 wherein the mole ratio of the first component to the third component is in the range from about 1.5 to about 1.7.
A hydrocarbon dehydrogenation process comprising the steps of contacting a hydrocarbon at dehydrogenation conditions with a catalytic composite comprising platinum, a potassium component in an amount from 0.9 to 1.1 weight percent based on the total composite weight and a tin component, all on an alumina support comprising essentially theta-alumina and having a surface are from about 50 to about 120 m2/g and an apparent bulk density of at least 0.5 g/cm3 wherein the mole ratio of the platinum to tin is in the range from about 1.5 to about 1.7.
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
With metals: of the platinum group
Boron or aluminium; Oxides or hydroxides thereof: alumina
Platinum group metals: with gallium, indium, thallium, germanium, tin or lead
Platinum group metals: with alkali- or alkaline earth metals
Term end not estimated
This invention relates to the conversion of hydrocarbons, especially the dehydrogenation of dehydrogenatable hydrocarbons, in the presence of a catalyst composite. This invention also pertains to a new catalyst composite.
The dehydrogenation of hydrocarbons is an important commercial process because of the great demand for dehydrogenated hydrocarbons for the manufacture of various chemical products such as detergents, high octane gasolines, pharmaceutical products, plastics, synthetic rubbers, and other products well known to those skilled in the art. One example of this process is dehydrogenating isobutane to produce isobutylene which can be polymerized to provide tackifying agents for adhesives, viscosity-index additives for motor oils, impact-resistant and anti-oxidant additives for plastics and a component for oligomerized gasoline.
The prior art is cognizant of various catalytic composites which contain a Group VIII noble metal component, an alkali or alkaline earth metal component, and a component selected from the group consisting of tin, germanium, lead, indium, gallium, thallium, or mixtures thereof. However, the prior art has not yet known of a catalyst composite having a surface area of 120 m2/g or less, having an ABD of 0.5 g/cm3 or greater and a mole ratio of the Group VIII noble metal component to the component selected from the group consisting of tin, germanium, lead, indium, gallium, thallium or mixtures thereof in the range from about 1.5 to about 1.7.
The figure is a graph plotting propane conversion versus total is hours on stream comparing two prior art catalysts with the catalyst of the present invention.
To summarize, the present invention is an improved catalytic composite as well as a process for the use of the catalytic composite.
One essential feature of the present invention lies in the characteristics of the support for the instant catalyst. Specifically, it is important that the alumina catalyst support have a surface area of 120 m2/g or less and a corresponding Apparent Bulk Density (ABD) of 0.5 g/cm3 or greater. The support comprises a number of catalytic components including a Group VIII noble metal component, an alkali or alkaline earth component, and a component selected from the group consisting of tin, germanium, lead, indium, gallium, thallium, or mixtures thereof. Another essential feature of the present invention is that the mole ratio of the Group VIII noble metal to the component selected from the group consisting of tin, germanium, lead, indium, gallium, thallium, or mixtures thereof is in the range from about 1.5 to about 1.7. Such a catalyst exhibits improved catalyst conversion in a hydrocarbon dehydrogenation process in comparison to similar dehydrogenation catalysts of the prior art. In addition, it has been discovered that when the preferred mole ratio is used, the catalyst demonstrates a higher initial maximum hydrocarbon dehydrogenation activity.
As indicated above, one essential feature of the catalytic composite of the invention is a first component selected from Group VIII noble metals or mixtures thereof. The Group VIII noble metal may be selected from the group consisting of platinum, palladium, iridium, rhodium, osmium, ruthenium, or mixtures thereof. Platinum, however, is the preferred Group VIII noble metal component.