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US 12,121,887 B2Granted
Method of preparation of dehydrogenation catalyst with high chromium content
AssigneeSabic Global Technologies B.V.
InventorsBiju Maippan Devassy, Rekha Mahadevaiah, Prashant Kumar Raichur Krishtacharya, Vinod Sankaran Nair
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Abstract
A method for the dehydrogenation of lower alkanes is disclosed. The method employs a chromium-alumina dehydrogenation catalyst with high chromium content supported on eta-alumina. The catalyst contains greater than 25 percent by weight chromium in the form of chromium (III) oxide, and exhibits extended stability over traditional alkane dehydrogenation catalysts.
Claims14
A dehydrogenation catalyst produced by a process comprising:
- (a) preparing a heat-treated eta-alumina support by heat-treating an eta-alumina having a surface area in the presence of a steam and air mixture to form the heat-treated eta-alumina support;
- (b) impregnating the heat-treated eta-alumina support with a solution comprising at least one dissolved chromium compound and a promoter to yield an impregnated support;
- (c) drying and calcining said impregnated support to yield a calcined impregnated support containing less than 30 wt. % chromium (III) oxide based on the total weight of the calcined impregnated support;
- (d) performing one or more additional cycles comprising each of the impregnating step, the drying step, and the calcining step to yield a dehydrogenation catalyst containing only the eta-alumina support, the promoter, and from 25 wt. % to about 40 wt. % chromium (III) oxide based on the weight of the dehydrogenation catalyst;
- wherein the promoter is selected from the group consisting of an alkali metal oxide, an alkaline earth metal oxide, a transition metal oxide and a rare earth metal oxide, and combinations of two or more thereof;
- and
- wherein a water pore volume of the heat-treated eta-alumina support is more than 0.35 cm3/g.
4 more elements
A dehydrogenation catalyst comprising:
- (a) a heat-treated eta-alumina support impregnated with chromium (III) oxide and a promoter,
- wherein the dehydrogenation catalyst comprises from 25 wt. % to about 40 wt. % of the chromium (III) oxide based on the weight of the dehydrogenation catalyst;
- wherein the promoter is selected from the group consisting of an alkali metal oxide, an alkaline earth metal oxide, a transition metal oxide and a rare earth metal oxide, and combinations of two or more thereof;
- wherein a water pore volume of the heat-treated eta-alumina support is more than 0.35 cm3/g;
- wherein the heat-treated eta-alumina support is prepared by heat-treating eta-alumina having a surface area in the presence of a steam and air mixture to form the heat-treated-eta-alumina support.
2 more elements
Dependencies are inferred from the claim text.