Catalyst for paraffin dehydrogenation
AssigneeSabic Global Technologies B.V.
InventorsBiju Maippan Devassy, Rekha Mahadevaiah, Prashant Kumar Raichur Krishtacharya, Vinod Sankaran Nair
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Abstract
Rare earth element containing catalysts for dehydrogenating paraffins and the methods of making the catalysts are disclosed. A rare earth modified alumina support in eta-alumina form, theta-alumina form, or combinations thereof is impregnated with chromium-containing solution. The chromium-impregnated support is then subjected to calcination processes. The produced catalyst contains the rare earth element, chromium, and alumina. The crush strength of the produced catalyst is greater than 0.4 daN/mm.
Claims12
A paraffin dehydrogenation catalyst having improved crush strength produced by a process comprising:
- (a) providing a rare earth element modified alumina support in eta-alumina form comprising a rare earth element-containing compound comprising a rare earth element by:
- (i) providing an eta-alumina support;
- (ii) impregnating the eta-alumina support with a rare earth element compound containing solution to produce a first support;
- and
- (iii) drying the first support and calcining the dried first support to obtain the rare earth element modified alumina support in eta-alumina form;
- (b) impregnating the rare earth element modified alumina support with a chromium-containing solution to produce a second support;
- (c) drying the second support to obtain the third support;
- (d) calcining the third support to obtain the paraffin dehydrogenation catalyst;
- wherein the paraffin dehydrogenation catalyst has a crush strength greater than about 0.4 daN/mm, and further wherein the paraffin dehydrogenation catalyst contains 0.5 to 5 wt. % of a rare earth metal oxide, 30 to 40 wt. % of chromium (III) oxide, 0.1 to 5 wt. % of at least one alkali metal component, and the balance the eta-alumina;
- and wherein the at least one alkali metal component comprises a sodium compound, potassium compound, rubidium compound, cesium compound, or a combination thereof.
A method for producing a paraffin dehydrogenation catalyst, the method comprising the steps of:
- (a) providing a rare earth element modified alumina support in eta-alumina form comprising a rare earth element-containing compound comprising a rare earth element by:
- (i) providing an eta-alumina support;
- (ii) impregnating the eta-alumina support with a rare earth element compound containing solution to produce a first support;
- and
- (iii) drying the first support and calcining the dried first support to obtain the rare earth element modified alumina support in eta-alumina form;
- (b) impregnating the rare earth element modified alumina support with a chromium-containing solution to produce a second support;
- (c) drying the second support to obtain the third support;
- (d) calcining the third support to obtain the paraffin dehydrogenation catalyst;
- wherein the paraffin dehydrogenation catalyst has a crush strength greater than about 0.4 daN/mm,
- wherein the paraffin dehydrogenation catalyst contains 0.5 to 5 wt. % of a rare earth metal oxide, 17 to 40 wt. % of chromium (III) oxide, 0.1 to 5 wt. % of at least one alkali metal component, and the balance the eta-alumina;
- and
- wherein the at least one alkali metal component comprises a sodium compound, potassium compound, rubidium compound, cesium compound, or a combination thereof.
Dependencies are inferred from the claim text.