Rare earth exchanged layered silicate catalysts
AssigneeMobil Oil Corporation
InventorsGarry W. Kirker, Thomas F. Degnan, Jr., Albin Huss, Jr., Michael E. Landis
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Abstract
There is provided a catalyst comprising a layered silicate, such as magadiite, containing interspathic polymeric silica which serves to prop open the layers. The catalyst further comprises rare earth cations which are exchanged with other cations in the silicate. It has been discovered that this rare earth cation exchange imparts enhanced hydrothermal stability to the catalyst. There is also provided a method for making this catalyst and a process for using this catalyst for cracking hydrocarbons. In the cracking process, the catalyst is regenerated.
Claims10
A process for cracking hydrocarbons over a catalyst, wherein said catalyst is regenerated, said process comprising the steps of:
- (i) contacting said hydrocarbons with said catalyst under conditions sufficient to crack said hydrocarbons and to form a deposit of coke on said catalyst;
- (ii) stripping residual hydrocarbons from the coked catalyst of step (i) with steam;
- (iii) removing deposited coke from the stripped catalyst of step (ii) by subjecting said catalyst to sufficient oxidizing condition, whereby coke is oxidized;
- and
- (iv) contacting the regenerated catalyst of step (iii) with more hydrocarbons under conditions sufficient to crack these hydrocarbons;
- wherein said catalyst comprises a layered silicate comprising interspathic polymeric silica, said layered silicate lacking the octahedral sheets of clays, said layered silicate further comprising rare earth metal cations.
Dependencies are inferred from the claim text.