Hydroisomerization catalyst with improved thermal stability
AssigneeChevorn U.S.A. Inc.
InventorsYihua Zhang, Adeola Florence Ojo, Guan-Dao Lei
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Abstract
A method for making a hydroisomerization catalyst having improved thermal stability and metal dispersion characteristics, the catalyst prepared therefrom, and a process for making a base oil product using the catalyst are disclosed. The catalyst is prepared from a composition comprising an SSZ-91 molecular sieve and a rare earth modified alumina, with the composition being modified to contain a Group 8-10 metal, typically through impregnation of a Group 8-10 metal composition. The catalyst may be used to produce dewaxed base oil products by contacting the catalyst under hydroisomerization conditions with a hydrocarbon feedstock.
Claims21
A method for making a hydroisomerization catalyst, which is useful to make dewaxed products including base oils, the method comprising
- mixing an SSZ-91 molecular sieve with a rare earth metal modified alumina and, optionally, a refractory inorganic oxide carrier precursor, to form a mixture, wherein the mixture has an SSZ-91 molecular sieve content in the range of about 5 to about 80 wt. %;
- forming a shaped particulate material from the mixture and drying the particulate material;
- calcining the dried particulate material;
- contacting the calcined particulate material with a solution comprising a Group 8-10 metal compound to form a catalyst precursor material and drying the catalyst precursor material;
- and
- calcining the dried catalyst precursor material to form a hydroisomerization catalyst.
Dependencies are inferred from the claim text.