Heteroatom-doped zeolites for bifunctional catalytic applications
Provided herein are methods for hydroisomerization of a hydrocarbon feedstock comprising contacting the hydrocarbon feedstock with hydrogen and a catalyst to yield a hydrocarbon product having an increase in branched hydrocarbons relative to the hydrocarbon feedstock. The present catalysts comprise a heteroatom-doped Beta zeolite having a trivalent cation as a framework metal oxide, an extra-framework species comprised of cerium and/or cobalt, and from 0.01 to 1.5 wt. % of a group VIII or VIB metal, or a combination thereof.
1. A method for hydroisomerization of a hydrocarbon feedstock comprising contacting the hydrocarbon feedstock with hydrogen and a catalyst to yield a hydrocarbon product having an increase in branched hydrocarbons relative to the hydrocarbon feedstock, wherein the catalyst comprises a heteroatom-doped Beta zeolite having a trivalent cation as a framework metal oxide, an extra-framework species comprised of cobalt, and from 0.01 to 1.5 wt. % of a group VIII or VIB metal, or a combination thereof, the hydrocarbon feedstock comprises C 5 -C 30 normal paraffins and/or C 5 -C 30 monobranched paraffins and the heteroatom-doped Beta zeolite is selective for n-heptane conversion, wherein the catalyst further comprises between 5 wt. % and 25 wt. % tungsten, between 40 wt. % and 70 wt. % zirconium, and a metal oxide binder.
2. The method of claim 1 , wherein the heteroatom-doped Beta zeolite further comprises a molar ratio of SiO 2 to the framework/extra-framework oxide greater than 10.
3. The method of claim 1 , wherein the heteroatom-doped Beta zeolite further comprises a molar ratio of SiO 2 to Al 2 O 3 of greater than 8.
4. The method of claim 1 , wherein the group VIII or VIB metal is Pt.
5. The method of claim 1 , wherein the catalyst comprises 0.1 wt. % to 1.5 wt. % Pt.
6. The method of claim 1 , wherein the hydrocarbon feedstock contacts the catalyst under one or more isomerization conditions.
7. The method of claim/wherein the one or more isomerization conditions comprise a temperature from 100° C. to 450° C., a pressure from 0 psig to 1000 psig, a WHSV from 0.1 hr −1 to 10 hr −1 , and/or a hydrogen/hydrocarbon mole ratio from about 0.1 to about 100.
8. The method of claim 1 , wherein the hydrocarbon feedstock comprises n-pentane, n-hexane, and/or n-heptane.
9. The method of claim 8 , wherein the hydrocarbon feedstock further comprises a naphthene and/or one or more aromatic compounds.
10. A method for hydroisomerization of a hydrocarbon feedstock comprising contacting the hydrocarbon feedstock with hydrogen and a catalyst to yield a hydrocarbon product having an increase in branched hydrocarbons relative to the hydrocarbon feedstock, wherein the catalyst comprises a heteroatom-doped Beta zeolite having a trivalent cation as a framework metal oxide, an extra-framework species comprised of cerium and from 0.01 to 1.5 wt. % of a group VIII or VIB metal, or a combination thereof, the hydrocarbon feedstock comprises C 5 -C 30 normal paraffins and/or C 5 -C 30 monobranched paraffins and the heteroatom-doped Beta zeolite selectively converts C 5 , C 6 and C 7 in the hydrocarbon feedstock.