Additives for removal of metals poisonous to catalysts during fluidized catalytic cracking of hydrocarbons
Compositions and methods suitable for removing poisonous metals from hydrocarbons are provided. The compositions comprise hydrotalcite having one or more trapping metals dispersed on the outer surface thereof.
1. A composition suitable for removing one or more poisonous metals from hydrocarbons, said composition comprising a naturally-occurring or synthetic hydrotalcite having one or more trapping metals dispersed on the outer surface thereof, wherein one or more trapping metals comprises manganese, and a FCC catalyst.
2. The composition of claim 1 , wherein said naturally-occurring or synthetic hydrotalcite has only one trapping metal, wherein said trapping metal is manganese.
3. The composition of claim 1 , wherein said naturally-occurring or synthetic hydrotalcite is prepared from sources selected from the group consisting of an aluminum source and a magnesium source.
4. The composition of claim 3 , wherein the magnesium to aluminum molar ratio is about 1 to about 10.
5. The composition of claim 3 , wherein the magnesium to aluminum molar ratio is about 2 to about 4.
6. A method for removing one or more poisonous metals from hydrocarbons in an FCC unit, the method comprising adding to the FCC unit a naturally-occurring or synthetic hydrotalcite having one or more trapping metals dispersed on the outer surface thereof, wherein said one or more trapping metals comprises manganese.
7. A composition suitable for removing one or more poisonous metals from hydrocarbons, said composition comprising a FCC catalyst and a naturally-occurring or synthetic hydrotalcite having one or more trapping metals dispersed on the outer surface thereof, wherein said naturally-occurring or synthetic hydrotalcite is prepared from sources selected from the group consisting of an aluminum source and a magnesium source, wherein said one or more trapping metals comprises manganese, and wherein the amount of said naturally-occurring or synthetic hydrotalcite having one or more trapping metals ranges from about 1 wt % to about 30 wt % based on the total weight of said FCC catalyst and said naturally-occurring or synthetic hydrotalcite.
8. A composition suitable for removing one or more poisonous metals from hydrocarbons, said composition comprising a FCC catalyst and consisting essentially of naturally-occurring or synthetic hydrotalcite having a trapping metal dispersed on the outer surface thereof, wherein said naturally-occurring or synthetic hydrotalcite is prepared from sources selected from the group consisting of an aluminum source and a magnesium source, wherein said trapping metals is selected from the group consisting of manganese, and wherein the amount of said naturally-occurring or synthetic hydrotalcite ranges from about 1 wt % to about 30 wt % based on the total weight of said FCC catalyst and said naturally-occurring or synthetic hydrotalcite.