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Methods for hydrogenolysis are described which use a Re-containing multimetallic catalyst for hydrogenolysis of both C?O and C?C bonds. Methods and compositions for reactions of hydrogen over a Re-containing catalyst with compositions containing a 6-carbon sugar, sugar alcohol, or glycerol are descr

Methods for hydrogenolysis are described which use a Re-containing multimetallic catalyst for hydrogenolysis of both C?O and C?C bonds. Methods and compositions for reactions of hydrogen over a Re-containing catalyst with compositions containing a 6-carbon sugar, sugar alcohol, or glycerol are described. It has been surprisingly discovered that reaction with hydrogen over a Re-containing multimetallic catalyst resulted in superior conversion and selectivity to desired products such as propylene glycol.

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1. A hydrogenolysis method comprising:reacting a composition with hydrogen, at a temperature of at least 120° C., and in the presence of a solid catalyst; wherein the composition comprises a component selected from the group consisting of: a 6 carbon sugar, a 6 carbon sugar alcohol; and glycerol; an

1. A hydrogenolysis method comprising:reacting a composition with hydrogen, at a temperature of at least 120° C., and in the presence of a solid catalyst; wherein the composition comprises a component selected from the group consisting of: a 6 carbon sugar, a 6 carbon sugar alcohol; and glycerol; and wherein the solid catalyst comprises rhenium and nickel. 2. A hydrogenolysis method comprising:reacting a composition with hydrogen, at a temperature of at least 120° C., and in the presence of a solid catalyst; wherein the composition comprises a 6 carbon sugar, or a 6 carbon sugar alcohol; wherein the solid catalyst comprises a multimetallic catalyst comprising rhenium and at least one member selected from the group consisting of Ni, Pd, Co, Ag, Au, Rh, Pt, Ir, Os, and Cu; and wherein the carbon molar selectivity to PG is at least 30%. 3. The method of claim 2 wherein the multimetallic catalyst comprises nickel.4. The method of claim 3 wherein the method comprises a continuous conversion of a 6-carbon sugar alcohol and the solid catalyst comprises rhenium and nickel.5. The method of claim 4 wherein the PG selectivity is in the range of 30 to 40%.6. A hydrogenolysis method comprising:passing a composition into a reaction chamber; reacting the composition with hydrogen, at a temperature of at least 120° C., and in the presence of a solid catalyst; wherein the composition comprises glycerol and wherein, prior to passing the composition into the reaction chamber, glycerol is present in higher molar concentration than sugars or sugar alcohols; and wherein the solid catalyst comprises a multimetallic catalyst comprising rhenium and at least one member selected from the group consisting of Ni, Pd, Co, Ag, Au, Rh, Pt, Ir, Os, and Cu. 7. A hydrogenolysis method comprising:reacting a composition with hydrogen, at a temperature in the range of 120 to 190° C., and in the presence of a solid catalyst; wherein the composition comprises a component selected from the group consisting of: a 6 carbon sugar, a 6 carbon sugar alcohol; and glycerol; and wherein the solid catalyst comprises a multimetallic catalyst comprising rhenium and at least one member selected from the group consisting of Ni, Pd, Co, Ag, Au, Rh, Pt, Ir, Os, and Cu. 8. The method of claim 7 wherein the method comprises a continuous conversion of a 6-carbon sugar alcohol and the solid catalyst comprises rhenium and nickel.9. The method of claim 8 wherein the 6-carbon sugar alcohol is in aqueous solution and the solid catalyst comprises a carbon support.10. The method of claim 8 wherein the 6-carbon sugar alcohol is in aqueous solution in basic conditions.11. A composition of matter comprising:a solid nickel and rhenium-containing catalyst; water, hydrogen; and a component selected from the group consisting of: a 6 carbon sugar, a 6 carbon sugar alcohol; and glycerol. 12. The composition of claim 11 wherein the solid catalyst comprises a carbon support.13. The composition of claim 11 wherein the water has a basic pH.14. The composition of claim 11 wherein the catalyst contains 0.5 to 2.5 weight % rhenium and 1 to 10 weight % nickel.15. The composition of claim 11 comprising 20 to 50 weight % of said component.16. A method of improving the catalytic activity or selectivity of a supported metal catalyst for the hydrogenolysis of a 6-carbon sugar, 6-carbon sugar alcohol, or glycerol comprising:incorporating rhenium in a nickel-containing metal catalyst to form a rhenium-containing multimetallic metal catalyst; and exposing said sugar or sugar alcohol to said rhenium-containing multimetallic metal catalyst under conditions sufficient to convert at least 40% of said sugar, sugar alcohol, or glycerol to propylene glycol, glycerol, ethylene glycol or any combination thereof; wherein improving means that when tested with a 20 weight % glycerol in aqueous solution with 2 weight % sodium hydroxide, 1200 psi (8.2 MPa) hydrogen in a batch reactor for four hours, the yield of PG is improved by at least 5%, as compared with running the same reaction under the same conditions over each of: the same catalyst without rhenium, the same catalyst without rhenium but containing added weight of metal equal to the weight of rhenium in the improved method, and the same catalyst without rhenium but containing added moles of metal equal to the moles of rhenium in the improved method. 17. A method of improving the reaction of hydrogen with a composition, comprising:exposing the composition to hydrogen in the presence of a solid, multimetallic catalyst comprising rhenium and at least one member selected from the group consisting of Ni, Pd, Co, Ag, Au, Rh, Pt, Ir, Os, and Cu; wherein the composition comprises a component selected from the group consisting of: a 6 carbon sugar, a 6 carbon sugar alcohol, and glycerol; and converting at least 80% of said component to lower molecular weight products including propylene glycol (PG); wherein improving means that at the same conditions where the rhenium-containing multimetallic catalyst results in said at least 80% conversion, the yield of PG is improved by at least 5%, as compared with running the same reaction over each of: the same catalyst without rhenium, the same catalyst without rhenium but containing added weight of metal equal to the weight of rhenium in the improved method, and the same catalyst without rhenium but containing added moles of metal equal to the moles of rhenium in the improved method. 18. A method of hydrogenolysis of an oxygen-containing organic compound, comprising:reacting an aqueous composition with hydrogen at a temperature of at least 120° C., and in the presence of a solid catalyst; wherein the aqueous composition comprises water and an oxygen-containing organic compound, where the solid catalyst comprises nickel and rhenium, and wherein at least 25% as much C?O hydrogenolysis occurs as C?C hydrogenolysis. 19. The method of claim 18 wherein the C?O hydrogenolysis and C?C hydrogenolysis occur simultaneously.20. The method of claim 18 wherein the C?C hydrogenolysis occurs first, base is added, and the C?O hydrogenolysis is then conducted.21. The method of claim 18 wherein the composition comprises a component selected from the group consisting of: a 6 carbon sugar, a 6 carbon sugar alcohol, and glycerol.22. The method of claim 21 wherein the method comprises a continuous conversion of a 6-carbon sugar alcohol.23. The method of claim 21 wherein the reaction occurs in a temperature range of 120 to 190° C.24. A method of hydrogenolysis of an oxygen-containing organic compound, comprising:reacting an aqueous composition with hydrogen in a temperature range of 120 to 190° C., and in the presence of a solid catalyst; wherein the aqueous composition comprises water and an oxygen-containing organic compound, where the solid catalyst comprises a multimetallic catalyst comprising rhenium and at least one member selected from the group consisting of Ni, Pd, Co, Ag, Au, Rh, Pt, Ir, Os, and Cu, and wherein there is at least 25% as much C?O hydrogenolysis occurs as C?C hydrogenolysis. 25. The method of claim 24 wherein the multimetallic catalyst comprises nickel.26. The method of claim 25 wherein the solid catalyst comprises a carbon support.27. A method of making 1,3-propanediol comprising:reacting a composition comprising glycerol with hydrogen at a temperature of at least 120° C., and in the presence of a solid multimetallic catalyst in neutral or acidic conditions, the multimetallic catalyst comprising rhenium and at least one member selected from the group consisting of Ni, Pd, Co, Ag, Au, Rh, Pt, Ir, Os, and Cu. 28. The method of claim 27 wherein the glycerol is in aqueous solution and the selectivity to 1,3-propanediol is at least 2%.29. The method of claim 27 wherein the multimetallic catalyst comprises nickel.30. The method of claim 27 wherein the multimetallic catalyst comprises palladium.31. The method of claim 27 wherein the multimetallic catalyst further comprises Ru.