Promoted calcium-aluminate supported catalysts for synthesis gas generation
View Patent ↗A promoted calcium-alumina supported reforming catalyst that is particularly useful for reforming reactions where low H 2 /CO ratio synthesis gas, such as less than 2.3 is generated directly is disclosed. The catalyst comprises from about 25 wt % to about 98 wt % alumina, from about 0.5 wt % to about 35 wt % calcium oxide, from about 0.01 wt % to about 35 wt % of a promoter, and from about 0.05 wt % to about 30 wt % of an active metal. The promoter is selected from the group consisting of titanium, zirconium, yttrium, niobium, elements of the lanthanum-series, such as, without limitation, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, ytterbium, and combinations thereof. The active metal is selected from the group consisting of nickel, cobalt, rhodium, ruthenium, palladium, platinum, iridium and combinations thereof as active metal, wherein the calcium oxide is combined with the alumina to form aluminum-rich calcium aluminates.
1. A reforming catalyst for use in a syngas producing process that generates a low H 2 /CO ratio synthesis gas, the catalyst comprising:
a) a support formed from a precursor comprising: from about 25 wt % to about 98 wt % alumina, and from about 0.5 wt % to about 35 wt % calcium oxide, and from about 0.01 wt % to about 35 wt % of a promoter, wherein said promoter is selected from the group consisting of titanium, zirconium, yttrium, niobium, elements of the lanthanum-series, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, ytterbium, and combinations thereof; and
b) from about 0.05 wt % to about 30 wt % of an active metal loaded onto said support, wherein said active metal is selected from the group consisting of nickel, cobalt, rhodium, ruthenium, palladium, platinum, iridium and combinations thereof.
2. The catalyst of claim 1 wherein the calcium oxide combined with the alumina comprises aluminum-rich calcium aluminates.
3. The catalyst of claim 1 wherein the calcium oxide comprises from about 2 wt % to about 20 wt % of the catalyst.
4. The catalyst of claim 1 having a BET surface area greater than about 1.5 m 2 /g.
5. The catalyst of claim 1 having a BET surface area from about 2 m 2 /g to about 30 m 2 /g.
6. The catalyst of claim 1 wherein the active metal is selected from a group consisting of nickel, cobalt and combinations thereof and comprises from about 3 wt % to about 20 wt % of the catalyst.
7. The catalyst of claim 6 having a BET surface area greater than about 4 m 2 /g.
8. The catalyst of claim 6 having a metal specific surface area greater than about 2 m 2 /g.
9. The catalyst of claim 6 having a metal specific surface area greater than about 4 m 2 /g.
10. The catalyst of claim 1 wherein the active metal is selected from a group consisting of rhodium, ruthenium, palladium, platinum, iridium and combinations thereof and comprises from about 0.1 wt % to about 10 wt % of the catalyst.
11. The catalyst of claim 1 having a pore volume greater than about 0.2 cc/g.
12. The catalyst of claim 1 wherein the promoter comprises from about 0.1 wt % to about 25 wt % of the catalyst.
13. A reforming catalyst comprising: a precursor comprising from about 25 wt % to about 98 wt % alumina, and from about 0.5 wt % to about 35 wt % calcium oxide, and from about 0.01 wt % to about 35 wt % of a promoter selected from a group consisting of titanium, zirconium, yttrium, niobium, elements of the lanthanum-series, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, ytterbium, and combinations thereof; and from about 0.05 wt % to about 30 wt % of an active metal selected from a group consisting of nickel, cobalt, rhodium, ruthenium, palladium, platinum, iridium and combinations thereof, wherein said active metal is loaded onto said precursor, and said catalyst having a BET surface area greater than about 3.5 m 2 /g.
14. The catalyst of claim 13 wherein the calcium oxide comprises from about 2 wt % to about 20 wt % of the catalyst.
15. The catalyst of claim 13 wherein the active metal is selected from a group consisting of nickel, cobalt and combination thereof and comprises from about 3 wt % to about 20 wt % of the catalyst.
16. The catalyst of claim 13 wherein the active metal is selected from a group consisting of rhodium, ruthenium, palladium, platinum, iridium and a combination thereof and comprises from about 0.1 wt % to about 10 wt % of the catalyst.
17. The catalyst of claim 13 having a BET surface area from about 4 m 2 /g to about 30 m 2 /g.
18. The catalyst of claim 13 having a pore volume greater than about 0.2 cc/g.
19. A reforming catalyst comprising: a precursor comprising from about 25 wt % to about 98 wt % alumina, and from about 2 wt % to about 20 wt % calcium oxide, and from about 0.01 wt % to about 35 wt % of a promoter selected from a group consisting of titanium, zirconium, yttrium, niobium, elements of the lanthanum-series, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, ytterbium, and combinations thereof; and from about 0.05 wt % to about 30 wt % of an active metal selected from a group consisting of nickel, cobalt, rhodium, ruthenium, palladium, platinum, iridium and combinations thereof, wherein said active metal is loaded onto said precursor, and said catalyst having a BET surface area of from about 4 m 2 /g to about 30 m 2 /g and a pore volume greater than about 0.2 cc/g.
20. The catalyst of claim 19 wherein the active metal is selected from a group consisting of nickel, cobalt and combination thereof and comprises from about 3 wt % to about 20 wt % of the catalyst.
21. The catalyst of claim 19 wherein the active metal is selected from a group consisting of rhodium, ruthenium, palladium, platinum, iridium and a combination thereof and comprises from about 0.1 wt % to about 10 wt % of the catalyst.