Nickel supported on titanium stabilized promoted calcium aluminate carrier
View Patent ↗A calcium-promoted alumina supported nickel reforming catalyst stabilized with titanium is disclosed. The catalyst is particularly useful for reforming reaction in feed streams containing significant quantities of CO and CO 2 , low quantities of steam (the feed stream having a H 2 O/CH 4 of less than 0.8 and a CO 2 /CH 4 of greater than 0.5) and relatively high quantities of sulfur compounds (up to about 20 ppm). The catalyst comprises from about 25 wt % to about 98 wt % alumina as a support, from about 2 wt % to about 40 wt % nickel oxide, which is promoted with from about 0.5 wt % to about 35 wt % calcium oxide, and which is stabilized with from about 0.01 wt % to about 20 wt % titanium, wherein the calcium oxide is combined with the alumina to form calcium aluminate. The catalyst can be used in reforming reactions to produce syngas and has advantages in producing low hydrogen to carbon monoxide ratio syngas for applications such as iron ore reduction.
1. A reforming catalyst for use in feed streams containing steam, CO 2 , and CO at levels such that the H 2 O/CH 4 is less than 0.8 and the C 2 O/CH 4 is greater than 0.5, the feed stream further containing relatively high quantities of sulfur compounds, wherein said catalyst comprises from about 0.5 wt % to about 25 wt % of a calcium compound additive, from about 2 wt % to about 30 wt % nickel, from about 25 wt % to about 98 wt % of an aluminum compound carrier, and from 0.01 wt % to 20 wt % of titanium, and wherein said catalyst has a pore volume greater than about 0.2 cc/g.
2. The catalyst of claim 1 wherein the calcium compound combined with the aluminum compound comprises calcium aluminate.
3. The catalyst of claim 1 wherein the amount of free calcium oxide present in the catalyst is not detectable by x-ray diffraction.
4. The catalyst of claim 1 wherein the calcium compound comprises from about 2 wt % to about 16 wt % of the catalyst.
5. The catalyst of claim 1 wherein the nickel comprises from about 2 wt % to about 20 wt % of the catalyst.
6. The catalyst of claim 1 having a BET surface area greater than about 4 m 2 /g.
7. The catalyst of claim 1 having a BET surface area from about 6 m 2 /g to about 30 m 2 /g.
8. The catalyst of claim 1 having a nickel specific surface area greater than about 2 m 2 /g.
9. The catalyst of claim 1 having a nickel specific surface area greater than about 4 m 2 /g.
10. The catalyst of claim 1 wherein the titanium comprises from 0.1 wt % to 10 wt % of the catalyst.