초록 ▼

The present invention includes an improvement to the existing method of steam reforming of hydrocarbon, wherein the improvement comprises: the flowing is at a rate providing a residence time less than about 0.1 sec resulting in obtaining product formation yield or amount that is the same or greater

The present invention includes an improvement to the existing method of steam reforming of hydrocarbon, wherein the improvement comprises: the flowing is at a rate providing a residence time less than about 0.1 sec resulting in obtaining product formation yield or amount that is the same or greater compared to product formation at a longer residence time. Another improvement of the present invention is operation at a steam to carbon ratio that is substantially stoichiometric and maintaining activity of the supported catalyst. The present invention also includes a catalyst structure for steam reforming of a hydrocarbon.

대표청구항 ▼

1. A catalyst structure, comprising: (a) a first porous structure comprising a first pore surface area and a first pore size of at least 0.1 &mgr;m; (b) a buffer layer upon the first pore surface area; (c) a porous interfacial layer comprising spinel with a second pore surface area and a sec

1. A catalyst structure, comprising: (a) a first porous structure comprising a first pore surface area and a first pore size of at least 0.1 &mgr;m; (b) a buffer layer upon the first pore surface area; (c) a porous interfacial layer comprising spinel with a second pore surface area and a second pore size less than the first pore size; the porous interfacial layer having a thickness less than 4 mm, disposed on the buffer layer; (d) a steam reforming catalyst selected from the group consisting of rhodium, iridium, nickel, palladium, platinum, carbide of group VIb and combinations thereof. 2. The catalyst structure of claim 1 wherein the steam reforming catalyst comprises a carbide selected from the group consisting of tungsten carbide, molybdenum carbide, and combinations thereof.3. The catalyst structure of claim 1 wherein the steam reforming catalyst comprises Rh.4. A steam reforming catalytic system comprising: the catalyst of claim 1; steam and hydrocarbon; and hydrogen. 5. The catalyst structure of claim 1 wherein the spinel comprises Mg and Al.6. The catalyst structure of claim 1 wherein the steam reforming catalyst is selected from the group consisting of rhodium, iridium, nickel, palladium, and platinum and combinations thereof.7. The catalyst structure of claim 6 wherein the catalyst structure has stability such that, when tested in a packed bed at 900° C. for 40 hours, at a steam to carbon ratio of 1:1 and a contact time of 25 msec, no coke deposition is revealed by electron microscopic examination.8. The catalyst structure of claim 1 further comprising a magnesia passivation layer disposed on the spinel.9. The catalyst structure of claim 8 wherein a steam reforming catalyst is impregnated into the magnesia passivation layer.10. The catalyst structure of claim 9 wherein the steam reforming catalyst comprises Rh.11. The catalyst structure of claim 1 made by steps comprising: impregnating an alumina support with a solution of magnesium nitrate; calcining; and, subsequently, a step of impregnating with a catalyst metal. 12. The catalyst structure of claim 11 wherein the step of impregnating with a catalyst metal comprises impregnating with a rhodium nitrate solution.