Catalyst for the conversion of natural or associated gas into synthesis gas in an autothermal reforming process and method for preparing the same
A catalyst in a calcined state has a specific surface area of 20-50 m 2 /g of catalyst, and a specific surface area of nickel metal after reduction of the catalyst of 8 to 11 m 2 /g, wherein the average particle size of nickel metal is 3-8 nm, the dispersion of the particles is 10-16%, and the content of nickel is 5-15 wt. % based on the weight of calcined catalyst. A support has a specific surface area of 40-120 m 2 /g with a pore volume of the support of 0.2-0.4 cm 3 /g, wherein the support is selected from a mixture of zirconium oxide and cerium oxide or magnesium oxide, cerium oxide and the ballast being zirconium oxide. The catalyst further contains a promoter selected from the group consisting of palladium and ruthenium, in an amount of from 0.01 to 0.5 wt. %. The catalyst is prepared by co-precipitation with ammonium hydroxide from a solution containing nickel, cerium and zirconium precursors and distilled water or from a solution containing nickel, cerium, zirconium, and magnesium precursors and distilled water, and having a pH of 8.0-9.0. The process is carried out under agitation at a temperature of 40-45° C. for 1-2 hours, followed by filtration, drying at a temperature of 100-110° C. for 6-8 hours, and calcining at a temperature of 400-650° C. for 4-6 hours. The invention provides a high average conversion of natural/associated gas of at least 90% in an autothermal reforming reaction of natural or associated gas, and a high synthesis gas output of at least 7000 m 3 /m 3 cat ·h.
1. A catalyst prepared by co-precipitation for the conversion of natural/associated gas to synthesis-gas in an autothermal reforming process, having a specific surface area in a calcined state of 20 to 50 m 2 /g of catalyst and a specific surface area of nickel metal after reduction of the catalyst of 8 to 11 m 2 /g, an average nickel metal particles of 3 to 8 nm, and a dispersion of nickel metal particles within the catalyst of 10 to 16%, the catalyst comprising from 5 to 15 wt. % of nickel based on the weight of the calcined catalyst, and a support having a specific surface area of 40 to 120 m 2 /g and a support pore volume of 0.2 to 0.4 cm 3 /g, wherein the support is selected from a mixture of zirconia and ceria; or magnesium oxide, ceria, and zirconia.
2. The catalyst of claim 1 , further comprising a promoter selected from the group of palladium and ruthenium, in an amount of 0.01 to 0.5 wt. %.
3. A method for preparing a catalyst for the conversion of natural/associated gas to synthesis gas in an autothermal reforming process according to claim 1 by co-precipitating with ammonium hydroxide from a solution comprising nickel, cerium, and zirconium precursors and distilled water or from a solution comprising nickel, cerium, zirconium, magnesium precursors and distilled water and having a pH of 8.0-9.0, under agitation at a temperature of 40-45° C. for 1-2 hours, followed by filtration, drying at a temperature of 100-110° C. for 6-8 hours, and calcining at a temperature of 400-650° C. for 4-6 hours.
4. A catalyst prepared by co-precipitation for the conversion of natural/associated gas to synthesis-gas in an autothermal reforming process, having a specific surface area in a calcined state of 20 to 50 m 2 /g of catalyst and a specific surface area of nickel metal after reduction of the catalyst of 8 to 11 m 2 /g, an average nickel metal particles of 3 to 8 nm, and a dispersion of nickel metal particles within the catalyst of 10 to 16%, the catalyst comprising from 5 to 15 wt. % of nickel based on the weight of the calcined catalyst, and a support having a specific surface area of 40 to 120 m 2 /g and a support pore volume of 0.2 to 0.4 cm 3 /g, wherein the support is selected from a mixture of zirconia and ceria; or magnesium oxide, ceria, and the balance being zirconia, and wherein the catalyst further comprises a promoter selected from the group of palladium and ruthenium, in an amount of 0.01 to 0.5 wt. %, and wherein the conversion is at least 90% with a synthesis gas output of at least 7,000 m 3 /m 3 cat ·h.
5. The catalyst of claim 1 , wherein the conversion is at least 90%.
6. The catalyst of claim 1 , wherein a synthesis gas output of at least 7,000 m 3 /m 3 cat ·h.
7. The catalyst of claim 1 , wherein the support is the mixture of zirconia and ceria.
8. The catalyst of claim 1 , wherein the support is the mixture of magnesium oxide, ceria, and zirconia.