Catalysts, processes for obtaining and processes for steam reforming
AssigneePetroleo Brasileiro S.A. - Petrobras
InventorRoberto Carlos Pontes Bittencourt
Life of this patent
Estimating the term…
Abstract
The present invention refers to processes for obtaining steam reforming catalysts containing nickel, cerium, lanthanum and copper oxides, free from potassium or alkali metals, preferably with the oxide layer being located externally with a thickness of less than 0.5 mm on the support particle, preferably the support being based on alumina, magnesium aluminate, hexaaluminates or mixtures thereof. The catalysts according to present invention show high activity, resistance to thermal deactivation and resistance to coke accumulation in the steam reforming reaction of hydrocarbons.
Claims19
A steam reforming catalyst comprising:
- a) an inorganic oxide support selected from theta-alumina, magnesium aluminate, hexaaluminates, or a mixture thereof, having a surface area above 15 m2/g;
- and
- b) a mixture of nickel, copper, lanthanum, and cerium oxides, with the total nickel content, expressed as nickel oxide (NiO) between 5 and 25% w/w;
- the copper content expressed as copper oxide (CuO) between 0.5 to 5% w/w, a Ni/(La+Ce) atomic ratio between 3 to 5 and a Ce/AI atomic ratio between 1 to 4;
- wherein the inorganic oxide support comprises cylindrical or sphere-shaped particles.
A steam reforming catalyst comprising:
- a) an inorganic oxide support selected from theta-alumina, magnesium aluminate, hexaaluminates, or a mixture thereof, having a surface area above 15 m2/g;
- and
- b) a mixture of nickel, copper, lanthanum, and cerium oxides, with the total nickel content, expressed as nickel oxide (NiO) deposited on the outside of the support particles at a depth equal to or less than 1 mm, with the content nickel oxide in this layer ranging between 5 and 25% w/w;
- the copper content expressed as copper oxide (CuO) between 0.5 to 5% w/w, a Ni/(La+Ce) atomic ratio ranging between 3 to 5 and a Ce/AI atomic ratio ranging between 1 to 4;
- wherein the inorganic oxide support comprises cylindrical or sphere-shaped particles.
Dependencies are inferred from the claim text.