Patent ID: 6261991
Filing Date: 2001-07-17
Classification: B01J,C01B,Y02P

Abstract:
In a steam-reforming catalyst for hydrocarbons wherein Ni, as an active component, is supported on an .alpha.-Al.sub.2 O.sub.3 carrier and part of the Ni combined with the carrier to form a NiAl.sub.2 O.sub.4 compound, the improvement comprising carbon being provided in both the Ni active component and the NiAl2O.sub.4 compound by a carbon treatment conducted at 600 to 750.degree. C. for 30 minutes to 5 hours in the presence of steam and C.sub.1-4 lower hydrocarbons, at a molar ratio of steam to carbon in the C.sub.1-4 lower hydrocarbons ranging from 1 to 3, and at least one subsequent oxidation/reduction treatment, wherein the grating constants of the Ni and NiAl.sub.2 O.sub.4 in the catalyst are increased by 0.0001 to 0.0008 nm and 0.001 to 0.005 nm, respectively, as compared to the grating constants of the Ni and NiAl.sub.2 O.sub.4 in the catalyst prior to the provision of carbon therein.