Control of the product ratio of CO2/(CO+CO2) and inhibition of catalyst deactivation for steam reforming of gasoline to produce hydrogen

Factors controlling the product ratio of CO2/(CO+CO2) and methods for inhibiting deactivation of catalyst for steam reforming of gasoline were studied. Syngas (H2+CO) as major product was produced on Ni-Mo/Al2O3 and the major product on Ni-Re/Al2O3 was H2 and CO2 at the same reaction conditions. Hydrogen with a high CO2/(CO+CO2) ratio of about 92% was produced by coupling reaction of steam reforming and water gas shift on Ni-Re/Al2O3 catalyst at 805 K. The multifunctional activity of the bimetallic catalyst of Ni-Re/Al2O3 and the suitable reaction temperature were of crucial significance for the coupling reaction. Although no deactivation could be observed on both Ni-Mo/Al2O3 and Ni-Re/Al2O3 catalysts for steam reforming of sulfur-free fuels in about 200 h of time on stream, the activity and sulfur-tolerance of Ni-Re/Al2O3 was much better than the values of Ni-Mo/Al2O3 for steam reforming of sulfur-containing fuels because of the unique role of rhenium in the Ni-Re catalyst. The unique role of rhenium in Ni-Re catalyst was mainly because of alloying of rhenium with nickel to form bimetallic Ni-Re sites and interaction of rhenium with sulfur to form S-Re binds. The sulfur-tolerance of Ni-Re/Al2O3 for steam reforming of sulfur-containing gasoline was improved further by addition of a small amount of ZSM-5. The activity and sulfur-tolerance of Ni-Mo/Al2O3 was also enhanced by the addition of ZSM-5.