Catalytic Performance Of Goethite Support Ni For The Catalytic Cracking Of Toluene As A Model Compound Of Tar

The thermal structual evolution of systhetic goethite calcined under airatmosphere at different temperatures was studied in this paper. Based on the change ofsurface area, pore volume for the thermal treatment of systhetic goethite, alaboratory-scale fixed-bed reactor was estibalished for catalytic cracking of toluene asa model compound of biomass tar. The effect of reaction temperature, gas hourlyspace velocity(GHSV) and Ni loadings for the catalytic cracking were investigated inthis paper, and magnetic reclaim was applied for the solid products. Repeated testswere studied for the performance assessment of catalysts in the catalytic cracking oftoluene.(1) The dehydroxylation of systhetic goethite occurs to form hematite at200oC,whilethe phase transition completes at250oC. This is ascribed to the dehydration ofgoethite, and the maximum specific surface area is97.4m2/g.(2) The toluene removal improved with the increasing reaction temperature, on theother hand, the catalytic activity declined over the reaction time. The XRD resultsshowed that the product of hematite transformed into magnetite,and an obvious effectof magnetic reclaim forsolid products was obtained.(3) The stability of toluene removal imporved with the increasing of Ni loading, andthe highest catalytic activity was obtained at8%Ni. The gas hourly spacevelocity(GHSV) had a great impact on toluene removal, and toluene removal reached100%when the GHSV was3774h-1. The Fe0.925O reflection was identified when thereaction temperature exceeded700oC.(4) Three times repeated tests showed that the toluene removal reached100%at thefirst test, however, the catalytic activity declined at the second and third test with the80%toluene removal.