title: Kinetics of Mo, Ni, V and Al leaching from a spent hydrodesulphurization catalyst in a solution containing oxalic acid and hydrogen peroxide.
abstract: The kinetics of molybdenum, nickel, vanadium and aluminium leaching from a spent hydrodesulphurization catalyst in a solution containing oxalic acid and hydrogen peroxide was investigated. The effects of temperature and particle size were examined. In addition, the reaction mechanism for the dissolution of the spent catalyst was discussed. The results of the kinetic analysis for various experimental conditions indicated that the reaction rate of leaching process is controlled by chemical reaction at the particle surface. The values of the activation energies of 31±2, 36±4, 30±4 and 57±3 kJ mol(-1) for Mo, Ni, V and Al, respectively, are characteristic for mechanism controlled by chemical reaction.
authors.affiliation: Chemistry Department, Analytical Chemistry Division, Wroclaw University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland.
authors.forename: Anna
authors.initials: A
authors.lastname: Szymczycha-Madeja
mesh_terms: D000465:Algorithms; D000535:Aluminum / Q000737:chemistry*; D002384:Catalysis; D002614:Chelating Agents / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007202:Indicators and Reagents; D007700:Kinetics; D008982:Molybdenum / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D019815:Oxalic Acid / Q000737:chemistry*; D010316:Particle Size; D012995:Solubility; D012996:Solutions; D013440:Sulfides / Q000737:chemistry*; D013696:Temperature; D014639:Vanadium / Q000737:chemistry*; D014867:Water
chemical_list: D002614:Chelating Agents; D007202:Indicators and Reagents; D012996:Solutions; D013440:Sulfides; D014639:Vanadium; D014867:Water; D009532:Nickel; D008982:Molybdenum; D019815:Oxalic Acid; D006861:Hydrogen Peroxide; D000535:Aluminum