title: Recovery of rare metal compounds from nickel-metal hydride battery waste and their application to CH4 dry reforming catalyst.
abstract: The recovery of valuable components such as nickel from nickel-metal hydride (Ni-MH) battery waste by chemical processes and their applications to CH(4) dry reforming catalysts were investigated. Three types of compound, identified by XRD analysis as NiO, CeO(2) and LaCoO(3) phases, were successfully separated from the waste by a series of chemical processes at room temperature using aqueous solutions of HCl, NaOH and NH(3), and Ni component of approximately 70% in Ni-MH battery waste was recovered. The separated NiO, CeO(2) and LaCoO(3) showed catalytic activities for CH(4) dry reforming. In particular, the separated NiO easily reduced to Ni(0) at an initial stage, and exhibited excellent catalytic activity in terms of CH(4) conversion and stability. Furthermore, it was found that the resulting Ni from separated NiO exhibited an anomalous catalysis from the comparison with that from regent NiO.
authors.affiliation: Department of Material and Energy Science, Graduate School of Environmental Science, Okayama University, Tsushima-Naka, Okayama 700-8530, Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Kanamori
authors.forename: Motohide
authors.initials: M
authors.lastname: Matsuda
authors.forename: Michihiro
authors.initials: M
authors.lastname: Miyake
mesh_terms: D002384:Catalysis; D002563:Cerium / Q000302:isolation & purification; D003035:Cobalt / Q000302:isolation & purification; D003247:Conservation of Natural Resources / Q000379:methods*; D011211:Electric Power Supplies; D007220:Industrial Waste / Q000517:prevention & control*; D007811:Lanthanum / Q000302:isolation & purification; D008670:Metals / Q000302:isolation & purification*; D008697:Methane; D009532:Nickel / Q000302:isolation & purification
chemical_list: D007220:Industrial Waste; D008670:Metals; D002563:Cerium; D003035:Cobalt; C030583:ceric oxide; D007811:Lanthanum; D009532:Nickel; C028007:nickel monoxide; D008697:Methane