PtおよびPdを担持した溶媒和抽出剤からの水素化ホウ素ナトリウムによるPtおよびPd微粒子の作成

抄録

The applicability of reductive stripping technique for the preparation of fine particles of Pt and Pd from Pt(II), Pt(IV) and Pd(II)-loaded Organics was investigated. Pt(II), Pt(IV) and Pd(II)-loaded Organics were prepared by extracting the chloro-complex solutions of those metals with TBP or Alamine 336. It was found that the precipitation of those metals from the organic phase containing TBP can be achieved by stripping with an aqueous alkaline solution of NaBH₄, yielding around 1 μm powders. Side reaction of the reductive stripping is an acid decomposition of NaBH₄, and incidently the excess amount of NaBH₄ is required to complete the reductive stripping reaction.
The important parameters to suppress the side reaction are the NaOH concentration in the stripping solution and V_O⁄V_W ratio. Under the experimental conditions employed in this study, it was unable to reduce Pt(II) or Pt(IV)-loaded Alamine 336 organics as far as NaBH₄ was used as a reductant.