Preparation and characterization of hydrophobic carbon-supported Pt_3M (M = Fe, Go, Ni and Cr) bimetals for H/D isotope separation between hydrogen and water

摘要

To improve characteristics of hydrophobic catalysts for hydrogen isotope separation between hydrogen and water which is a key reaction for water detritiation and heavy water production, monodispersed Pt_3M bimetal hydrophobic catalysts were fabricated. The average diameters of Pt_3M nanoparticles ranged from 2.2 nm to 2.6 nm. The lattice parameters of Pt_3M were 3.87 A, 3.83 A, 3.78 A and 3.90 A, respectively. All compositions were well-controlled to the similar value. The addition of the metallic Fe, Ni, Cr, and Co hindered the oxidation of the metallic Pt during the preparation of Pt_3M/C catalysts. The catalytic activities for H/D isotope separation increased in the following order: Pt/C ＜ Pt_3Ni/ C ≈ Pt_3CoC ＜ Pt_3Fe/C ＜ Pt_3Cr/C. Catalytic performance tests demonstrated that selection of Pt_3M bimetal is a very effective approach to improve hydrophobic catalytic. Finally, the enhanced activities of Pt_3M bimetals over Pt were discussed by different mechanisms.