Selective oxidation of glucose on bismuth-promoted Pd-Pt/C catalysts prepared from NOct(4)Cl-stabilized Pd-Pt colloids [Review]

摘要

Charcoal-supported Pd-Pt catalysts based on Pd-Pt/NOct(4)Cl colloidal alloys have superior activity and selectivity in the oxidation of glucose to gluconic acid compared with industrial heterogeneous Pd-Pt catalysts. According to transmission electron microscopy, X-ray diffraction/Debye function analysis, X-ray photoelectron spectroscopy, X-ray absorption near edge structure, and extended X-ray absorption fine structure analysis the chemical coreduction of PdCl2 and PtCl2 in the appropriate ratio with NOct(4)BEt(3)H yielded the alloyed Pd-Pt colloids in organic solvents. They are screened by the lipophilic NOct(4)Cl surfactant layer from coagulation and poisoning. TEM showed colloids of particle sizes in the range from 1.5 to 3 nm. (C) 1998 Elsevier Science S.A. [References: 105]