Pd(II)-Fe(III)液相催化氧化净化磷化氢的研究

Using independently screened Pd(II)-Fe(III) as catalyst for aqueous catalytic oxidation of phosphine and putting forward the catalysis mechanism , the effect of factors such as Pd2+ concentration, Fe2+ concentration, temperature, the velocity of inflow, oxygen concentration and phosphine concentration on phosphine purification efficiency was investigated. The results showed that at lower temperature(22-73℃) and under normal pressure, there existed synergistic effect between Pd(II) and Fe(III) and the purification efficiency of phosphine could keep 100% for more then 150min. In addition, when the oxygen concentration in inflow or Pd(II)-Fe(III) concentration in solution increased, catalysis activity of the catalyst would become more steady. It was also showed that the presumed mechanism could reasonably explain the kinetics characteristics and testified the catalytic oxidation depended on double-oxidation and double-reduction process.