Pd(Ⅱ)-Cu(Ⅱ)催化氧化净化PH_3的动力学实验

Kinetics of Pd(Ⅱ)-Cu(Ⅱ) catalytic oxidation of phosphine in aqueous solution

传统的净化方法难以实现低成本、高效、选择性净化含磷化氢尾气,这限制了含磷化氢尾气的资源化技术的实现。文章利用自主筛选的催化剂,在实验室进行了Pd2+浓度、Cu2+浓度、反应温度、混和气氧体积分数、磷化氢质量浓度、混合气流速等因素对Pd(II)-Cu(II)水溶液净化含磷化氢气体影响的研究。实验结果表明,Pd(II)-Cu(II)催化剂在低温(22—73℃)、常压下(100 kPa)对质量浓度为850 mg/m3磷化氢气体净化效率可高达100%。并且催化剂稳定性随催化氧化反应温度的升高而降低,随被净化混和气中氧体积分数、吸收液中Pd2+浓度及Cu2+浓度增大而增强;催化氧化净化效率随混和气中磷化氢质量浓度升高而降低,随被净化的混和气流速降低而升高。

Traditional methods for purifying low concentration phosphine are always cosily or low-efficient, and they limit the resourcelization of gases containing phosphine. The effects of factors such as the concentrations of Pd^2＋ and Cu^2＋ , temperature, the velocity of inflow, volume fraction of oxygen, mass concentration of phosphine on purification efficiency, and the kinetics of Pd（Ⅱ）-Cu（Ⅱ） catalyzed oxidation of phosphine were investigated with selected catalysts. The experimental results show that at low temperature （22-73℃） and normal pressure （ 100 kPa）, the purification efficiency for 850 mg/m^3 of phosphine can reach 100% ; the reactivity and stability of the catalyst are improved with the decreasing of the reaction temperature, and are increased with the increasing of the volume fraction of oxygen, concentrations of Pd^2＋ and Cu^2＋; purification efficiency are improved when decreasing the mass concentration of phosphine and the velocity of inflow.