The kinetics of diacetyl monoxime(DAM) hydrogenation catalyzed by Pd/PPh\-3 has been studied. The reaction follows the second order kinetics with respect to DAM in the range of investigation, the zeroth order kinetics...The kinetics of diacetyl monoxime(DAM) hydrogenation catalyzed by Pd/PPh\-3 has been studied. The reaction follows the second order kinetics with respect to DAM in the range of investigation, the zeroth order kinetics with respect to H\-2 pressure in optimum reaction conditions, and the first order kinetics with respect to catalyst concentration. The kinetic equation of hydrogenation reaction rate obtained is \{ r =\} k [DAM]\+2[Cat.]. The activation energy for this reaction is E a=50.41 kJ·mol\+\{-1\}. The drawn up mechanism of reaction is in agreement with experimental results.展开更多
文摘本文拟建立二乙酰一肟-氨基硫脲测定游泳池中尿素的方法,从波长的选择、酸度的条件、试剂的加入量、温度的条件、加热时间来寻求最佳条件。结果表明:实验最理想条件是在酸性条件,线性方程结果良好,r=0.999 6,检测波长为480 nm,混合酸溶液加入量为5.00 m L,二乙酰一肟-氨基硫脲溶液加入量为2 m L,加热时间为20 min,线性范围为0~10 mg/L。该方法检测结果良好,可用于游泳池中的尿素测定。
文摘The kinetics of diacetyl monoxime(DAM) hydrogenation catalyzed by Pd/PPh\-3 has been studied. The reaction follows the second order kinetics with respect to DAM in the range of investigation, the zeroth order kinetics with respect to H\-2 pressure in optimum reaction conditions, and the first order kinetics with respect to catalyst concentration. The kinetic equation of hydrogenation reaction rate obtained is \{ r =\} k [DAM]\+2[Cat.]. The activation energy for this reaction is E a=50.41 kJ·mol\+\{-1\}. The drawn up mechanism of reaction is in agreement with experimental results.