铜基多相催化剂催化氧气氧化降解水中水合肼

制备了3种铜基多相催化剂,用于催化氧气氧化降解水中水合肼。实验结果表明:三组分催化剂c-CuZnCr比单组分催化剂CuO(c-Cu)和双组分催化剂c-CuZn具有更好的催化性能;在200 mL浓度0.04 mol/L的水合肼水溶液中投加23 mg c-CuZnCr,常温常压下反应360 min,水合肼的降解率达99.96%;c-CuZnCr在使用中稳定性好,循环使用5次未见活性降低。表征结果显示,三组分催化剂具有最大的比表面积,因而表现出最高的催化活性。动力学研究结果表明,c-CuZnCr催化的反应活化能为32.73 kJ/mol,与水合肼浓度和氧气压力相关的反应级数分别为0.97和0.78。

Oxidative degradation of hydrazine hydrate in aqueous solution with oxygen catalyzed by copper-based heterogeneous catalyst

Three copper-based heterogeneous catalysts for oxidative degradation of hydrazine hydrate in aqueous solution with oxygen as oxidant were prepared. The experimental results showed that：the trimetallic catalyst c-CuZnCr exhibited better catalytic performance compared with both the mono-metallic catalyst CuO （c-Cu）and the bimetallic catalyst c-CuZn;and when 23 mg c-CuZnCr was added to 200 mL aqueous hydrazine hydrate with a concentration of 0.04 mol/L,the degradation rate of hydrazine hydrate reached up to 99.96% under atmospheric pressure of oxygen at room temperature after 360 min;in addition,c-CuZnCr showed good stability in the reaction and could be recycled 5 times without any loss of catalytic activity. The characterization results disclosed that the high activity of the trimetallic catalyst was due to its bigger surface area. Kinetic research results indicated that the activation energy of the reaction with c-CuZnCr was 32.73 kJ/mol,and the reaction orders related to hydrazine hydrate concentration and oxygen pressure were 0.97 and 0.78,respectively.