皮革废水回收DMF工艺中甲酸分解催化剂的制备及性能研究

采用共沉淀法制备甲酸分解催化剂,研究了沉淀、老化、辅助剂、焙烧等条件对催化剂活性的影响。研究结果表明,以醇-水溶液为溶剂,镍锌物质的量比为1∶1.5,柠檬酸为辅助剂,于60℃沉淀、老化4h,在500℃氮气氛围下焙烧4h制备的镍锌复合催化剂,对质量分数为4%的甲酸-DMF溶液中甲酸的分解率可达95.34%。XRD表征结果表明:所制备催化剂为Ni/NiO/ZnO复合催化剂,平均晶粒为40nm。该催化剂用于皮革废水回收DMF工艺中甲酸的分解,效果良好,可用于工业化生产。

Study on preparation and properties of catalysts for formic acid decomposition in recycing DMF from leather wastewater

The catalyst for formic acid decomposition is prepared by co-precipitation method. The influence of various operation condition on catalyst activity is discussed, including precipitation, aging, auxiliary and calcination. The results of the experi- ment show that when multiple Ni/NiO/ZnO catalyst, which is prepared with alcohol-water solution as solvent, nickel-zinc mo- lar ratio of 1 ： 1.5（mol）, citric acid as the auxiliary, precipitation temperature of 60 ℃, aging for 4 h and calcined for 4 h at 500 ℃ in N2, is used for formic acid decomposition in low concentration of formic acid-DMF solution, the decomposition rate is up to 95.34%. The characteristic results by XRD show that the prepared catalyst is Ni/NiO/ZnO multiple catalyst with average size of 40 nm. The catalyst can be used for formic acid decomposition in recycing DMF from leather wastewater.