沉淀剂对CuO超细粉体形态与性能的影响

Effect of precipitant on the morphology and performances of ultrafine powder CuO

采用Cu(NO3)2为原料,分别以NH4HCO3、NH3·H2O、NaOH及NaOH与Na2CO3的混合液为沉淀剂,制备了CuO超细粉体,借助XRD、SEM、FT IR、TG DTA、TPR等技术对粉体形态结构与活性等进行了研究。结果表明,沉淀剂对CuO超细粉体的粒径、形貌、催化活性和氧化能力有显著影响;含Na+沉淀剂制备的CuO粉体的各种性能均优于含NH4+的沉淀剂,前者所得粉体具有晶粒细小、粒度分布均匀、比表面积大、催化活性高、氧化能力强等特点;由NaOH与Na2CO3混合液沉淀剂得到的Cu2(OH)2CO3前驱体,热解制备CuO超细粉体简便易行。

Uitrafine powder CuO was prepared from Cu(NO_3)_2 and four kinds of precipitants,including NH_4HCO_3,NH_3·H_2O,NaOH and mixed solution of NaOH and Na_2CO_3,by a precipitation method.XRD,FT-IR,SEM,TG-DTA,TPR and surface area measurement techniques were used to investigate the properties of the CuO powder.The results show that the precipitants have a great impact on crystallite size,morphology,surface structure,and activity of the powder for H_2O_2 decomposition,and it was found that performance of the powder prepared by containing Na^+ precipitant,which has smaller crystal size,higher surface area and better catalytic activity,is prior to that of containing NH_4^+ precipitant.The method of preparing CuO by heating Cu_2(OH)_2CO_3 obtained from precipitants mixed solution of NaOH and Na_2CO_3 possesses the advantages of simple processing,easy controlling and low cost.