摘要
以大孔二氧化硅为载体,采用浸渍法负载铂制备了3%Pt/SiO2催化剂,用于硝酸肼催化还原硝酸铀(Ⅵ)酰制备四价铀(U(Ⅳ)),考察了催化剂用量、硝酸浓度、硝酸肼浓度和反应温度对催化还原铀(Ⅵ)反应的影响。表征结果显示,催化剂中铂主要以1~3 nm的纳米粒子形态堆积在多孔SiO_(2)载体表面;优化的催化反应条件为:反应液为1.0 mol/L硝酸肼、0.8 mol/L硝酸、0.9 mol/L硝酸铀酰,催化剂用量(与反应液的固液比)为3:100,在60℃反应40 min,U(Ⅵ)转化率为100%。
The 3%Pt/SiO_(2)catalyst was prepared by using macroporous silica as the carrier and supportingplatinum via impregnation method,which was used for the catalytic reduction of uranyl(Ⅵ)nitrate to uranium(U(Ⅳ))with hydrazine nitrate.The effects of catalyst dosage,nitric acid concentration,hydrazine nitrate concentration and reaction temperature on the catalytic reduction of U(Ⅵ)were investigated.The characterization results showed that Pt in the catalyst was mainly deposited on the surface of porous SiO_(2)carrier in the form of 1~3 nm nanoparticles.The optimal catalytic reaction conditions are as follows:1.0 mol/L of hydrazine nitrate,0.8 mol/L nitric acid,0.9 mol/L uranyl nitrate,a solid-liquid ratio in the reaction solution of 3:100,60℃of reaction temperature for 40 min.The conversion rate of U(Ⅵ)was 100%under the optimal conditions.
作者
史海
梁兵连
张旭
赵许群
侯宝林
SHI Hai;LIANG Bing-lian;ZHANG Xu;ZHAO Xu-qun;HOU Bao-lin(Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China)
出处
《贵金属》
CAS
北大核心
2021年第1期28-33,共6页
Precious Metals
