Constructing and synthesizing optimal Cu-BTC and its application in low-temperature denitration

Journal of Materials Science - The low-temperature catalytic efficiency of the catalyst and poor sulfur resistance are the shortcomings of traditional catalysts, which greatly limit its industrial...     

Preparation of uranium oxides by reductive denitration of uranyl nitrate under microwave heating

Autoclave denitration of solid uranyl nitrate in the presence of hydrazine hydrate at 120°C under the action of microwave radiation (MWR) leads to the formation of uranium dioxide with simultaneous breakdown of excess hydrazine hydrate and nitrate ions. The reaction yields UO₂ when performed in an open system in a reducing medium and U₃O₈ when performed under the conditions of contact with air. Thus, principles have been developed for a new, virtually waste-free procedure for the synthesis of uranium dioxide for the subsequent preparation of oxide nuclear fuel. The procedure is characterized by high rate and considerably reduced power consumption, compared to the similar process performed with convective heating.     

Co修饰CeO2复合材料的晶面调控及其光热催化脱硝性能

采用一步水热法，通过调节Co与Ce的摩尔比，制备出暴露高活性晶面的Co修饰CeO₂复合材料。利用比表面和孔径分析仪、TG-DSC、TEM、SEM、XRD、紫外-可见分光光度计(UV-vis)、XPS、光热催化脱硝技术对Co修饰CeO₂复合材料进行全面表征。结果表明，随着Co元素含量的增加，Co修饰CeO₂复合材料的比表面积增大，CeO₂呈纳米棒状结构，Co与表面氧生成Co₃O₄，二者的共结晶过程降低了复合材料的结晶表面能，使CeO₂主要暴露(200)和(220)高活性晶面，且暴露比例增大。光热催化脱硝结果表明，当Co与Ce摩尔比为15%、煅烧温度为400℃时，Co修饰CeO₂复合材料的光热催化效率达到最高，为98%。