基于双金属Y/Zr-UiO-67的介孔氧化钇-氧化锆固溶体制备及其离子电导

采用溶剂热法,将不同物质的量的Y~(3+)离子掺入金属有机框架UiO-67的次级结构单元(SBUs),得到具有Zr(Ⅳ)-O及Y(Ⅲ)-O混合次级结构单元的双金属有机框架Y/Zr-Ui O-67。以此金属有机框架结构作为模板通过两步煅烧法制备介孔钇掺杂氧化锆。结果表明,这种金属有机框架结构衍生的氧化钇-氧化锆固溶体有高的比表面积和氧离子电导率。     

水热法制备氧化钇空心纳米花及其吸附性能

采用水热法制备单分散、粒径均一的碱式碳酸钇(Y(OH)CO3)前驱体,经过高温煅烧处理得到氧化钇(Y_2O_3)空心纳米花。通过傅里叶转换红外分析(FT-IR),场发射扫描电子显微镜(FESEM),透射电子显微镜(TEM),X射线衍射(XRD),X射线能谱(XPS)以及N2吸-脱附等来表征样品,并研究了Y_2O_3空心纳米花吸附重铬酸钾(K2Cr2O7)的能力。实验结果表明:水热法制备的前驱体为Y(OH)CO3,经高温煅烧处理得到立方相Y_2O_3空心纳米花,尺寸约140 nm,比表面积为15 m2·g-1,讨论了Y_2O_3空心纳米花的形成机理。水热法制备的Y_2O_3空心纳米花对K2Cr2O7溶液的去除率可高达88.5%,吸附量为11.06 mg·g-1,约为Y_2O_3粉末的6倍。     

Yttria promoted metallic nickel catalysts for the partial oxidation of methane to synthesis gas

A metallic Ni catalyst was prepared with nickel sponge, followed by acid treatment. It was further promoted with yttria by an impregnation method. The catalysts were characterized by SEM, BET, XRD, TPR, XPS, etc., and studied in the partial oxidation of methane to syngas. The characterization results showed that the yttria promoted metallic Ni catalysts had high specific surface area and more NiO. The reaction results showed that the yttria promoter increased the CH4 conversion and the selectivity for H2 and CO.