Direct oxidation of methane to oxygenates over heteropolyanions

Partial oxidation of methane to formaldehyde and methanol was studied at atmospheric pressure in the temperature range of 700-750 °C using heteropolycompound catalysts （NH4）6HSiMo11FeO40, （NH4）4PMo11FeO39, and H4PMo11VO40, which were prepared and characterized by various analysis techniques such as infrared, visible UV, XRD and DTA. O2 or N2O was used as the oxidizing agent, and the principal products of the reaction were CH3OH, CH2O, CO, CO2, and water. The conversion and the selectivity of products depend strongly on the reaction temperature, the nature of oxidizing agent, and the composition of catalyst.     

Membrane separation of ions for the preparation of pure solutions of heteropolycompounds

Reverse osmosis was used for the separation of various types of heteropolyanions (HPA): [PW₁₁O₃₉M(H₂O)] ^k– (M = Co^II, Fe^III, Cr^III), [(PW₁₁O₃₉Fe)₂O]^10– , and [PW₁₁O₃₉ · Fe _n O _x H _y ] ^p– from contaminant ions NO₃ ^– and Na⁺ that are usually introduced into the solution in the synthesis of HPA.Translated fromIzvestiya Akodemii Nauk. Seriya Khimicheskaya, No. 4, pp. 1009–1011, April, 1996.     

CdS纳米棒/酞菁氧钛复合光导体的光电导性能

采用以溶剂热方法合成的CdS纳米棒与酞菁氧钛复合制备的复合光导体,在570nm光照下其光电导性能明显提高,将质量分数为5%的CdS纳米棒与TiOPc复合使光敏性能提高32%.电子结构的数据和表面光电压谱分析结果表明,复合体系中存在从CdS纳米棒到TiOPc的光致空穴转移,TiOPc因被CdS纳米棒敏化而表现出高的光电导性能.     

杂多化合物催化丙烷的选择性氧化

杂多化合物由杂多阴离子和阳离子组成,杂多阴离子具有一定的空间结构,多种不同结合强度的晶格氧能够在氧化-还原反应中起传递电子和氧的作用。杂多化合物具有很强的酸性,可用作双功能催化剂。本文以磷、钼、钒杂多酸中掺杂过渡金属离子Cs^2 、Cu^2 、Fe^3 为催化剂,对丙烷氧化反应进行了研究。