Syntheses of new high-symmetric polyoxometalates with Mo4O4 cubane core
作者:Xi-Yuan Zhou、Fei Wang、Jian Zhang
DOI:10.1016/j.jssc.2022.123647
日期:2023.1
Presented here are a series of new polyoxometalates (POMs) containing Mo4O4 core. Thanks to the large Mo4O4 cubane template, the new cluster exhibits the same Td symmetry as classic Keggin POM but higher nuclear number and more heterometal atoms. Moreover, the third order nonlinear optical (NLO) properties of them are also researched.
这里介绍的是一系列含有 Mo 4 O 4核心的新型多金属氧酸盐 (POM)。由于大的 Mo 4 O 4立方烷模板,新的簇表现出与经典 Keggin POM 相同的 Td 对称性,但具有更高的核数和更多的异金属原子。此外,还研究了它们的三阶非线性光学(NLO)特性。
The effect of different ZnO precursors on the catalytic decomposition of ethanol
作者:Samih A. Halawy、Mohamed A. Mohamed
DOI:10.1016/1381-1169(95)00017-8
日期:1995.5
Three different samples of ZnO were prepared from the thermal decomposition, at 500 degrees C in N-2, of three precursors, i.e. Zn(CH3CO2)(2) . 2H(2)O, Zn-3(C6H5O7)(2) . 2H(2)O and Zn(NO3)(2) . 6H(2)O. These oxide samples were characterized by XRD and IR spectroscopy and their surface area were calculated using the BET method. The excess surface oxygen for each oxide was determined using the hydrazine method. Also, the basicity of such oxides were estimated thermogravimetrically using formic acid adsorption method. The catalytic decomposition of ethanol, as a test reaction, was studied over ZnO samples in a flow system. Ethylene and acetaldehyde were identified as the reaction products using gas chromatography. The activation energy for the decomposition process of ethanol over ZnO samples was calculated as approximate to 43 kJ mol(-1). Reaction mechanisms for the formation of ethylene and acetaldehyde as the decomposition products of ethanol are given.