The thermal analysis of CoC2O4. 2H(2)O, Co(HCOO)(2). 2H(2)O and Co(CH3COO)(2). 4H(2)O was carried out with simultaneous TG-DTG-DTA measurements under non-isothermal conditions in air and argon atmospheres. The intermediates and the end products of decomposition were characterised by X-ray diffraction and IR and UV-VIS spectroscopy. The decomposition of the studied compounds occur in several stages. The first stage of dissociation of each compound is dehydration both in air and argon. The next stages differ in air and argon. The final product of the decomposition of each compound in air is Co3O4. In argon it is a mixture of Co and CoO for cobalt(II) oxalate and cobalt(II) formate but CoO for cobalt(II) acetate.
为了有效合成过渡金属钴氧化物纳米颗粒(Co 3 O 4 NPs),而无需使用任何昂贵且有毒的溶剂或复杂的设备,在此工作中使用了共沉淀法。使用扫描电子显微镜(SEM),能量色散X射线光谱(EDX),UV-Vis分光光度法,傅立叶变换红外光谱(FTIR)和X射线衍射(XRD),对制备的Co 3 O 4 NP进行了表征。并确定。制备Co 3 O 4的影响通过点击(反应)化学研究了在不同微波辐照功率和辐照时间下硒代吡啶/喹啉衍生物的合成过程中的NPs。可重复使用的Co 3 O 4纳米粒子在微波辐射下具有较高的催化活性,用于合成有机硒化合物,具有较高的收率(> 90%),较温和的反应条件和较短的时间,而不会显着降低反应速率和收率。
Microwave‐associate synthesis of Co
<sub>3</sub>
O
<sub>4</sub>
nanoparticles as an effcient nanocatalyst for the synthesis of arylidene barbituric and Meldrum's acid derivatives in green media
作者:Mahdieh Yahyazadehfar、Enayatollah Sheikhhosseini、Sayed Ali Ahmadi、Dadkhoda Ghazanfari
DOI:10.1002/aoc.5100
日期:——
conditions using controlled, effective, and facile microwave method. The final nanostructures were characterized by SEM, XRD, and TEM analyses. The products had a small size distribution, homogeneous morphology, and crystallographic structures associated with the formation of Co3O4 nanostructures. Moreover, EDS mapping analysis confirmed the existence of Co and O elements in the final structure, and the
在这项研究中,使用可控,有效且简便的微波方法,在环境适宜的条件下构建了Co 3 O 4纳米催化剂。通过SEM,XRD和TEM分析来表征最终的纳米结构。产物具有较小的尺寸分布,均匀的形态和与Co 3 O 4形成相关的晶体结构纳米结构。此外,EDS作图分析证实了最终结构中存在Co和O元素,并通过VSM研究了样品的磁性。此纳米结构中的催化方法中的应用进一步检查,结果表明,它可作为一种新的候选为亚芳基巴比妥和麦德鲁姆的合成, s至由巴比妥和麦德鲁姆醛的Knoevenagel缩合酸, S酸性中水性介质。这些纳米催化剂的高产率将由纳米结构的性质以及本研究开发的实验程序来证明,这影响了产物的理化特性。
Thermal decomposition of carbonates, carboxylates, oxalates, acetates, formates, and hydroxides
作者:Jacob Mu、D.D. Perlmutter
DOI:10.1016/0040-6031(81)80175-x
日期:1981.11
Abstract A study is reported of the controlled decomposition of various metal carbonates, carboxylates, oxalates, acetates, formates and hydroxides and their common hydrates, carried out in a thermogravimetric analyzer, a differential scanning calorimeter, and a differential thermal analyzer. Various sample sizes, heating rates, and ambient atmospheres were used to demonstrate their influence on the
Boosting electrochemical water oxidation through replacement of O<sub>h</sub> Co sites in cobalt oxide spinel with manganese
作者:Prashanth W. Menezes、Arindam Indra、Vitaly Gutkin、Matthias Driess
DOI:10.1039/c7cc03749j
日期:——
The strikingly high catalytic performance and stability of manganese substituted cobalt oxide spinel (MnxCo3-xO4) over pristine cobalt oxide spinel (Co3O4) for the alkaline electrochemical water oxidation is reported. The different role of cations could be uncovered along with the detection of drastic surface-structural changes during the catalysis using spectroscopic and microscopic methods.
据报道,锰取代的氧化钴尖晶石(Mn x Co3-xO 4)相对于原始的氧化钴尖晶石(Co 3 O 4)具有极高的催化性能和稳定性,可用于碱性电化学水氧化。阳离子的不同作用以及使用光谱和显微镜方法检测催化过程中剧烈的表面结构变化均可发现。
Heterogeneous Cobalt-Catalyzed Direct<i>N</i>-Formylation of Isoquinolines with CO<sub>2</sub>and H<sub>2</sub>
作者:Zhenhong He、Hangyu Liu、Huizhen Liu、Qingli Qian、Qinglei Meng、Qingqing Mei、Buxing Han
DOI:10.1002/cctc.201601682
日期:2017.6.8
(FTHIQs) are valuable fine chemicals and key intermediates. Herein, we report for the first time the Co0/ZnCl2‐catalyzed direct N‐formylation of IQs by using CO2 with H2 to produce FTHIQs. It was discovered that the Co catalyst and ZnCl2 worked synergistically in catalyzing the N‐formylation reactions, and moderate to high yields of the desired products could be obtained, depending on the nature of the substrates
Non-precious Mn<sub>1.5</sub>Co<sub>1.5</sub>O<sub>4</sub>–FeN<sub>x</sub>/C nanocomposite as a synergistic catalyst for oxygen reduction in alkaline media
作者:Rongzhong Jiang、Dat T. Tran、Joshua P. McClure
DOI:10.1039/c6ra15040c
日期:——
A nanocomposite material containing non-precious bimetal oxides and FeN-doped carbon was synthesized with double synergistic effect for ORR.