过渡金属酪氨酸配合物热化学性质的研究

合成了过渡金属(铜、镍)与L-酪氨酸的固态配合物,通过化学分析、IR及TG-DTA对其组成及热稳定性进行了研究,确定了配合物的组成为Cu(Tyr) (Ac)2·3H2O和Ni(Tyr)Cl2·5H2O。用HWR-15型恒温式微机量热计测定了上述配合物的恒容燃烧能,并计算了它们的标准摩尔燃烧焓(△c Hφm)和标准摩尔生成焓(△f Hφm     

Dialkoxy disulfides and their branch-bonded thionosulfite isomers

A historical review on the synthesis, physical properties and chemistry of the highly chalcogenated dialkoxy disulfides (ROSSOR) and their isomeric thionosulfites (ROS(S)OR) is provided.     

Solar thermal cracking of methane in a particle-flow reactor for the co-production of hydrogen and carbon

An experimental investigation on the thermal decomposition of CH₄ into C and H₂ was carried out using a 5 kW particle-flow solar chemical reactor tested in a solar furnace in the 1300–1600 K range. The reactor features a continuous flow of CH₄ laden with μm-sized carbon black particles, confined to a cavity receiver and directly exposed to concentrated solar irradiation of up to 1720 suns. The reactor performance was examined for varying operational parameters, namely the solar power input, seed particle volume fraction, gas volume flow rate, and CH₄ molar concentration. Methane conversion and hydrogen yield exceeding 95% were obtained at residence times of less than 2.0 s. A solar-to-chemical energy conversion efficiency of 16% was experimentally reached, and a maximum value of 31% was numerically predicted for a pure methane flow. SEM images revealed the formation filamentous agglomerations on the surface of the seed particles, reducing their active specific surface area.