In this work, ethylenediamine tetraacetic acid disodium (EDTA·2Na) is used as a complexing agent to control the preparation of micron‐sized barium sulfate spheres via a precipitation reaction between sodium sulfate and barium chloride at 35 °C. To better characterize the morphology, structure and particle size of barium sulfate spheres and to understand the formation mechanisms, X‐ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), laser particle size analyser (PSD) and scanning electron microscopy (SEM) are employed. The influence of the reaction conditions such as pH, [EDTA/Ba2+] ratio, [Ba2+] concentration and reaction time are investigated. These parameters affected the size and morphology of barium sulfate. Moreover, this work attempts to provide a primary understanding of the formation mechanism of micron‐sized spherical barium sulfate spheres
Formic acid and formate derivatives as hydrogen source on the hydrogenation of para‐chloronitrobenzene (p‐CNB) over supported gold catalysts were investigated. The hydrogenation activity in various formate derivatives followed the order: HCOOH < HCOONa < HCOOK < HCOONH4, which was in accordance with the decrement of electronegativity of cation species in formate derivatives. Moreover, in the case of HCOONH4 as hydrogen source, the p‐CNB conversion could enhance ten‐fold as the hydrogen source of H2 at 60 oC. This promotion effect was also found in other supported Au catalysts. These results provide a general alternative hydrogen source to replace conventional H2 as reducing agent for fine chemical processes.
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