Influence of Pressure and Temperature on the Flexible Behavior of Iron-Based MIL-53 with the CO Host: A Comprehensive Experimental and DFT Study.

This research focuses on developing MIL-53-type compounds with Fe obtained with ligands derived from PET waste, followed by the controlled addition of hydrofluoric acid (HF). Incorporating HF into the MOF structure induced substantial changes in the material textural properties, resulting in a significant change in CO adsorption. Furthermore, a distinctive structural alteration (breathing effect) was observed in the CO isotherms at different temperatures; these structural changes have not been observed by X-ray diffraction (XRD) because this characterization has been performed at room temperature, whereas the adsorption experiments were conducted at 260, 273, and 303 K and different pressures.

Strategies for Improving the CO Adsorption Process of CPO-27-Mg through Thermal Treatment and Urea Functionalization.

In this work, the influence of degassing temperature and urea functionalization were investigated as ways to improve the CO adsorption performance of CPO-27-Mg. Through post-synthesis modification treatments, four samples with different degrees of urea functionalization were obtained, incorporating 10, 25, 50, and 100% of urea concerning the metal sites of the MOF. Alternatively, the influence of the degassing temperature of the non-functionalized MOF between 70 and 340 °C was also evaluated.

Synthesis conditions impact on SrMoO electroceramic: crystal structure, stability and transport properties.

Crystal structure and properties of SrMoO treated at 1100 and 1400 °C were studied synchrotron X-ray powder diffraction and thermogravimetric analysis, coupled with mass spectrometry. Synchrotron studies reveal the crystallographic effect of the annealing temperature, showing that the lowest-temperature phase must be defined in a triclinic symmetry, in contrast to the cubic one obtained at 1400 °C. The mass spectrometry allowed the identification of the released compounds during the thermogravimetric analysis, thus unveiling the physicochemical behavior of the sample during the heating process.