Mg-O-F Nanocomposite Catalysts Defend against Global Warming via the Efficient, Dynamic, and Rapid Capture of CO at Different Temperatures under Ambient Pressure.

The utilization of Mg-O-F prepared from Mg(OH) mixed with different wt % of F in the form of (NHF·HF), calcined at 400 and 500 °C, for efficient capture of CO is studied herein in a dynamic mode. Two different temperatures were applied using a slow rate of 20 mL·min (100%) of CO passing through each sample for only 1 h. Using the thermogravimetry (TG)-temperature-programed desorption (TPD) technique, the captured amounts of CO at 5 °C were determined to be in the range of (39.6-103.9) and (28.9-82.1) mg ·g for samples of Mg(OH) mixed with 20-50% F and calcined at 400 and 500 °C, respectively, whereas, at 30 °C, the capacity of CO captured is slightly decreased to be in the range of (32.2-89.4) and (20.9-55.5) mg ·g, respectively. The thermal decomposition of all prepared mixtures herein was examined by TG analysis. The obtained samples calcined at 400 and 500 °C were characterized by X-ray diffraction and surface area and porosity measurements. The total number of surface basic sites and their distribution over all samples was demonstrated using TG- and differential scanning calorimetry-TPD techniques using pyrrole as a probe molecule. Values of (Δ) enthalpy changes corresponding to the desorption steps of CO were calculated for the most active adsorbent in this study, that is, Mg(OH) + 20% F, at 400 and 500 °C. This study's findings will inspire the simple preparation and economical design of nanocomposite CO sorbents for climate change mitigation under ambient conditions.