Mg–O–F Nanocomposite Catalysts Defend against Global Warming via the Efficient, Dynamic, and Rapid Capture of CO₂ at Different Temperatures under Ambient Pressure

Abstract

The utilization of Mg−O−F prepared from Mg(OH) 2 mixed with different wt % of F in the form of (NH 4 F•HF), calcined at 400 and 500 °C, for efficient capture of CO 2 is studied herein in a dynamic mode. Two different temperatures were applied using a slow rate of 20 mL•min −1 (100%) of CO 2 passing through each sample for only 1 h. Using the thermogravimetry (TG)-temperature-programed desorption (TPD) technique, the captured amounts of CO 2 at 5 °C were determined to be in the range of (39.6−103.9) and (28.9−82.1) mg COd 2 •g −1 for samples of Mg(OH) 2 mixed with 20−50% F and calcined at 400 and 500 °C, respectively, whereas, at 30 °C, the capacity of CO 2 captured is slightly decreased to be in the range of (32.2−89.4) and (20.9− 55.5) mg COd 2 •g −1 , 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 (ΔH) enthalpy changes corresponding to the desorption steps of CO 2 were calculated for the most active adsorbent in this study, that is, Mg(OH) 2 + 20% F, at 400 and 500 °C. This study's findings will inspire the simple preparation and economical design of nanocomposite CO 2 sorbents for climate change mitigation under ambient conditions.

ZnxMg1‐xO Solid Solutions: Efficient Bifunctional Acid‐Base Catalyst for the synthesis of Methyl Ethyl Oxalate from Dimethyl Oxalate and Ethanol

“…These changes of surface defects modify the distribution of active sites on the surface of MgO to enhance the catalytic activity. [21] Wang [22] has successfully applied Zn x Mg 1-x O solid solution as an effective catalyst for photocatalytic hydrogen evolution capacity, and Kuang [23] has successfully prepared Zn x Mg 1-x O solid solution for improving photoelectrochemical anti-corrosion performance. Since there has been no previously reported application of Zn x Mg 1-x O solid solutions in the transesterification reactions.…”

“…The metal‐oxygen pairs of O and Zn, and Mg coordination in the lattice of Zn 2+ into MgO are also changed. These changes of surface defects modify the distribution of active sites on the surface of MgO to enhance the catalytic activity [21] . Wang [22] has successfully applied Zn x Mg 1‐x O solid solution as an effective catalyst for photocatalytic hydrogen evolution capacity, and Kuang [23] has successfully prepared Zn x Mg 1‐x O solid solution for improving photoelectrochemical anti‐corrosion performance.…”

Utilizing Undissolved Portion (UNP) of Cement Kiln Dust as a Versatile Multicomponent Catalyst for Bioethylene Production from Bioethanol: An Innovative Approach to Address the Energy Crisis

“…Therefore, the Earth is facing a severe environmental disaster due to global warming caused by the steady rise of atmospheric CO 2 emissions . In May 2022, the Scripps Institute of Oceanography at the University of California released data indicating that the daily average concentration of atmospheric CO 2 reached an unprecedented height of 421.37 ppm . Presently, the cement industry ranks as the third largest consumer of industrial energy, and its production is responsible for approximately 6–7% of global anthropogenic CO 2 emissions .…”

“…10 In May 2022, the Scripps Institute of Oceanography at the University of California released data indicating that the daily average concentration of atmospheric CO 2 reached an unprecedented height of 421.37 ppm. 11 Presently, the cement industry ranks as the third largest consumer of industrial energy, and its production is responsible for approximately 6−7% of global anthropogenic CO 2 emissions. 2 The production of one ton of cement clinker results in the generation of approximately 54− 200 kg of CKD, along with the release of 600−700 kg of CO 2 gas into the environment.…”