The performance of nickel oxide catalysts was investigated using temperature programmed reduction (TPR) with promoter doping consisting of main group and transi

The activated carbon (AC) supported bimetallic oxides of Ag-Fe/AC and Ni-Fe/AC were synthesized by the wet impregnation method. The adsorbents were explored to

Carbon dioxide emission as part of the greenhouse effect had been the biggest hurdle to the continuity of humankind. Thus, CO₂ adsorption and storage have been considered as one of the solutions to this biggest problem of 20^th century. CaO and activated carbon are widely known as the best material for CO₂ adsorption. This study used these two materials and determine if the combination of the materials will improve the adsorption capability. Activated carbon mixed with various concentration of CaO (10%, 20%, 30%, 40% and 50%) was prepared using wet impregnation method and calcined in 99.9% N₂ at 850 °C for 1 hour. The samples were next characterized using X-Ray Diffraction (XRD) to determine crystallinity and N₂ adsorption-desorption for analyzing surface area of the samples. Adsorption and desorption behavior of CO₂ adsorption was determined using CO₂-Temperature Programmed Desorption (TPD). N₂ adsorption-desorption analysis had shown that samples surface area ranging from 126.7 m² g⁻¹ to 449.3 m² g⁻¹. XRD had also shown increasing intensity of peak CaO and Ca(OH)₂ following the increasing amount of CaO mixed with activated carbon. 30% CaO mixed with activated carbon has shown the highest amount of CO₂ desorbed in the TPD profile. At this level, we expected some physical-chemical interaction between CaO and activated carbon used in this study.

The continuous rise in atmospheric CO2 levels due to industrial emissions and fossil fuel combustion has intensified the need for efficient carbon capture. Solid adsorbents are favoured for their reusability and low energy demand, yet often face limitations in thermal stability and adsorption performance. This study examines the effect of co-loading manganese (Mn) with potassium (K), copper (Cu), and calcium (Ca) on fibrous silica KCC-1 for CO2 capture over a wide temperature range. KCC-1 was synthesised via a microemulsion method, and metals were introduced using an ultrasonic-surfactant-assisted impregnation technique. Characterisation using XRD, FTIR, BET, FESEM-EDX, and CO2-TPD confirmed structural integrity, surface functionality, and adsorption behaviour. CaO-MnO@KCC-1 shows the most balanced textural properties and the highest CO2 uptake due to its strong basicity and varied adsorption site strength. This highlights its potential as a temperature-flexible CO2 adsorbent.