Fibrous Silica KCC-1 as a Platform for Mn-Based Dual Metal Oxide Adsorbents for CO2 Capture

Description

Abstract

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.