The alarming increase in global CO₂ emissions has spurred significant concern. Carbon capture and storage (CCS) technology offers the most practical near-term solution. Among various CCS adsorbent materials, amine-functionalized solid adsorbents demonstrate great potential due to their high CO₂ affinity and low regeneration energy requirements. However, few studies have investigated the effects of different templating agents and template removal methods on porous silica supports. This study prepared silica particles using CTAB and P123 as templating agents, with templates removed by hydrochloric acid reflux and calcination methods, respectively. This work systematically compares how different templating agents (CTAB/P123) and removal methods (acid reflux/calcination) affect silica pore structures and their CO₂ adsorption performance. Comparative results demonstrate that CTAB template removal via hydrochloric acid reflux significantly enhances the CO₂ capture capacity of silica. To further enhance silica's CO₂ adsorption performance, this study investigated the effects of amine modifier types and loading amounts. Experimental results show a positive correlation between increased amine group density and enhanced CO₂ adsorption performance within the investigated range (2.65–4.80 mmol N/g). The silica with CTAB removed by hydrochloric acid reflux demonstrated optimal CO₂ adsorption capacity (83.2 mg/g) after modification with 11.6 mmol TA/g support. • Systematic evaluation of templating agents and removal methods on silica pore structure and CO 2 adsorption properties. • Modified silica after HCl reflux to remove CTAB template increased in specific surface area. • The CO 2 adsorption capacity of optimized silica reached 83.2 mg/g after modification with 11.6 mmol TA/g support.
Yang et al. (Thu,) studied this question.