CO2 capture by modified porous carbon adsorbents: Effect of various activating agents

In Situ Growth Synthesis of the CNTs@AC Hybrid Material for Efficient Nitrate-Nitrogen Adsorption

“…They were the C–O–C peak at 286.3 eV and the N–C=O peak at 288.1 eV, which could be derived from the combination of NO 3 –N and −C=O groups. 46 , 47 The O 1s spectra in Figure 5 c had two analytical peaks. The peaks at 530.4 and 531.2 eV corresponded to C=O groups of ketone, carbonyl, and lactone.…”

Modulating the porosity of carbons for improved adsorption of hydrogen, carbon dioxide, and methane: a review

“…9,16,18,82,295 Thus, when 'alternative' chemical activating agents are reported that yield lower surface area materials, the suggested application is typically some form of CO2 capture (see table 2). 8,96,233,254,289 As an example, a recent paper by Weiwei Shi and co-workers found that activating ammonium citrate with CuCl2 generates carbons were with hierarchical pore structure, albeit almost exclusively (up to 94 %) in the micropore region. The authors' hypothesis is that coordination between Cu 2+ ions and organic moieties is one of the driving forces for porosity…”

“…82,98,178,220,238,[244][245][246][247] Similarly, in the case of CO 2 and CH 4 capture and storage, increased surface area is generally associated with improved gravimetric uptake. 14,35,131,132,194,[248][249][250][251][252][253][254][255] However, depending on the prevailing pressure, CO 2 capture is much less dependent on surface area, and having pores of the appropriate size is more important. 132,244,252,256 In fact recent work by Jing Cui et al suggests that excessive volumetric surface area results in poor selectivity of CO 2 over N 2 , a metric which is vital in many industrial applications.…”

Tailoring Low-Cost Granular Activated Carbons Intended for CO2 Adsorption

“…Numerous materials have been investigated for CO 2 adsorption, which includes zeolites, silica, metal-organic frameworks (MOFs), alkali-based and metal oxide-based adsorbents, porous polymers and carbonaceous materials (Songolzadeh et al, 2012 ; Lee and Park, 2015 ; Rashidi and Yusup, 2016 ). Amongst them, activated carbons (ACs) are a promising option (Silvestre-Albero et al, 2011 , 2014 ; Sevilla et al, 2019 ) because they: present stability in terms of resistance to thermal, mechanical and chemical strength; are safe for the environment; can be easily produced from abundant and cheap raw materials such as coal, biomass and petroleum residues, which is of overwhelming importance in large-scale applications; are hydrophobic, which is important to avoid competitive adsorption of water; can have the pore morphology easily designed by an appropriate choice of activation conditions; have fast adsorption/desorption kinetic; establish weak interactions with CO 2 , which makes easy and less energy demanding the discharge process by thermal or pressure modulation (Wang et al, 2013 ; Parshetti et al, 2015 ; Li and Xiao, 2019 ; Singh et al, 2019 ).…”