Amines immobilized double-walled silica nanotubes for CO2 capture

Carbon dioxide adsorption on micro-mesoporous composite materials of ZSM-12/MCM-48 type: The role of the contents of zeolite and functionalized amine

“…The main photoelectron line of Na 1s and Al 2p shown in 1072.1 eV and 74.4 eV were only observed with greater clarity in the sample ZSM-12, which also exhibited besides these an intense peak at 260.0 eV due to the KLL Auger line. The line Al 2s observed in all spectra is very broad and non-symmetrical probably due to the overlapping of this line with the Si 2p line which is found in the same region [52][53].…”

“…The binding energies of Si 2p and O 1s on the ZSM-12/MCM-48 composites were 103.6 eV and 532.9 eV, respectively [52][53][54][55]. These photoelectronic lines are symmetric, and the values of the binding energies correspond to the lines of these elements on the compounds formed between them, ie a silicon oxide and aluminosilicate [54][55].…”

Tailoring amine functionalized hybrid ceramics to control CO2 adsorption

“…The CO 2 sorption capacity usually decreases for amine grafted silica with temperature as observed for double-walled silica nanotubes and pore expanded mesoporous silica grafted with amines [51,60]. This is expected since only strong amine -CO 2 interactions will contribute to the sorption capacity at higher temperatures.…”

“…As an example, CO 2 sorption capacities of up to 2.2 mmol g -1 at 25 °C and amine efficiencies close to 0.5 (CO 2 / N) were reported for double-walled silica nanotubes that where surface modified with amine group bearing polysiloxanes [51]. The maximal sorption capacities of the hybrid ceramic materials determined within this study (1.9 mmol g -1 for BisAp350 measured at 0 °C and 1.1 mmol g -1 for APTES 200 p350 measured at 100 °C) are therefore competitive with polymeric surface functionalizations.…”

The Virtuous CO2 Circle or the Three Cs: Capture, Cache, and Convert

“…Several other nanostructured substrates were used to produce solid sorbents functionalized with amine groups (e.g., nanotubes derived from inorganic reagents such as titanium dioxide [11,12], silica [13], halloysite nanotubes [14], and carbon nanotubes [15]). …”