CO2 adsorption performance for amine grafted particulate silica aerogels

APTES grafted ordered mesoporous silica KIT-6 for CO2 adsorption

“…Liu et al [28] functionalized the KIT-6 by tetraethylenepentamine using wet-impregnation method and showed an adsorption capacity 2.9 mmol g À1 at 60°C using gas chromatograph (GC) with a 10% CO 2 in feed gas. Linneen et al [40] functionalized the aerogel with APTES using grafting method and showed the CO 2 adsorption capacity 0.67 mmol g À1 at 1 bar and 25°C. Recently, Zhang et al [29] studied the CO 2 sorption in wet KIT-6 at high pressure ($4.5 MPa).…”

Preparation of triethylenetetramine‐modified zirconosilicate molecular sieve for carbon dioxide adsorption

“…One can see that with increase of Zr/Si molar ratio from 0.025 to 0.1, there is rapid rise of surface acidity, plausibly due to the electron vacancies created due to Zr incorporation. At a Zr/Si ratio of 0.075, the NH 3 -TPD peak suggests an amount of acid sites that is up to 1.129 mmol g 21 . In view of the corresponding rise of CO 2 adsorption capacity (Table 2), it is reasonable to accept that the introduction of a moderate amount of Zr into MCM-41 has an affirmative effect on CO 2 capture.…”

“…With lone-pair electrons at N atoms, TETA reacts with CO 2 to form carbamates. It is considered that the amines are CO 2 -capture agents apt for the formation of carbamate under dry conditions [16][17][18][19][20][21][22][23][24]26].…”

“…For practical use, an adsorbent should satisfy the requirements of high adsorption capacity and stable performance during long-term cyclical operation [11,15,[17][18][19][20][21][22][23]25]. As illustrated in Figure 8, the Zr-MCM-41-TETA-200 adsorbent exhibits high and stable adsorption capacity in a test of 10 cycles.…”

“…Accordingly, it is profoundly important to develop advanced materials for the capture of CO 2 at source. Many solid adsorbents were fabricated for this purpose, such as hydrotalcite [8], lithium-based salts [9][10][11][12], metal oxides [13][14][15], and amine-functionalized porous materials [16][17][18][19][20][21][22][23][24][25][26][27]. Despite the former three groups of materials exhibit good adsorption ability at high temperatures it is hard to have them regenerated at low temperatures.…”