Adsorption characteristics of carbon dioxide on organically functionalized SBA-15

Hiyoshi, Norihito; Yogo, Katsunori; Yashima, Tatsuaki

doi:10.1016/j.micromeso.2005.06.010

Cited by 534 publications

(481 citation statements)

References 32 publications

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“…The FT-IR spectra patterns of KIT-6 and p-KIT-6 are shown in Fig. 3 are identied as the C-H stretching vibrations of methyl and methylene groups, 36 and the peak at 1431 is assigned to the C-H deformation vibration of the remaining Si-O-CH-, 37 which has not reacted with the hydroxyl groups through condensation. It should be noticed that the intensities of the peaks at about 3748 cm À1 , which is ascribed to free Si-OH groups, 38 decrease signicantly aer functionalization.…”

Section: Ft-irmentioning

confidence: 99%

Mesoporous KIT-6 silica–polydimethylsiloxane (PDMS) mixed matrix membranes for gas separation

et al. 2015

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In this study, we have explored for the first time the use of the mesoporous KIT-6 silica as an additive to enhance the gas permeability and separation characteristics of PVDF supported polydimethylsiloxane (PDMS) with filler loadings varying between 0 and 25 wt%. The KIT-6 silica was synthesized by a templating method and functionalized through silanization confirmed via Fourier transform infrared spectroscopy. The SEM images of the MMMs suggested that p-KIT-6 silica particles could embed well into the PDMS matrix and the MMMs could be defect free. With an optimum loading of 2 wt%, the C 4 H 10 permeability and C 4 H 10 /N 2 ideal selectivity of the MMM were shown to increase by 464% and 248% compared with the neat polymer membrane, respectively. In addition, the optimum membrane was also evaluated for CO 2 /N 2 separation, which proved that the permeability and selectivity increasedsimultaneously. An interface morphology has also been proposed to explain the separation phenomenon of the MMM reasonably. Taken all together, it is expected that the mesoporous KIT-6 silica would be an attractive additive to enhance the gas separation performances of polymer membranes.

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Section: Ft-irmentioning

confidence: 99%

Mesoporous KIT-6 silica–polydimethylsiloxane (PDMS) mixed matrix membranes for gas separation

et al. 2015

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“…However, the IR band for hydrogen-bonded carbamic acids is not observed. Hiyoshi et al [33] assigned similar frequencies with different intensities of the ammonium carbamate ion pairs bands. NH stretching of ammonium carbamate at 3440 cm -1 was detected in FIGURE 4 (ii).…”

Section: Resultsmentioning

confidence: 98%

“…Referring to FIGURE 4 (iii), a band at 1552 cm -1 represent COO -asymmetric stretching of carbamate (ionic form) and NH deformation in NH 3 + was appeared at 1484 cm -1 [34]. A weak shoulder at 1432 cm -1 appeared on the band at 1468 cm -1 is due to COO -symmetric stretch [33][34][35][36][37]. Formation of these new absorption bands respectively due to the formation of alkylammonium carbamate by chemisorption of CO 2 towards ODA compounds.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of CO2 on silica dioxide catalyst impregnated with various alkylamine

Tahari

Yarmo

2014

AIP Conference Proceedings

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Abstract. Silica dioxide catalyst (SiO 2 ) can be modified by impregnating amine-containing compounds to improve the CO 2 adsorption capacity. Four type of amines, i.e., monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA) and octadecylamine (ODA) were supported on silica dioxide particles. The amine-modified samples were characterized using FTIR, BET and FESEM. All the prepared solid sorbents exhibited type IV isotherm with hysteresis loop. Specific surface areas of the sorbents were significantly reduced due to blocking of micropores and mesopores by the amine compounds. Reactivity of solid sorbents towards CO 2 was evaluated using isothermal CO 2 adsorption by BET. CO 2 adsorption capacity increased with the weight percent of amine compounds loaded onto the SiO 2 . 15 and 25 wt % MEA/SiO 2 and 25 wt % ODA/SiO 2 sorbents showed greater CO 2 adsorption capacities compared to the virgin sample (SiO 2 ). This study shows that the order of adsorption capacity for the four types of amines was MEA (4.05 wt % CO 2 /adsorbent) > ODA (2.45 wt % CO 2 /adsorbent) > DEA (1.71 wt % CO 2 /adsorbent) > TEA (0.91 wt % CO 2 /adsorbent). CO 2 uptakes by ODA/SiO 2 sorbents were higher than DEA/SiO 2 and TEA/SiO 2 is mainly due to their smaller pore volume and pore width of the adsorbent, therefore, greater interactions of CO 2 -ODA in pores. MEA/SiO 2 has the highest ability in capturing CO 2 because of the increasing steric hindrance of long chain ODA and alkyl substituent on DEA and TEA.

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“…25,26 The broad bands at 1980 and 1850 cm -1 are overtone vibrations of Si-O-Si groups. 27 The absorption at 932 cm -1 can be attributed to the stretching vibration of Si-OH. 25 The bands at 3300, 1595 and 770 cm -1 correspond to the symmetric stretching, deformation and wagging vibration of N-H, respectively.…”

mentioning

confidence: 99%

“…25,28 The absorption at 1660 cm -1 is due to deformation of the protonated amino groups R-NH 3 +  -O-Si. 27 Peaks at 2930, 2880, 2810, 1460, 1410, 1346, and 1276 cm -1 are due to the vibrations of methylene groups in the bridging spacer. 28,29 The absorption band at 690 cm -1 can be assigned to the Si-CH 2 stretching.…”

mentioning

confidence: 99%

Mesoporous amine‐bridged polysilsesquioxane for CO₂ capture

Duan

et al. 2011

Greenhouse Gases

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a novel class of amine-supported sorbents based on amine-bridged mesoporous polysilsesquioxane was developed via a simple one-pot sol-gel process. The new sorbent allows the incorporation of a large amount of active groups without sacrificing surface area or pore volume available for CO 2 capture, leading to a CO 2 capture capacity of 3.2 mmol g -1 under simulated flue gas conditions. The sorbent is readily regenerated at 100 °C and exhibits good stability over repetitive adsorption-desorption cycling.

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Adsorption characteristics of carbon dioxide on organically functionalized SBA-15

Cited by 534 publications

References 32 publications

Mesoporous KIT-6 silica–polydimethylsiloxane (PDMS) mixed matrix membranes for gas separation

Mesoporous KIT-6 silica–polydimethylsiloxane (PDMS) mixed matrix membranes for gas separation

Adsorption of CO2 on silica dioxide catalyst impregnated with various alkylamine

Mesoporous amine‐bridged polysilsesquioxane for CO₂ capture

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Adsorption characteristics of carbon dioxide on organically functionalized SBA-15

Cited by 534 publications

References 32 publications

Mesoporous KIT-6 silica–polydimethylsiloxane (PDMS) mixed matrix membranes for gas separation

Mesoporous KIT-6 silica–polydimethylsiloxane (PDMS) mixed matrix membranes for gas separation

Adsorption of CO2 on silica dioxide catalyst impregnated with various alkylamine

Mesoporous amine‐bridged polysilsesquioxane for CO2 capture

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Product

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Mesoporous amine‐bridged polysilsesquioxane for CO₂ capture