Mechanisms and Kinetics for Sorption of CO<sub>2</sub> on Bicontinuous Mesoporous Silica Modified with <i>n</i>-Propylamine

Bacsik, Zoltán; Ahlsten, Nanna; Ziadi, Asraa; Zhao, Guoying; Garcia‐Bennett, Alfonso E.; Martín‐Matute, Belén; Hedin, Niklas

doi:10.1021/la202033p

Cited by 262 publications

(363 citation statements)

References 62 publications

(177 reference statements)

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“…However, few works interpret the adsorption mechanism in mesoporous adsorbents, not to mention the desorption mechanism. Bacsik et al [17] used (3-aminopropyl) triethoxysilane-or (3-aminopropyl) methyldiethoxysilane-modified AMS-6 and MCM-48 as the adsorbents. IR spectra was performed to study the adsorption mechanism and concluded ammonium carbamate ion pairs and carbamic acid formed rapidly.…”

Section: Introductionmentioning

confidence: 99%

Desorption Kinetics and Mechanisms of CO2 on Amine-Based Mesoporous Silica Materials

Teng

Liu

et al. 2017

Energies

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Tetraethylenepentamine (TEPA)-based mesoporous MCM-41 is used as the adsorbent to determine the CO 2 desorption kinetics of amine-modified materials after adsorption. The experimental data of CO 2 desorption as a function of time are derived by zero-length column at different temperatures (35, 50, and 70 • C) and analyzed by Avrami's fractional-order kinetic model. A new method is used to distinguish the physical desorption and chemical desorption performance of surface-modified mesoporous MCM-41. The activation energy E a of CO 2 physical desorption and chemical desorption calculated from Arrhenius equation are 15.86 kJ/mol and 57.15 kJ/mol, respectively. Furthermore, intraparticle diffusion and Boyd's film models are selected to investigate the mechanism of CO 2 desorption from MCM-41 and surface-modified MCM-41. For MCM-41, there are three rate-limiting steps during the desorption process. Film diffusion is more prominent for the CO 2 desorption rates at low temperatures, and pore diffusion mainly governs the rate-limiting process under higher temperatures. Besides the surface reaction, the desorption process contains four rate-limiting steps on surface-modified MCM-41.

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Section: Introductionmentioning

confidence: 99%

Desorption Kinetics and Mechanisms of CO2 on Amine-Based Mesoporous Silica Materials

Teng

Liu

et al. 2017

Energies

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“…According to Zoltan et al [32], ammonium carbamate and hydrogen-bonded carbamic acids formed rapidly on contact with dry CO 2 . However, the IR band for hydrogen-bonded carbamic acids is not observed.…”

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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“…8). The high uptake values and weak temperature dependencies suggested chemisorptions of CO 2 at low pressures [24]. Nonetheless, the isotherms were basically linear at high pressure suggestive of physisorption on both modified and unmodified.…”

Section: Co 2 Adsorption Cmentioning

confidence: 94%

Modification of Porous Materials by Saturated Fatty Amine as CO2 Capturer

Tahari¹,

Hakim²,

Hisham³

et al. 2015

IJCEA

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the common porous materials being used as CO 2 capturer. In this work, saturated fatty amine (octadecylamie,ODA) was evaluated as a potential source of basic sites for CO 2 capture. Both commercial SiO 2 and AC were used as preliminary supports in order to study the effect of loading. The amine-modified samples were characterized using x-ray diffractometer (XRD), attenuated total reflextance/fourier transform infrared spectroscopy (ATR/FTIR), and Brunauer-Emmet-Teller (BET). Reactivity of solid sorbents towards CO 2 was evaluated using isothermal CO 2 adsorption by BET technique. This study shows that the order of CO 2 adsorption capacity by SiO 2 type adsorbents are 25 ODA/SiO 2 > SiO 2 > 15 ODA/SiO 2 > 5 ODA/SiO 2 whereas AC > 5 ODA/AC > 15 ODA/AC > 25 ODA/AC for AC type adsorbents. However, the promotion of ODA compounds on the AC was not improving the CO 2 uptake significantly due to pore blockage and drastic reduction in microporous surface area and pore volume of AC.Index Terms-Adsorption, amine impregnation, CO 2 capture. I. INTRODUCTIONCarbon dioxide is one of green house gases, known as main anthropogenic contributors to climate change which has drawn significant attention to researchers in looking to develop strategies for reducing the CO 2 emissions and concentration. Increasing concentration of CO 2 contributes to global warming and climate changes that give critical effects to environment, infrastructures and human. There were several works reported in reducing CO 2 concentration by capture and separate the CO 2 gas. There are different unit operations such as liquid absorption, cryogenic techniques [6], and selective diffusion through polymer, metallic or ceramic membranes [7].The development of solid sorbents has focused on the modification of solid surfaces with usually having amine compounds. The solid sorbents should have a porous structure to be filled with amine compounds to enable the retention of CO 2 molecules. The commonly used porous solid supports are silica fume [8] [12], and hydrotalcyte [13]. However, application of solid sorbents together with octadecylamine (ODA) as CO 2 capturer is still limited. Selected porous materials for this study are silica dioxide (SiO 2 ) and activated carbon (AC). SiO 2 and AC surfaces will be modified with ODA compounds by impregnation method to develop high dispersion of amine and thus will give better CO 2 adsorption performance. Hence, the objective of this study is to characterize and explore the effect of ODA compounds supported on the surface of SiO 2 and AC towards CO 2 adsorption capacity. II. PROCEDURES AND METHODSSilica-amine adsorbent was prepared by use of wet impregnation. Firstly, commercial silica dioxide, SiO 2 received from Fluka was calcined at 400 °C for 4 hours in air before impregnated with octadecylamine, ODA (ALDRICH ® , 97%). Chloroform, CHCl 3 (SYSTERM ® , 99-99.4%) was added to dissolve the ODA. After stirring for 4 hours in a close system, the mixture was rested for 1 hour before sonicate (S 4000-010 Sonicator 4000). The mixtu...

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Mechanisms and Kinetics for Sorption of CO₂ on Bicontinuous Mesoporous Silica Modified with n-Propylamine

Cited by 262 publications

References 62 publications

Desorption Kinetics and Mechanisms of CO2 on Amine-Based Mesoporous Silica Materials

Desorption Kinetics and Mechanisms of CO2 on Amine-Based Mesoporous Silica Materials

Adsorption of CO2 on silica dioxide catalyst impregnated with various alkylamine

Modification of Porous Materials by Saturated Fatty Amine as CO2 Capturer

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Mechanisms and Kinetics for Sorption of CO2 on Bicontinuous Mesoporous Silica Modified with n-Propylamine

Cited by 262 publications

References 62 publications

Desorption Kinetics and Mechanisms of CO2 on Amine-Based Mesoporous Silica Materials

Desorption Kinetics and Mechanisms of CO2 on Amine-Based Mesoporous Silica Materials

Adsorption of CO2 on silica dioxide catalyst impregnated with various alkylamine

Modification of Porous Materials by Saturated Fatty Amine as CO2 Capturer

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Mechanisms and Kinetics for Sorption of CO₂ on Bicontinuous Mesoporous Silica Modified with n-Propylamine