Influence of temperature and high-pressure on the adsorption behavior of scCO2 on MCM-41 and SBA-15

Reiser, Sarah; Türk, Michael

doi:10.1016/j.supflu.2018.10.011

Cited by 20 publications

(7 citation statements)

References 67 publications

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“…For SAB-15, the Q st value was around 20 KJ/mol. The results are consistent with reported values obtained by Reiser 23 . A slight decrease in the Q st is noted before steadying over the range of adsorbed moles.…”

Section: Heats Of Adsorptionsupporting

confidence: 93%

“…The experimental data of the CO 2 excess adsorption capacity on the three selected sorbents are given in Fig. 7 at a pressure range from 1-30 bar and at three different temperatures (283, 298, 318 K), further elaboration on excess vs absolute adsorption amounts is given elsewhere 23 .…”

Section: Ftir Ftir Spectroscopy Assists In Understanding the Interacmentioning

confidence: 99%

“…In IGCC for example, operating under high pressure and temperature is required to eliminate the need to cool the stream down or adjust the pressure adding to the complexity and cost of the process. Ullah 3 reported on the adsorption behavior of SBA-15, a mesoporous silica, for pressures reaching 200 bar and three various temperatures while more recently Reiser 23 reported on the influence of high temperature and pressure (25 MPa) at two temperatures for SBA-15. To the best of our knowledge, reports of high pressure or elevated temperature for SIFSIX-3-Ni and NbOFFIVE-1-Ni are not reported and are considered here as they are known to exhibit benchmark selectivity for CO 2 .…”

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confidence: 99%

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Solid Sorbents as a Retrofit Technology for CO2 Removal from Natural Gas Under High Pressure and Temperature Conditions

Khraisheh

Almomani

Walker

2020

Sci Rep

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The capture of CO2 under high pressure and temperature is challenging and is required in a number for industrial applications including natural gas processing. In this work, we examine the use of benchmark hybrid ultraporous materials HUMs for their potential use in CO2 adsorption processes under high-pressure conditions, with three varying temperatures (283, 298 and 318 K). NbOFFOVE-1-Ni and SIFSIX-3-Ni were the selected HUMs given their established superior CO2 capacity under low pressure (0–1 bar). Both are microporous with highly ordered crystalline structures as compared to the mesoporous hexagonal silica (Santa Barbara Anhydrous-15 (SBA-15)). SBA-15 was previously tested for both low and high-pressure applications and can serve as a benchmark in this study. Sorbent characterization using XRD, SEM, FTIR and N2 adsorption were conducted to assure the purity and structure of the sorbents. TGA analysis were conducted to establish the thermal stability of the sorbents under various temperatures. High-pressure CO2 adsorption was conducted from 0–35 bar using magnetic suspension balance (Rubotherm). Although the SBA-15 had the highest surface (527 m3/g) are of the three adsorbents, the CO2 adsorption capacity (0.42 mmol/g) was an order of magnitude less than the studies HUMs with SIFSIX-3-Ni having 2.6 mmol/g, NbOFFIVE-1-Ni achieving 2.5 mmol/g at 298 K. Multistage adsorption isotherms were obtained at different pressures. In addition, results indicate that electrostatics in HUMs are most effective at improving isosteric heat of adsorption Qst and CO2 uptake. Higher temperatures had negative effect on adsorption capacity for the HUMs and SBA-15 at pressures between 7–9 bar. In SAB-15 the effect of temperature is reversed in what is known as a cross over phenomena.

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Section: Heats Of Adsorptionsupporting

confidence: 93%

Section: Ftir Ftir Spectroscopy Assists In Understanding the Interacmentioning

confidence: 99%

mentioning

confidence: 99%

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Solid Sorbents as a Retrofit Technology for CO2 Removal from Natural Gas Under High Pressure and Temperature Conditions

Khraisheh

Almomani

Walker

2020

Sci Rep

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“…Supercritical adsorption experiments reported in the literature on both crystalline and ordered porous materials provide direct evidence of adsorption behaviour, which can be ascribed to a characteristic distribution of micro-and meso-pores. Some of the traditional adsorbent morphologies that have been investigated include: zeolite crystals, where adsorption is mainly within the micropores [29]; mesoporous silicas, such as Controlled Pore Glass (CPG) [33,41], SBA-15 [9,40] and MCM-41 [31]; and mesoporous carbons [1,36]. These ordered porous solids can be considered as the building blocks for more complex porous structures, including hierarchical adsorbents [37] or disordered materials (e.g.…”

Section: Towards a Classification?mentioning

confidence: 99%

Measurement and interpretation of unary supercritical gas adsorption isotherms in micro-mesoporous solids

2021

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Gas adsorption at high pressures in porous solids is commonly quantified in terms of the excess amount adsorbed. Despite the wide spectrum of adsorbent morphologies available, the analysis of excess adsorption isotherms has mostly focused on microporous materials and the role of mesoporosity remains largely unexplored. Here, we present supercritical CO2 adsorption isotherms measured at $$T=308$$ T = 308 K in the pressure range $$p=0.02{-}21$$ p = 0.02 - 21 MPa on three adsorbents with distinct fractions of microporosity, $$\phi_2$$ ϕ 2 , namely a microporous metal-organic framework ($$\phi_2=70$$ ϕ 2 = 70 %), a micro-mesoporous zeolite ($$\phi_2=38$$ ϕ 2 = 38 %) and a mesoporous carbon ($$\phi_2<0.1$$ ϕ 2 < 0.1 %). The results are compared systematically in terms of excess and net adsorption relative to two distinct reference states–the space filled with gas in the presence/absence of adsorbent–that are defined from two separate experiments using helium as the probing gas. We discuss the inherent difficulties in extracting from the supercritical adsorption isotherms quantitative information on the properties of the adsorbed phase (its density or volume), because of the nonuniform distribution of the latter within and across the different classes of pore sizes. Yet, the data clearly reveal pore-size dependent adsorption behaviour, which can be used to identify characteristic types of isotherm and to complement the information obtained using the more traditional textural analysis by physisorption.

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“…Since the discovery of MCM-41, researchers have taken an interest in its synthesis and application because of its large internal surface, high thermal and hydrothermal stability, possibility of controlling the pore dimension, and potential acidity. Indeed, MCM-41 has been widely studied in adsorption [3][4][5][6], CO 2 capture [7][8][9], catalysis [10][11][12], drug delivery [13,14], and biomedical applications [15] in the last five years. Traditional mesoporous silica materials were synthesized with sodium silicate, tetraethyl orthosilicate, or tetramethyl orthosilicate as silicon sources.…”

Section: Introductionmentioning

confidence: 99%

Simple Synthesis and Characterization of Hexagonal and Ordered Al–MCM–41 from Natural Perlite

Chen

et al. 2019

Minerals

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Silica reagents are expensive and toxic for use in the synthesis of mesoporous silica materials. It is imperative to take an interest in green silicon sources. In this paper, we report the synthesis of hexagonal and ordered aluminum-containing mesoporous silica materials (Al–MCM–41) from natural perlite mineral without addition of silica or aluminum reagents. A pretreatment process involving acid leaching, alkali leaching, and strongly acidic cation exchange resins treatment was critical to obtain silicon and aluminum sources from natural perlite mineral. The Al–MCM–41 material was synthesized via a hydrothermal reaction with hexadecyl trimethyl ammonium bromide (CTAB) as the template and subsequent calcination. The resulting mesophase had a hexagonal and ordered mesoporous structure, confirmed by small-angle X-ray diffraction (SAXRD) and transmission electron microscopy (TEM). Al–MCM–41 material had a high Brunauer–Emmet–Teller (BET) surface area of 1024 m2/g, pore volume of 0.72 cm3/g and an average pore diameter of 2.8 nm with a pore size distribution centered at 2.5 nm. The thermal behavior of the as-synthesized samples during calcination was investigated by thermogravimetry (TG) and differential thermogravimetry (DTG) analysis. The Al–MCM–41 material showed a negative surface charge in aqueous solution with the pH value ranging from 2 to 13. The variations of chemical structures from natural perlite to Al–MCM–41 were traced by wide-angle X-ray diffraction (WAXRD) and Fourier-transform infrared spectroscopy (FTIR). A proposed mechanism for the synthesis of hexagonal and ordered mesoporous silica materials from natural perlite is discussed.

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Influence of temperature and high-pressure on the adsorption behavior of scCO2 on MCM-41 and SBA-15

Cited by 20 publications

References 67 publications

Solid Sorbents as a Retrofit Technology for CO2 Removal from Natural Gas Under High Pressure and Temperature Conditions

Solid Sorbents as a Retrofit Technology for CO2 Removal from Natural Gas Under High Pressure and Temperature Conditions

Measurement and interpretation of unary supercritical gas adsorption isotherms in micro-mesoporous solids

Simple Synthesis and Characterization of Hexagonal and Ordered Al–MCM–41 from Natural Perlite

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