Boosting the CO2 capture efficiency through aromatic bridged organosilica membranes

Guo, Meng; Qian, Junming; Xu, Rong; Ren, Xiuxiu; Zhong, Jing; Kanezashi, Masakoto

doi:10.1016/j.memsci.2021.120018

Cited by 15 publications

(8 citation statements)

References 57 publications

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“…In comparison, the gas permeation properties of BTESA-300 and BTESA-500 membranes were studied within the temperature range of 200 °C to 50 °C. The CO 2 permeance experienced a rising trend with a decrease in measurement temperature, which indicated that the CO 2 permeation through the membranes was dominated by the surface diffusion mechanism [ 21 ]. Nevertheless, the N 2 permeation displayed a totally different evolution trend in comparison to the CO 2 permeation.…”

Section: Resultsmentioning

confidence: 99%

“…For BTESA-500 membrane, the N 2 permeance increased as the temperature increased. Different N 2 permeation behaviors showed that the N 2 permeation through BTESA-100 and BTESA-300 membranes was governed by the activated diffusion mechanism and that of BTESA-500 membrane was dominated by the surface diffusion mechanism, respectively [ 21 ]. The enlarged pore sizes or the generated defects attributed to the decomposed acetylene bridges determined the N2 permeation properties of BTESA-500 membranes.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, the BTESE membrane exhibited high CO 2 /N 2 and CO 2 /CH 4 selectivity around 28 and 90, respectively. Nevertheless, the low CO 2 permeance of 1 × 10 −7 mol m −2 s −1 Pa −1 (300 GPU, 1 GPU = 3.348 × 10 −10 mol m −2 s −1 Pa −1 ) still needs to be further improved [ 21 ]. Considering the cost efficiency in practical application, the membranes with CO 2 permeance higher than 1000 GPU and CO 2 /N 2 selectivity larger than 20 can satisfy industrial requirements [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

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Network Structure Engineering of Organosilica Membranes for Enhanced CO2 Capture Performance

Jiang¹,

Guo

2022

Membranes

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The membrane separation process for targeted CO2 capture application has attracted much attention due to the significant advantages of saving energy and reducing consumption. High-performance separation membranes are a key factor in the membrane separation system. In the present study, we conducted a detailed examination of the effect of calcination temperatures on the network structures of organosilica membranes. Bis(triethoxysilyl)acetylene (BTESA) was selected as a precursor for membrane fabrication via the sol-gel strategy. Calcination temperatures affected the silanol density and the membrane pore size, which was evidenced by the characterization of FT-IR, TG, N2 sorption, and molecular size dependent gas permeance. BTESA membrane fabricated at 500 °C showed a loose structure attributed to the decomposed acetylene bridges and featured an ultrahigh CO2 permeance around 15,531 GPU, but low CO2/N2 selectivity of 3.8. BTESA membrane calcined at 100 °C exhibited satisfactory CO2 permeance of 3434 GPU and the CO2/N2 selectivity of 22, displaying great potential for practical CO2 capture application.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Network Structure Engineering of Organosilica Membranes for Enhanced CO2 Capture Performance

Jiang¹,

Guo

2022

Membranes

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“…Membrane-based gas separation processes are gaining a great deal of attention for carbon dioxide capture and separation, natural gas purification, hydrogen recovery, and molecular air filtration. − The primary advantages of membrane technology involve minimizing global energy demand and mitigating the effect of greenhouse gases from the consumption of conventional fossil energy resources, which is generally based on cryogenic distillation, solvent extraction, and evaporation. , Several studies have reported gas separation via the use of polymeric membranes such as polyaniline, polyimide, and polypyrrole and also via the use of porous inorganic membranes including zeolites, metal–organic frameworks (MOFs), carbon molecular sieve (CMS), and organosilica. Polymeric membranes have the advantage of flexible low-cost fabrication, but challenges include swelling, plasticization, and poor temperature and chemical stability .…”

Section: Introductionmentioning

confidence: 99%

Metal-Induced Aminosilica Rigidity Improves Highly Permeable Microporous Membranes via Different Types of Pendant Precursors

Anggarini

Nagasawa

et al. 2022

ACS Appl. Mater. Interfaces

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In this study, nickel-doped aminosilica membranes containing pendant groups were prepared with 3-aminopropyltriethoxysilane (APTES), trimethoxy[3-(methylamino)propyl]silane (MAPTS), 3 N,N-dimethyl aminopropyltrimethoxysilane (DAPTMS), N-[3-(trimethoxysilylpropyl]ethylene diamine (TMSPED), and 1-[3-(trimethoxysilyl)propyl] urea (TMSPU). Differences in the structures of terminal amine ligands significantly contributed to the formation of a coordinated structural assembly. Ultraviolet–visible spectroscopy (UV–vis), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and N2 adsorption isotherms revealed that short and rigid pendant amino groups successfully coordinated with nickel to produce subnanopores in the membranes, while an ion-exchange interaction was suggested for longer and sterically hindered aminosilica precursors. Moreover, the basicity of amine precursors affected the affinity of ligands for the development of a coordinated network. A pristine aminosilica membrane showed low levels of H2 permeance that range from 0.1 to 0.5 × 10–6 mol m–2 s–1 Pa–1 with a H2/N2 permeance ratio that ranges from 15 to 100. On the contrary, nickel coordination increased the H2 permeance to 0.1–3.0 × 10–6 mol m–2 s–1 Pa–1 with H2/N2 permeance ratios that range from 10 to 68, which indicates the formation of a microporous structure and enlargement of pore sizes. The strong level of coordination affinity between nickel ions and amine groups induced rearrangement of the flexible pendant chain into a more rigid structure.

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“…To control the network stability and permeation properties of microporous organosilica (pendant– and bridged–type) membranes, two commonly used “spacer” and “template” methods were employed via an adjustment of the organic chain between two Si atoms (Si–R–Si) and/or the terminal organic (O–Si–R) chain [ 19 , 20 ]. Kanezashi et al [ 21 ] reported a series of organosilica network structures consisting of various carbon numbers (C 1 –C 8 ) and concluded that the network pore size regressed using the modified gas-translation model (mG–T), enlarged by an increase in the carbon number between two Si atoms.…”

Section: Introductionmentioning

confidence: 99%

The Effect of C/Si Ratio and Fluorine Doping on the Gas Permeation Properties of Pendant-Type and Bridged-Type Organosilica Membranes

et al. 2022

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A series of pendant–type alkoxysilane structures with various carbon numbers (C1–C8) were used to fabricate sol–gel derived organosilica membranes to evaluate the effects of the C/Si ratio and fluorine doping. Initially, this investigation was focused on the effect that carbon-linking (pendant–type) units exert on a microporous structure and how this affects the gas-permeation properties of pendant–type organosilica membranes. Gas permeation results were compared with those of bridged–type organosilica membranes (C1–C8). Network pore size evaluation was conducted based on the selectivity of H2/N2 and the activation energy (Ep) of H2 permeation. Consequently, Ep (H2) was increased as the C/Si ratio increased from C1 to C8, which could have been due to the aggregation of pendant side chains that occupied the available micropore channel space and resulted in the reduced pore size. By comparison, these permeation results indicate that pendant–type organosilica membranes showed a somewhat loose network structure in comparison with bridged–type organosilica membranes by following the lower values of activation energies (Ep). Subsequently, we also evaluated the effect that fluorine doping (NH4F) exerts on pendant−type [methytriethoxysilane (MTES), propyltrimethoxysilane (PTMS)] and bridged-type [1,2–bis(triethoxysilyl)methane (BTESM) bis(triethoxysilyl)propane (BTESP)] organosilica structures with similar carbon numbers (C1 and C3). The gas-permeation properties of F–doped pendant network structures revealed values for pore size, H2/N2 selectivity, and Ep (H2) that were comparable to those of pristine organosilica membranes. This could be ascribed to the pendant side chains, which might have hindered the effectiveness of fluorine in pendant–type organosilica structures. The F–doped bridged–type organosilica (BTESM and BTESP) membranes, on the other hand, exhibited a looser network formation as the fluorine concentration increased.

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Boosting the CO2 capture efficiency through aromatic bridged organosilica membranes

Cited by 15 publications

References 57 publications

Network Structure Engineering of Organosilica Membranes for Enhanced CO2 Capture Performance

Network Structure Engineering of Organosilica Membranes for Enhanced CO2 Capture Performance

Metal-Induced Aminosilica Rigidity Improves Highly Permeable Microporous Membranes via Different Types of Pendant Precursors

The Effect of C/Si Ratio and Fluorine Doping on the Gas Permeation Properties of Pendant-Type and Bridged-Type Organosilica Membranes

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