Efficient CO2 sorbents based on silica foam with ultra-large mesopores

Qi, Genggeng; Fu, Liling; Choi, Brian Hyun; Giannelis, Emmanuel P.

doi:10.1039/c2ee21394j

Cited by 151 publications

(159 citation statements)

References 51 publications

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“…25.5 wt. % (75°C and 1 bar) with fast adsorption kinetics was observed (Qi et al, 2012). Similar capacities were achieved from the same group by using mesoporous SiO 2 capsules as a support (Qi et al, 2011), the measured pore volume of the capsules was not high, however, the hollow cores provided abundant space for the accommodation of amines, leading to the exceptionally high adsorption capacities.…”

Section: Effect Of Supportsupporting

confidence: 58%

Solid Adsorbents for Low-Temperature CO2 Capture with Low-Energy Penalties Leading to More Effective Integrated Solutions for Power Generation and Industrial Processes

et al. 2015

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CO 2 capture represents the key technology for CO 2 reduction within the framework of CO 2 capture, utilization, and storage (CCUS). In fact, the implementation of CO 2 capture extends far beyond CCUS since it will link the CO 2 emission and recycling sectors, and when renewables are used to provide necessary energy input, CO 2 capture would enable a profitable zero-or even negative-emitting and integrated energy-chemical solution. To this end, highly efficient CO 2 capture technologies are needed, and adsorption using solid adsorbents has the potential to be one of the ideal options. Currently, the greatest challenge in this area is the development of adsorbents with high performance that balances a range of optimization-needed factors, those including costs, efficiency, and engineering feasibility. In this review, recent advances on the development of carbon-based and immobilized organic amines-based CO 2 adsorbents are summarized, the selection of these particular categories of materials is because they are among the most developed low-temperature (<100°C) CO 2 adsorbents up to date, which showed important potential for practical deployment at pilot-scale in the near future. Preparation protocols, adsorption behaviors as well as pros and cons of each type of the adsorbents are presented, it was concluded that encouraging results have been achieved already, however, the development of more effective adsorbents for CO 2 capture remains challenging and further innovations in the design and synthesis of adsorbents are needed.Keywords: CCUS, CO 2 capture, adsorption, energy, material science INTRODUCTION CO 2 CAPTURE AND AN INTEGRATED ENERGY-CHEMICAL SOLUTIONThe atmospheric CO 2 concentration now exceeds 400 ppm (CO2Now.org, 2014), and its continuous increase is believed to be the major factor leading to global warming and climatic change (Crowley, 2000;Held and Soden, 2000;Patz et al., 2005). Kaya et al. and Hoffert et al. have quantified net CO 2 emissions in terms of population, economic activity, and energy-related factors using Eq. 1 (Kaya, 1995;Hoffert et al., 1998).where C is the net CO 2 emission, P is population, GDP is the gross domestic product that is used here as an indicator of economyrelated factor, and E is energy production. Therefore, GDP/P is the Per capita GDP, and E/GDP can be regarded as the energy intensity during production that is closely related to the efficiency of energy utilization. The last term, C/E, represents the carbon intensity during energy production. As for the development of the human society and life quality, it is improper to limit population and production, which means there is no solution to CO 2 reduction from the first and second term in Eq. 1. On the other hand, increase in the energy production/utilization efficiency and control of the carbon footprint during energy processes are the major strategies for CO 2 sequestration (third and fourth term in Eq. 1). The complete decarbonization of energy is believed to be the ultimate solution for the long-term sustainability, ...

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Section: Effect Of Supportsupporting

confidence: 58%

Solid Adsorbents for Low-Temperature CO2 Capture with Low-Energy Penalties Leading to More Effective Integrated Solutions for Power Generation and Industrial Processes

et al. 2015

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“…The mesoporous silica (MPS) support was prepared as reported previously [9,10,33]. Briefly 3.0 g of P123 was dissolved in acetic acid (3.0 g).…”

Section: Preparation Of the Polyethyleneimine Pei-10k/mesoporous Silimentioning

confidence: 99%

“…In most of these sorbents, the inorganic substrate was usually in the mesoporous form, where it provided both substantial pore volume and great surface area onto and into which the active organic groups were incorporated [9][10][11][12]. The most widely inorganic mesoporous support used till now is mesoporous silica [9][10][11][12][13][14][15]. Among the adsorption techniques, capturing CO 2 on amine immobilized on solid sorbents has been considered as a great promising approach [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…So far, amines immobilized on mesoporous silica (MPS) have shown to have the highest CO 2 adsorptivity, high desorption rate, negligent corrosion problems, and low consumption of energy during regeneration [18,19]. Several amines supported mesoporous silica have been synthesized and studied [5,[9][10][11]15,18,20]. Furthermore, when high molecular weight polyethyleneimine (PEI) is employed the volatilization and/or decomposition are expected to be minimal because of the relatively high melting temperature of such a high molecular weight material.…”

Section: Introductionmentioning

confidence: 99%

“…One subset is based on an inorganicorganic hybrid sorbents [6][7][8]. In most of these sorbents, the inorganic substrate was usually in the mesoporous form, where it provided both substantial pore volume and great surface area onto and into which the active organic groups were incorporated [9][10][11][12]. The most widely inorganic mesoporous support used till now is mesoporous silica [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermodynamics of CO2 Adsorption on Polyethyleneimine Mesoporous Silica and Activated Carbon

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et al. 2017

J Phys Chem Biophys

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An Ultrahigh Pore Volume Drives Up the Amine Stability and Cyclic CO₂ Capacity of a Solid‐Amine@Carbon Sorbent

2015

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Therefore, for practical implementation of solid-amine sorbents, it is critical to enhance sorption working capacity, amine stability over multiple regeneration cycles, and particle size of the porous support. In principle, these issues can be resolved if a suitable support monolith can be developed, which show both high surface area and high pore volume, to offer high amine loading and binding within the 3D interconnected network pores. [ 16,[22][23][24] Though tetraethylenepentamine (TEPA) is preferred over polyethyleneimine (PEI) due to its favorable CO 2 uptake with a high amine concentration, the volatilization of TEPA is a serious issue compared with PEI. [ 11,[18][19][20] Also if found suitable, a low-cost support is preferred. Here, we show a highly effi cient CO 2 scrubber with TEPA impregnated in an MOF-derived carbon monolith (MDCM) that exhibits simultaneously high specifi c surface area (SSA ≈ 2700 m 2 g −1 ) and ultrahigh hierarchical pore volume ( V p ≈ 5.35 cm 3 g −1 ). This is the fi rst demonstration of such kind of porous supports that is capable of accommodating a record level of amine and maintaining the amine stability within the pores over several cycles. The system constantly shows over 200 mg g −1 of CO 2 adsorption capacity at simulated fl ue gas and practical conditions (humidifi ed, 15% CO 2 balanced with N 2 , uptake at 75 °C and desorption at 100 °C) over several repeated cycles, outperforming any known sorbents reported to date. It can be regarded as a new generation of CO 2 super scrubber. To strengthen our fi ndings the results are comparatively discussed with amine@activated graphene oxide (ActGO) ( V p ≈ 1.9 cm 3 g −1 ) with small pore size distribution (PSD) of hierarchical pores and other literature on amine@silica with well-defi ned uniform pores. Figure 1 shows the synthesis approaches and the porous structural characteristics of amine-loaded porous supports. Extraordinary advantage of the ultrahigh pore volume MDCM over other traditional MOF/activated carbon can be seen.

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Efficient CO2 sorbents based on silica foam with ultra-large mesopores

Cited by 151 publications

References 51 publications

Solid Adsorbents for Low-Temperature CO2 Capture with Low-Energy Penalties Leading to More Effective Integrated Solutions for Power Generation and Industrial Processes

Solid Adsorbents for Low-Temperature CO2 Capture with Low-Energy Penalties Leading to More Effective Integrated Solutions for Power Generation and Industrial Processes

Thermodynamics of CO2 Adsorption on Polyethyleneimine Mesoporous Silica and Activated Carbon

An Ultrahigh Pore Volume Drives Up the Amine Stability and Cyclic CO₂ Capacity of a Solid‐Amine@Carbon Sorbent

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Efficient CO2 sorbents based on silica foam with ultra-large mesopores

Cited by 151 publications

References 51 publications

Solid Adsorbents for Low-Temperature CO2 Capture with Low-Energy Penalties Leading to More Effective Integrated Solutions for Power Generation and Industrial Processes

Solid Adsorbents for Low-Temperature CO2 Capture with Low-Energy Penalties Leading to More Effective Integrated Solutions for Power Generation and Industrial Processes

Thermodynamics of CO2 Adsorption on Polyethyleneimine Mesoporous Silica and Activated Carbon

An Ultrahigh Pore Volume Drives Up the Amine Stability and Cyclic CO2 Capacity of a Solid‐Amine@Carbon Sorbent

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An Ultrahigh Pore Volume Drives Up the Amine Stability and Cyclic CO₂ Capacity of a Solid‐Amine@Carbon Sorbent