Amine-Grafted MCM-48 and Silica Xerogel as Superior Sorbents for Acidic Gas Removal from Natural Gas

Huang, Helen Y.; Yang, Ralph T.; Chinn, Daniel; Munson, Curtis L.

doi:10.1021/ie020440u

Cited by 647 publications

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“…CO 2 capture has attracted attention due to the potential to trap and sequester large amounts of CO 2 from concentrated sources such as power plants. Traditional technologies in capturing CO 2 include absorption by aqueous amines. 1 However, utilization of this process is energy intensive and expensive when used for large volumes of dilute gas, such as flue gas.…”

mentioning

confidence: 99%

“…1 However, utilization of this process is energy intensive and expensive when used for large volumes of dilute gas, such as flue gas. 2 This is primarily due to the high heat capacity of water and use of temperature swings to induce CO 2 desorption. Many types of amine-modified silica materials have been reported (e.g., amine-tethered silica materials, 3 amines impregnated into porous silicas, 4,5 etc.)…”

mentioning

confidence: 99%

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Designing Adsorbents for CO₂ Capture from Flue Gas-Hyperbranched Aminosilicas Capable of Capturing CO₂ Reversibly

et al. 2008

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Due to the increasing CO 2 concentration in the atmosphere, contemporary research has focused on ways to slow or stop this trend. CO 2 capture has attracted attention due to the potential to trap and sequester large amounts of CO 2 from concentrated sources such as power plants. Traditional technologies in capturing CO 2 include absorption by aqueous amines. 1 However, utilization of this process is energy intensive and expensive when used for large volumes of dilute gas, such as flue gas. 2 This is primarily due to the high heat capacity of water and use of temperature swings to induce CO 2 desorption. Many types of amine-modified silica materials have been reported (e.g., amine-tethered silica materials, 3 amines impregnated into porous silicas, 4,5 etc.) as possible solid adsorbents for CO 2 capture from flue gas streams. However, these materials generally suffer from low CO 2 capacities or lack stability over many cycles, especially when amines are physisorbed onto the support. Therefore, it is advantageous to synthesize an organic/ inorganic hybrid amine-tethered silica material with high amine loadings (>6 mmol/g) capable of reversibly binding CO 2 rather than employing physisorbed, impregnated adsorbents that may be unstable after several cycles. Here we describe the synthesis of a covalently tethered hyperbranched aminosilica (HAS) material 6-8 capable of binding CO 2 reversibly from simulated flue gas, and we compare its CO 2 capacity with those of other reported solid amine adsorbents (Scheme 1). We conceived of these HAS materials as practical CO 2 adsorbents due to their simple synthesis, covalent inorganic-organic linkage, and low cost. The HAS material has the highest fully regenerable CO 2 capacity for a covalently supported adsorbent under simulated flue gas conditions. The synthesis of HAS was performed via a one-step reaction between aziridine and the silica surface. 6 As previously reported on silica wafers, the surface silanols initiated aziridine polymerization off the surface. 6 Due to low surface areas, hybrid aminosilica materials constructed on silica wafers are impractical adsorbents. However, the formation of hybrid aminosilicas on high surface area mesoporous silica materials 7,8 can lead to materials capable of reversibly binding CO 2 with substantial capacities (>2 mmol CO 2 / g). The aziridine monomer was added to SBA-15 dispersed in a toluene solution with catalytic amounts of acetic acid and stirred at room temperature in a glass pressure reaction vessel. The resulting HAS material (SBA-HA) was washed extensively to remove physisorbed aziridine or unbound oligomer from the surface. The organic loading of the grafted hybrid aminosilica used here was determined via elemental analysis as 7.0 mmol N/g material.For these studies, the hybrid aminosilica was uniformly dispersed in sand and tested in a fixed bed flow system. The adsorbent/sand mixture allowed for decreased heat effects and reproducible flow through the bed. The SBA-HA material was analyzed for CO 2 capture at 25°C and 75...

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Designing Adsorbents for CO₂ Capture from Flue Gas-Hyperbranched Aminosilicas Capable of Capturing CO₂ Reversibly

et al. 2008

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“…Relationship between micropore volume and amount of CO 2 adsorbed on activated carbons under dry conditions. (Na et al, 2001;Cinke et al, 2003;Huang et al, 2003;Hiyoshi et al, 2005;Drese et al, 2009).…”

Section: Dynamic Co 2 Adsorptionmentioning

confidence: 99%

Facile Preparation of Nitrogen-Doped Activated Carbon for Carbon Dioxide Adsorption

Chen

Peng

Lin

et al. 2014

Aerosol Air Qual. Res.

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Nitrogen-doped activated carbons with high surface areas obtained from resorcinol and formaldehyde resins were evaluated as CO 2 adsorbents in a simulated flue gas stream under anhydrous and humid conditions. These carbons were prepared using two approaches, namely ammonia treatment without nitric acid pre-oxidation and amination after preoxidation. The pre-oxidation of activated carbons considerably enhanced the nitrogen incorporation during the amination process. The amination temperature affects the content and type of nitrogen incorporated onto the carbon surface, as determined by X-ray photoelectron spectroscopy, which enhances the specific adsorbent-adsorbate interaction for CO 2 in humid conditions. The presence of H 2 O in the feed gas significantly decreased CO 2 adsorption for a very low nitrogen content of virgin activated carbon. A sample prepared via the amination of pre-oxidized carbon at 700°C (NORF700) exhibited excellent tolerance to moisture and the highest CO 2 capacity of 2.10 mmol/g in a 7% CO 2 /83% N 2 /10% H 2 O wet stream at 50°C and 130 kPa. The high performance of NORF700 was ascribed to its high surface area, adequate micropore volume, and high amounts of pyrindinic-like and pyrrole-like nitrogen species. The results indicate that nitric acid preoxidation followed by ammonia treatment at 700°C is an appropriate process for preparing adsorbents for CO 2 separation in post-combustion applications.

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“…The bands at 2940 and 1530 cm Ϫ1 can be assigned to C-H stretching from CH 2 CH 2 CH 2 -NH 2 groups and N-H vibration, respectively. 37,38 The presence of the C-H stretching band at 2940 cm Ϫ1 and the N-H vibration band at 1530 cm Ϫ1 as well as the decrease in the ϪOH intensity at 3480 and 1632 cm Ϫ1 after the modification reflect the grafting of EDA on the surface of MSP. The impregnation of amine functional groups to the MSP surface provides chemical sites for CO 2 adsorption.…”

Section: Characterizations Of Sorbentsmentioning

confidence: 99%

Adsorption of Carbon Dioxide from Gas Streams via Mesoporous Spherical-Silica Particles

Bai

et al. 2010

Journal of the Air & Waste Management Association

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A relatively new mesoporous silica sorbent for environmental protection applications (i.e., mesoporous spherical-silica particles [MSPs]), was modified by N- [3-(trimethoxysilyl)propyl]ethylenediamine (EDA) solution and was tested for its potential in the separation of carbon dioxide (CO 2 ) from flue gas. The CO 2 adsorption capacity of MSP and MSP(EDA) increased with temperature from 20 to 60°C but decreased with temperature from 60 to 100°C. The mechanism of CO 2 adsorption on both samples is mainly attributed to physical interaction regardless of temperature change. The MSP(EDA) have good adsorption performance as compared with EDA-modified zeolite or granular activated carbon conducted in this study and many types of silica sorbents reported in the literature. The cyclic CO 2 adsorption showed that spent MSP(EDA) could be effectively regenerated at 120°C for 25 min and CO 2 adsorption capacity of MSP(EDA) was preserved during 16 cycles of adsorption and thermal regeneration. These results suggests that MSP(EDA) are efficient CO 2 sorbents and can be stably used in the prolonged cyclic operation. INTRODUCTIONThe carbon dioxide (CO 2 ) capture and storage (CCS) technologies from flue gas are considered to be completely feasible means to lessen the global warming issue. 1 Various CO 2 capture technologies, including absorption, adsorption, cryogenics, membranes, and so forth, have been investigated. 2 Among them, the absorption-regeneration technology has been recognized as the most matured process so far, with the amine-based or ammonia-based absorption processes receiving the greatest interest. [3][4][5][6][7] However, because the energy penalty to regenerate liquid amine or ammonia in the absorption process is high due to the high heat capacity of liquid amine/ammonia and large amount of water, 2 other technologies are being investigated throughout the world. The Intergovernmental Panel on Climate Change (IPCC) special report concluded that the design of a full-scale adsorption process might be feasible. 8 Possible CO 2 sorbents investigated in the literature include activated carbon, 9 -11 X-type zeolites, 12,13 carbon nanotubes (CNTs), 11,14,15 SBA-15 mesoporous silica sorbents, 16 -19 and mesoporous molecular sieve MCM-41. 20 -23 Mesoporous spherical-silica particles (MSPs), which were modified from the MCM-41 materials, 24 are a relatively new sorbent for environmental protection applications. 25 The MSPs possess advantages of much faster preparation time, higher packing density, and lower pressure drop than MCM-41 because of their well -defined spherical shape. 26 These advantages make MSPs more practical

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Amine-Grafted MCM-48 and Silica Xerogel as Superior Sorbents for Acidic Gas Removal from Natural Gas

Cited by 647 publications

References 32 publications

Designing Adsorbents for CO₂ Capture from Flue Gas-Hyperbranched Aminosilicas Capable of Capturing CO₂ Reversibly

Designing Adsorbents for CO₂ Capture from Flue Gas-Hyperbranched Aminosilicas Capable of Capturing CO₂ Reversibly

Facile Preparation of Nitrogen-Doped Activated Carbon for Carbon Dioxide Adsorption

Adsorption of Carbon Dioxide from Gas Streams via Mesoporous Spherical-Silica Particles

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Amine-Grafted MCM-48 and Silica Xerogel as Superior Sorbents for Acidic Gas Removal from Natural Gas

Cited by 647 publications

References 32 publications

Designing Adsorbents for CO2 Capture from Flue Gas-Hyperbranched Aminosilicas Capable of Capturing CO2 Reversibly

Designing Adsorbents for CO2 Capture from Flue Gas-Hyperbranched Aminosilicas Capable of Capturing CO2 Reversibly

Facile Preparation of Nitrogen-Doped Activated Carbon for Carbon Dioxide Adsorption

Adsorption of Carbon Dioxide from Gas Streams via Mesoporous Spherical-Silica Particles

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Designing Adsorbents for CO₂ Capture from Flue Gas-Hyperbranched Aminosilicas Capable of Capturing CO₂ Reversibly

Designing Adsorbents for CO₂ Capture from Flue Gas-Hyperbranched Aminosilicas Capable of Capturing CO₂ Reversibly