Polyethyleneimine and macrocyclic polyamine silica gels acting as carbon dioxide absorbents

Tsuda, Tetsuo; Fujiwara, Tsuyoshi

doi:10.1039/c39920001659

Cited by 75 publications

(65 citation statements)

References 4 publications

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“…[19,[23][24][25]27] We tried to do the same; first cyclam was entrapped and then efforts to complex it with Ni 2 + were performed. Even under extreme conditions (two weeks reflux in methanol and tenfold excess of the nickel ion) the solid matrix did not change its color.…”

Section: Resultsmentioning

confidence: 99%

“…[17] Cyclam (1,4,8,11-tetraazacyclotetradecane)-and its K + and Pb 2 + complexes-have been incorporated within silica matrices by the sol-gel process by means of a biphasic method. [23,24] In addition cyclam-containing monophasic hybrid materials have also been obtained including complexes with Cu 2 + , Co 2 + , Eu 3 + as well as derivatives bearing three hydrolysable RSiX 3 groups (X = OEt, H). [24][25][26] This study reports the first entrapment of nickel com 2 + )-by the biphasic sol-gel process.…”

Section: A C H T U N G T R E N N U N G (H 2 O) 2 ]mentioning

confidence: 98%

“…Keywords: electron exchange column · nickel · N ligands · redox reactions · sol-gel processes · macrocyclic ligands plex to a solution of the precursors [19][20][21][22][23] at mild conditions applying the biphasic method, or by covalent binding the ligand to the preocuser and then complex it before or after the sol-gel process, the monophasic method. [16][17][18][19][20][21][22][23][24][25] In the end of the process the entrapped complex retains most of its physical and chemical properties.…”

Section: A C H T U N G T R E N N U N G (H 2 O) 2 ]mentioning

confidence: 99%

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Electron Exchange Columns through Entrapment of a Nickel Cyclam in a Sol–Gel Matrix

Lavi

Burg

Maimon

et al. 2011

Chemistry A European J

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An electron exchange column (analogous to ion exchange columns) was developed using the unique redox properties of the nickel-tetraazamacrocyclic complexes (nickel cyclam [Ni(II)L(1)](2+)) and nickel-trans-III-meso-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane, ([Ni(II)L(2)](2+)), and the physical and chemical stability of the ceramic materials using the sol-gel process to entrap the complexes. The entrapment by the biphasic sol-gel method is based on non-covalent bonds between the matrix and the complex; therefore the main problem was leaching. Parameters controlling the leaching were investigated. Redox cycles with the reducing agent ascorbic acid, and persulfate as the oxidizing agent were performed.

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Section: Resultsmentioning

confidence: 99%

Section: A C H T U N G T R E N N U N G (H 2 O) 2 ]mentioning

confidence: 98%

Section: A C H T U N G T R E N N U N G (H 2 O) 2 ]mentioning

confidence: 99%

See 1 more Smart Citation

Electron Exchange Columns through Entrapment of a Nickel Cyclam in a Sol–Gel Matrix

Lavi

Burg

Maimon

et al. 2011

Chemistry A European J

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“…Silica supported amines were first used for CO 2 capture by Tsuda in 1992. [203,204] Amorphous silica gels were created by cocondensation of various amine-containing silanes and used for CO 2 capture under dry conditions. Leal reported the first use of amine-functionalized mesoporous silicas for CO 2 adsorption in 1995.…”

Section: Organic and Organic-inorganic Hybrid Adsorbentsmentioning

confidence: 99%

Adsorbent Materials for Carbon Dioxide Capture from Large Anthropogenic Point Sources

2009

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Since the time of the industrial revolution, the atmospheric CO(2) concentration has risen by nearly 35 % to its current level of 383 ppm. The increased carbon dioxide concentration in the atmosphere has been suggested to be a leading contributor to global climate change. To slow the increase, reductions in anthropogenic CO(2) emissions are necessary. Large emission point sources, such as fossil-fuel-based power generation facilities, are the first targets for these reductions. A benchmark, mature technology for the separation of dilute CO(2) from gas streams is via absorption with aqueous amines. However, the use of solid adsorbents is now being widely considered as an alternative, potentially less-energy-intensive separation technology. This Review describes the CO(2) adsorption behavior of several different classes of solid carbon dioxide adsorbents, including zeolites, activated carbons, calcium oxides, hydrotalcites, organic-inorganic hybrids, and metal-organic frameworks. These adsorbents are evaluated in terms of their equilibrium CO(2) capacities as well as other important parameters such as adsorption-desorption kinetics, operating windows, stability, and regenerability. The scope of currently available CO(2) adsorbents and their critical properties that will ultimately affect their incorporation into large-scale separation processes is presented.

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“…This has most often been achieved by binding amines to oxides via the use of silane chemistry or via preparation of polymeric supports with amine-containing side chains. The first Class 2 amine adsorbent was reported by Tsuda in 1992, [68,69] and the largest single body of work on these materials has been reported by Sayari. [10,[25][26][27][28][29][30][31] Class 3 adsorbents are based on porous supports upon which aminopolymers are polymerized in situ, starting from an amine-containing monomer.…”

mentioning

confidence: 98%

Steam‐Stripping for Regeneration of Supported Amine‐Based CO₂ Adsorbents

et al. 2010

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The world continues to rely heavily on energy supplied by fossil fuels, and the forecast for future energy supply and demand does not indicate that fossil fuel use will diminish substantially in the coming years. The use of these energy resources releases huge amounts of CO 2 into the atmosphere every year and there is increased pressure throughout the world to limit these releases as a consequence of the impact of CO 2 on global climate change. A primary method to limit the release of CO 2 is to trap it at its release point (carbon capture) for storage via one of several potential storage technologies (sequestration).[1] A key roadblock is the development of cost-effective CO 2 capture/separation technologies, because these represent the majority of the costs in oceanic or geologic sequestration scenarios.[2] In capturing CO 2 for beneficial uses, such as feeding algae farms for biofuel production, the capture costs represent the entire cost of the CO 2 supply.The current benchmark method for CO 2 capture from gas streams uses aqueous amine solutions (e.g., ca. 40 % monoethanolamine and ca. 60 % water) to absorb CO 2 , and this approach has been suggested for CO 2 capture from power plant effluents.[3] In parallel, solid adsorbents based on supported amines have been evaluated and show promising CO 2 adsorption properties. Among the various classes of solid CO 2 adsorbents, supported amines have many promising features, such as operation at low temperatures (ambient-120 8C). In addition, they have strong CO 2 -sorbent interactions (50-105 kJ mol À1 ), acting as unique, low-temperature chemisorbants.[4] In contrast, most other low-temperature adsorbents such as zeolites, carbons, and (some) metal-organic frameworks (MOFs) rely on weaker physisorption interactions, making water, a common component in flue gas, out-compete CO 2 for adsorption cites in many cases. Indeed, there are over 70 publications in the open literature that explore the CO 2 -adsorption properties of supported amine adsorbents. [2, However, to be a practical CO 2 sorbent, the cost-effective regeneration of the material must be demonstrated. Unfortunately, the singular focus of the academic community to date has been on design of high capacity adsorbents, with nearly all published studies focusing entirely on the capture step. [4] Adsorbents are routinely shown to be at least partly regenerable, but almost always via temperature swing with an inert gas purge, which ultimately does not result in a separation.[75] Of course, this regeneration method is entirely impractical in a real process and it is used in the laboratory simply for convenience. Despite this, it is noteworthy that nearly all previous published research, including our own, has not effectively concentrated the CO 2 , or performed a useful separation. Thus, a critical missing link in the development of supported amine CO 2 -adsorbents are studies of practical desorption processes.Supported amine CO 2 sorbents are most effectively regenerated in a temperature swing process, as signif...

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Polyethyleneimine and macrocyclic polyamine silica gels acting as carbon dioxide absorbents

Cited by 75 publications

References 4 publications

Electron Exchange Columns through Entrapment of a Nickel Cyclam in a Sol–Gel Matrix

Electron Exchange Columns through Entrapment of a Nickel Cyclam in a Sol–Gel Matrix

Adsorbent Materials for Carbon Dioxide Capture from Large Anthropogenic Point Sources

Steam‐Stripping for Regeneration of Supported Amine‐Based CO₂ Adsorbents

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Polyethyleneimine and macrocyclic polyamine silica gels acting as carbon dioxide absorbents

Cited by 75 publications

References 4 publications

Electron Exchange Columns through Entrapment of a Nickel Cyclam in a Sol–Gel Matrix

Electron Exchange Columns through Entrapment of a Nickel Cyclam in a Sol–Gel Matrix

Adsorbent Materials for Carbon Dioxide Capture from Large Anthropogenic Point Sources

Steam‐Stripping for Regeneration of Supported Amine‐Based CO2 Adsorbents

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Steam‐Stripping for Regeneration of Supported Amine‐Based CO₂ Adsorbents