Adsorption of CO2, CH4, and N2in Activated Carbon Honeycomb Monolith

Ribeiro, Rui P.P.L.; Sauer, Ticiane Pokrywiecki; Lopes, Filipe V. S.; Moreira, Regina de Fátima Peralta Muniz; Grande, Carlos A.; Rodrigues, Alı́rio E.

doi:10.1021/je800161m

Cited by 119 publications

(72 citation statements)

References 21 publications

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“…31 P and 13 C CP MAS NMR spectra were obtained at 75.468 MHz on a General Electric NMR Instrument model GN-300 equipped with a Doty Scientific 7 mm MAS probe. 13 C NMR chemical shifts were referenced to the downfield line of adamantine at 38.55 p.p.m., and for 31 P NMR, the chemical shift of 85% H 3 PO 4 was set to zero using external reference standards. The formation of the microporous framework structures were studied by nitrogen and carbon dioxide sorption using an Autosorb-1 instrument (Quantachrome).…”

Section: Methodsmentioning

confidence: 99%

“…To investigate the structure of the materials in more detail, we have studied the 31 P MAS NMR and 13 C CP MAS NMR spectra of the PECONFs. Figure 3a shows the 13 that the electron-rich aromatic DAB unit was incorporated into the PECONF materials.…”

Section: Mas Nmr Spectroscopymentioning

confidence: 99%

“…Figure 3a shows the 13 that the electron-rich aromatic DAB unit was incorporated into the PECONF materials. An additional signal was observed around 39 p.p.m., which can be assigned to residual DMSO that was used as the solvent for the synthesis.…”

Section: Mas Nmr Spectroscopymentioning

confidence: 99%

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Porous covalent electron-rich organonitridic frameworks as highly selective sorbents for methane and carbon dioxide

2011

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Carbon dioxide capture from point sources like coal-fired power plants is considered to be a solution for stabilizing the Co 2 level in the atmosphere to avoid global warming. methane is an important energy source that is often highly diluted by nitrogen in natural gas. For the separation of Co 2 and CH 4 from n 2 in flue gas and natural gas, respectively, sorbents with high and reversible gas uptake, high gas selectivity, good chemical and thermal stability, and low cost are desired. Here we report the synthesis and Co 2 , CH 4 , and n 2 adsorption properties of hierarchically porous electron-rich covalent organonitridic frameworks (PEConFs). These were prepared by simple condensation reactions between inexpensive, commercially available nitridic and electron-rich aromatic building units. The PEConF materials exhibit high and reversible Co 2 and CH 4 uptake and exceptional selectivities of these gases over n 2 . The materials do not oxidize in air up to temperature of 400 °C.

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Section: Methodsmentioning

confidence: 99%

Section: Mas Nmr Spectroscopymentioning

confidence: 99%

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Porous covalent electron-rich organonitridic frameworks as highly selective sorbents for methane and carbon dioxide

2011

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“…The authors further recommend the utilization of such adsorbers in fuel reforming apparatus for generating hydrogen fuel for hydrogen-powered fuel cells, or in fuel delivery systems for supplying low-sulphur fuel to combustion engines, or in other systems supporting combustion processes requiring the use of low-sulphur fuel. Adsorption of CO 2 , CH 4 and N 2 in activated carbon honeycomb monoliths was performed by Ribeiro et al [45]. This investigation aimed at the generation of bio-methane from renewable fuels.…”

Section: Monolithic Adsorbentsmentioning

confidence: 99%

Structured adsorbents in gas separation processes

Rezaei

Webley

2010

Separation and Purification Technology

221

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a b s t r a c tIn this review, novel structured adsorbents for gas separation processes are discussed. General requirements are elucidated and illustrated with respect to specific structures such as monoliths, foams, laminates, and fabric structures. Geometrical parameters of adsorbents which affect the system performance are identified and discussed. It is clear that opportunities for improvement and optimization of adsorptive gas separation processes should include the development of improved structured adsorbents. These novel structures can fulfil many of the requirements of advanced gas separation processes such as enhanced mass transfer, reduced pressure drop, and improved thermal management.

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“…They gained attention in various applications including catalyst supports [47][48] , porous media burners [49][50] , heat exchangers 51 , ion exchange 52 and adsorption 53 mainly due to the properties these materials offer, such as high surface area, high permeability, low density, low specific heat, and high thermal insulation. diameter, is one of the most predominate characteristic parameters that is related to the pore density of foam materials size that is usually expressed as pore count "pore per inch" (PPI) and is between 5 to 100 PPI in commercial foams.…”

Section: Foamsmentioning

confidence: 99%

Novel adsorbents for natural gas separation and purification

Arami-Niya¹

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This thesis explores novel adsorbents for separation of three different types of gas mixtures found in liquified natural gas processes (a) CO2 from CH4 and N2, (b) CH4 from N2, and (c) helium from N2 and CH4. These separations represent challenging operations in natural gas processing because the conventional technologies to remove CO2 such as amine absorption units, reject N2 and recovery helium by cryogenic distillation are capital and energy intensive. Cyclic adsorption processes such as pressure swing adsorption (PSA) have potential as alternative technologies to reduce equipment costs and improve energy efficiency in liquified natural gas (LNG) production facilities, especially for small-scale plants. However, there are several challenges related to the development of adsorbents required to advance PSA technologies for natural gas processing. These include the development of adsorbents with excellent selectivity, low-pressure drops, and low production costs.Chapters 4 and 5 of the thesis report novel carbon foam monoliths that have several potential advantages such as lower pressure drops, better heat transfer properties, lower void fractions and higher mechanical strength in fixed-bed adsorption processes over pellets or granular adsorbents. In Chapter 4 I report pitch-derived carbon foam monoliths, and in this chapter I investigated the effects of using coal as a filler particle and the amount of potassium hydroxide on the stability of tar pitch during the foaming process, the product's density, and the micropore structure. These pitch-derived carbon monoliths featured an open-cell structure and a well-developed microporosity that presented a BET specific surface area of 1044 m 2 .g -1 . At 298 K and pressures close to 3500 kPa the adsorption capacities of the carbon monolith prepared with 50 %wt coal to pitch were 7.398 mmol.g -1 CO2, 5.049 mmol.g -1 CH4, and 3.516 mmol.g -1 N2.The second type of carbon foam developed in this thesis was a monolithic carbon foam with an open cellular structure that was synthesized from banana peel using a soft-template method with zinc nitrate, furfural, and 2-aminophenol (Chapter 5). I extended the experimental methods to investigate the effects of (a) carbonization temperature and (b) post-carbonization CO2 activation to enhance the microporosity of the carbon foams as adsorbents for CO2 capture. The CO2-activated carbon foams featured BET surface areas up to 1426 m 2 .g -1 . The effect of surface chemistry and N-containing functional groups on the CO2 uptake was also investigated and it was showed that both nitrogen functional groups and microporosity are critical parameters in equilibrium CO2 absorption of the carbon foams. To evaluate the potential of these carbon foams as adsorbents for gas separation, the adsorption capacity of the carbon foams for CO2 and N2 were measured by a gravimetric sorption. At 298 K and pressures of 3990 kPa, the carbon foam synthesized at 1273 K in CO2 adsorbed 9.21 mmol.g -1 of CO2 and 3.29 mmol.g -1 of N2.II Although the synthes...

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Adsorption of CO₂, CH₄, and N₂in Activated Carbon Honeycomb Monolith

Cited by 119 publications

References 21 publications

Porous covalent electron-rich organonitridic frameworks as highly selective sorbents for methane and carbon dioxide

Porous covalent electron-rich organonitridic frameworks as highly selective sorbents for methane and carbon dioxide

Structured adsorbents in gas separation processes

Novel adsorbents for natural gas separation and purification

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