Structured adsorbents in gas separation processes

Rezaei, Fateme; Webley, Paul A.

doi:10.1016/j.seppur.2009.10.004

Cited by 221 publications

(212 citation statements)

References 78 publications

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“…In packed reactors and adsorbent towers some of the potential advantages of structured foam and honey-comb type monoliths over random packings (e.g. beads, extruded pellets, and granules) include lower bed pressure drops and higher packing densities of the catalytic or adsorption sites in a vessel [2][3][4]. Foam-like carbon monoliths with open cellular structures may also provide better radial mixing of fluids in packed beds than the typical linear macro channels in honeycomb monolith, and any enhanced heat and mass transfer in carbon foams could be utilized to reduce contact times in reactors or pressure swing adsorption systems.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 8 summaries the isosteric heat of adsorption results. The heats of adsorption were in the ranges 22 -26 kJ/mol for CO 2 at loadings of 2 -3 mmol/g, 21 -22.7 kJ/mol for N 2 at loadings of 0.1 -0.6 mmol/g, and 6 -8 kJ/mol for CH 4 at loadings of 0.2 -1.2 mmol/g. The values of CO 2 isosteric heat of adsorption on ACD18-053 in this study similar to the range of reported values for other activated carbons [46] and isoteric heats of adsorption for N 2 are also similar to other reported ranges for similar pressures and coverages [47].…”

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confidence: 98%

“…To determine q st values we fitted a high-order polynomial equation to each isotherms to obtain an expression for Q as a function of p, and used these fitted isotherm equations to interpolate for values of p at a given Q for each temperature so that ln(P) Q could be plotted against 1/T. Then with these plots, q st was obtained by linear regression of Equation 4. Figure 8 summaries the isosteric heat of adsorption results.…”

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confidence: 99%

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The preparation of activated carbon discs from tar pitch and coal powder for adsorption of CO 2 , CH 4 and N 2

Gao

Rufford

et al. 2017

Microporous and Mesoporous Materials

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We used a pitch foaming process to prepare high surface area activated carbon discs ACD with a relatively high mechanical strength (4.3 MPa) from mixtures of tar pitch and coal powders, with potassium hydroxide as a chemical activator. The two primary parameters investigated in this study were the amount of nitric acid used in the pitch pre-treatment and the size of the coal particles (0 -53 µm, 150 -250 µm, and 355 -550 µm). The pre-treatment of the pitch was observed to be critical in the production of the carbon discs and in this study the preferred ratio of 15 M nitric acid to pitch in weight was 17/100. The coal size of 0 -53 µm produced the activated carbon discs with the highest gas adsorption capacity, which we attribute to the stabilization of the pitch foaming process. Equilibrium adsorption capacities of CO 2 , N 2 , and CH 4 on the carbons were measured by a gravimetric sorption method at pressures up to 3500 kPa. At 298 K the adsorption capacities of carbon foam disc prepared with coal particle size of 0 -53 µm and pitch pre-treated with 18 ml HNO 3 per 100 g pitch were 3.08 mol/kg N 2 , 5.48 mol/kg CH 4 and 8.88 mol/kg CO 2 at about 3500 kPa.

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Section: Introductionmentioning

confidence: 99%

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confidence: 98%

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confidence: 99%

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The preparation of activated carbon discs from tar pitch and coal powder for adsorption of CO 2 , CH 4 and N 2

Gao

Rufford

et al. 2017

Microporous and Mesoporous Materials

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“…8,33,35 The combination of an optimized temperature and pressure during PCP has resulted in structured monoliths of AlPO 4 -17 and AlPO 4 -53 with a high CO 2 capture capacity and a relatively high mechanical strength ( Table 1). The CO 2 and N 2 uptake on these monoliths of AlPO 4 -17 and AlPO 4 -53 (Fig.…”

Section: 32-34mentioning

confidence: 99%

“…A large pressure drop can result in clogs or blockages in some gas separation processes. 8,9 Typically, structured adsorbents are produced by shaping a mixture of the porous powder with an inorganic and organic binder into a body of the desired geometry. [10][11][12] The powder body is thermally treated to increase the mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

Aluminophosphate monoliths with high CO₂-over-N₂ selectivity and CO₂ capture capacity

et al. 2014

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Aluminophosphate monoliths with high CO 2 -over-N 2 selectivity and CO 2 capture capacity. and N 2 adsorption data indicated that the AlPO 4 -53 monoliths had an extraordinarily high CO 2 -over-N 2 selectivity from a binary gas mixture of 15 mol% CO 2 and 85 mol% N 2 . The estimated CO 2 capture capacity of AlPO 4 -17 and AlPO 4 -53 monoliths in a typical pressure swing adsorption (PSA) process at 20 C was higher than that of the commonly used zeolite 13X granules. Under cyclic sorption conditions, AlPO 4 -17 and AlPO 4 -53 monoliths were regenerated by lowering the pressure of CO 2 . Regeneration was done without application of heat, which would regenerate them to their full capacity for CO 2 adsorption. RSC

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Granulation and Shaping of Metal-Organic Frameworks

Lee

Valekar

Hwang

et al. 2016

The Chemistry of Metal-Organic Frameworks: Synthesis, Characterization, and Applications

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IntroductionShaping and forming of metal-organic frameworks (MOFs) are essential for practical applications like adsorption/separation and catalysis, which require structuring of the nano-/microcrystalline fine powders of MOFs into a macroscopic body [1][2][3][4][5][6][7]. When a process for catalysis or adsorptive separation is scaled up to the pilot or commercial scale, the form in which an active catalyst or adsorbent is used is decisive in determining the ultimate performance of the unit [8][9][10]. In this respect, the size and shape of the target material require a compromise between minimizing pore diffusion effects in the material particles, for which small particles are necessary, and minimizing the pressure drop across the reactor, which requires large particle sizes [11]. The shaped MOFs should maintain excellent performance shown by the original powder forms based on their high porosity, crystallinity, and flexibility [12]. Therefore, the proper selection of the shaping or forming process is important in the MOF research field for chemical engineering and industrial applications. As the shaping methods are often proprietary and often more of an art than a science, the exact procedures are rarely disclosed.The shaped MOFs can also be prepared using techniques (Figure 18.1) that have typically been utilized for synthesizing catalysts and adsorbents from porous materials, such as pressing, extrusion, granulation and spray drying, foaming, casting, and coating. Well-shaped bodies have been produced in the forms of pellets, tablets, monoliths, granules, and spheres [13][14][15][16]. However, to utilize shaped MOFs successfully for industrial applications, they should have sufficient mechanical strength, chemical stability, attrition resistance, maximal bulk density, and minimal wasted space in the storage vessel [17][18][19][20][21][22][23][24]. As the performance of shaped MOFs for industrial or large-scale applications depends on several parameters, including the mass-and heat-transfer properties, gas diffusion kinetics, pressure drop across material, mechanical strength, and volumetric efficiency, achieving high mechanical integrity of the structured MOF is critical to the performance in real engineering processes. The Chemistry of Metal-Organic Frameworks: Synthesis, Characterization, and Applications, First Edition. Edited by Stefan Kaskel.

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Structured adsorbents in gas separation processes

Cited by 221 publications

References 78 publications

The preparation of activated carbon discs from tar pitch and coal powder for adsorption of CO 2 , CH 4 and N 2

The preparation of activated carbon discs from tar pitch and coal powder for adsorption of CO 2 , CH 4 and N 2

Aluminophosphate monoliths with high CO₂-over-N₂ selectivity and CO₂ capture capacity

Granulation and Shaping of Metal-Organic Frameworks

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Structured adsorbents in gas separation processes

Cited by 221 publications

References 78 publications

The preparation of activated carbon discs from tar pitch and coal powder for adsorption of CO 2 , CH 4 and N 2

The preparation of activated carbon discs from tar pitch and coal powder for adsorption of CO 2 , CH 4 and N 2

Aluminophosphate monoliths with high CO2-over-N2 selectivity and CO2 capture capacity

Granulation and Shaping of Metal-Organic Frameworks

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Aluminophosphate monoliths with high CO₂-over-N₂ selectivity and CO₂ capture capacity