Optimum structured adsorbents for gas separation processes

Rezaei, Fateme; Webley, Paul A.

doi:10.1016/j.ces.2009.08.029

Cited by 163 publications

(158 citation statements)

References 22 publications

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“…For laminate, cloth and monolith structures, in order to maintain a sufficient surface area and hence improved kinetic properties, the wall thickness and spacing should be kept small. Thinner wall thickness means shorter diffusion path but on the other hand, lower adsorbent loading associated with thinner walls will result in insufficient adsorbent density [14]. The same argument is valid for adsorbent voidage.…”

Section: Trade-off Of Propertiesmentioning

confidence: 64%

“…It is of interest however to attempt to derive criteria for the assessment of these competing structures for an application. Optimization of adsorbent structures for gas separations was recently studied by Rezaei and Webley [14]. The key results from that study are discussed here.…”

Section: Criteria For the Assessment Of Adsorbent Structurementioning

confidence: 99%

“…In fact, more detailed analysis reveals that axial dispersion is usually negligible even in monolithic and laminate structures [14]. Of course maldistribution and channelling are more likely in monolith systems and laminates and require attention to detail in the fabrication process.…”

Section: Mass Transfers Characteristicsmentioning

confidence: 99%

“…A more detailed assessment of the impact of external film resistance has recently been conducted by Rezaei and Webley [14].…”

Section: Mass Transfers Characteristicsmentioning

confidence: 99%

“…The maximum specific productivity as a function of velocity therefore depends strongly on how much MTZ and pressure drop are negatively affected by high velocities. Our earlier study showed that different adsorbent structures achieve their optimum performance at different velocities with structured adsorbents most suited to regions of high velocity where they display their superiority [14].…”

Section: Criteria For the Assessment Of Adsorbent Structurementioning

confidence: 99%

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Structured adsorbents in gas separation processes

Rezaei

Webley

2010

Separation and Purification Technology

230

209

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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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Section: Trade-off Of Propertiesmentioning

confidence: 64%

Section: Criteria For the Assessment Of Adsorbent Structurementioning

confidence: 99%

Section: Mass Transfers Characteristicsmentioning

confidence: 99%

“…A more detailed assessment of the impact of external film resistance has recently been conducted by Rezaei and Webley [14].…”

Section: Mass Transfers Characteristicsmentioning

confidence: 99%

Section: Criteria For the Assessment Of Adsorbent Structurementioning

confidence: 99%

See 3 more Smart Citations

Structured adsorbents in gas separation processes

Rezaei

Webley

2010

Separation and Purification Technology

230

209

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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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Polymer‐Sorbent Direct Air Capture Contactors with Complex Geometries 3D‐Printed via Templated Phase Inversion

Kim,

Holmes,

Wang

et al. 2024

Adv Funct Materials

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Low‐cost direct air capture (DAC) systems require efficient gas–solid contactors. These contactors provide rapid rates of heat and mass transport with minimal pressure drops. Triply periodic minimal surfaces (TPMS) are a class of geometries that are shown to have heat transfer properties that exceed those of other geometries, and these benefits are expected to manifest in mass transfer as well due to the analogies between heat and mass transfer. However, creating TPMS contactors is difficult using conventional manufacturing techniques such as injection molding. Non‐solvent‐induced phase separation (NIPS) of a polymeric ink containing the adsorbent is one way to construct adsorption contactors with excellent mass transport rates, but contactors have to date only been fabricated in simple geometries (e.g., films, fibers). This study demonstrates that NIPS of polymeric inks occurs within a simultaneously‐dissolving, water‐soluble, 3D‐printed template. This templated phase inversion (TPI) technique can create seemingly unlimited macroscopic architectures, including TPMS contactors, using a variety of potential DAC adsorbents, including zeolite, silica, activated carbon, and metal–organic frameworks. SEM, micro‐computed tomography, and nitrogen adsorption experiments reveal the microscopic pore structures and macroscopic geometries of the resulting sorbent contactors. TPMS DAC contactors with poly(ethyleneimine)/silica adsorbents are shown to have CO2 capture performances that rival or exceed other contactor geometries.

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Optimum structured adsorbents for gas separation processes

Cited by 163 publications

References 22 publications

Structured adsorbents in gas separation processes

Structured adsorbents in gas separation processes

Granulation and Shaping of Metal-Organic Frameworks

Polymer‐Sorbent Direct Air Capture Contactors with Complex Geometries 3D‐Printed via Templated Phase Inversion

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