Optimized cesium and potassium ion-exchanged zeolites A and X granules for biogas upgrading

Narang, Kritika; Fodor, Kristina; Kaiser, Andreas; Akhtar, Farid

doi:10.1039/c8ra08004f

Cited by 14 publications

(17 citation statements)

References 40 publications

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“…The CO 2 uptake rate for the stable cycle was 3.6 mg of CO 2 /g/s and 3.1 mg of CO 2 /g/s for NaX and CaA granules, respectively. The CO 2 adsorption rate was higher than the one previously reported for NaX and CaA binderless beads [43]. Additionally, the granules were intact without any breakage after 5 adsorption-desorption cycles at 4 bar; this further enhanced the usability of freeze granules in the PSA for CO 2 separation.…”

Section: Resultsmentioning

confidence: 57%

“…NaX granules have a higher CO2 uptake than CaA granules, and their corresponding powder zeolites show the same trend of adsorption as shown in Figure 4. Zeolite NaX powders have a higher CO2 uptake capacity than the zeolite CaA powder due to the higher specific BET surface area and pore volume of zeolite NaX [43]. The CO2 uptake capacity at 293 K of NaX and CaA granules is lower than their respective powders as shown in Figure 4.…”

Section: Resultsmentioning

confidence: 97%

“…Furthermore, the CO 2 separation performance was investigated by determining the CO 2 -over-CH 4 selectivity using the Henry's law. NaX granules have a higher CO 2 -over-CH 4 selectivity of 214, whereas CaA granules showed the CO 2 -over-CH 4 selectivity of 172 at 273 K. It is established that selectivity and gas adsorption characteristics of zeolites can be tailored using ion exchange in zeolites [43]. Studies on the cation exchange from Na + to Ca 2+ in the X zeolite, or from Ca 2+ to Na + in the A zeolite have been conducted to tune the gas adsorption capacity and selectivity [47][48][49].…”

Section: Resultsmentioning

confidence: 99%

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Freeze Granulated Zeolites X and A for Biogas Upgrading

Narang

Akhtar

2020

Molecules

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Biogas is a potential renewable energy resource that can reduce the current energy dependency on fossil fuels. The major limitation of utilizing biogas fully in the various applications is the presence of a significant volume fraction of carbon dioxide in biogas. Here, we used adsorption-driven CO2 separation using the most prominent adsorbents, NaX (faujasite) and CaA (Linde Type A) zeolites. The NaX and CaA zeolites were structured into hierarchically porous granules using a low-cost freeze granulation technique to achieve better mass transfer kinetics. The freeze granulation processing parameters and the rheological properties of suspensions were optimized to obtain homogenous granules of NaX and CaA zeolites 2–3 mm in diameter with macroporosity of 77.9% and 68.6%, respectively. The NaX and CaA granules kept their individual morphologies, crystallinities with a CO2 uptake of 5.8 mmol/g and 4 mmol/g, respectively. The CO2 separation performance and the kinetic behavior were estimated by breakthrough experiments, where the NaX zeolite showed a 16% higher CO2 uptake rate than CaA granules with a high mass transfer coefficient, 1.3 m/s, compared to commercial granules, suggesting that freeze-granulated zeolites could be used to improve adsorption kinetics and reduce cycle time for biogas upgrading in the adsorption swing technology.

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Section: Resultsmentioning

confidence: 57%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Freeze Granulated Zeolites X and A for Biogas Upgrading

Narang

Akhtar

2020

Molecules

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“…[ 38 ] This value is similar to that of structured freeze‐cast zeolite A monoliths ( k = 0.3 m s −1 ) with lamellar pores. [ 38,39 ] These results also indicate that, by forming a structured anisotropic material, the aerogels can be beneficially utilized for industrial gas adsorption and separation applications with very low pressure loss.…”

Section: Resultsmentioning

confidence: 86%

Shaping 90 wt% NanoMOFs into Robust Multifunctional Aerogels Using Tailored Bio‐Based Nanofibrils

et al. 2022

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“…The CO 2 adsorption capacity of the obtained zeolite 5A pellet in this research reached a maximum at 3.64 mmol CO 2 /g. It is considered that CO 2 adsorption efficiency of zeolite 5A pellets was higher than commercial zeolite CaA pellet [28] but it was little lower than the CO 2 adsorption efficiency of zeolites CaA bead [29].…”

Section: Effect Of Compression Timementioning

confidence: 98%

Optimization of CO2 Adsorption and Physical Properties for Pelletization of Zeolite 5A

Worathanakul

Sangsuradet

Wongchalerm

et al. 2021

Curr. Appl. Sci. Technol.

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This research investigated the effects of compression force, compression time, and addition of bentonite binder on zeolite 5A pelletization. Carbon dioxide (CO2) adsorption of zeolite 5A pellets was tested in a laboratory-scale packed-bed reactor at 298 K, atmospheric pressure and 2 l/h flow rate. Zeolite 5A pellets were prepared using a pelletization technique at 200-400 MPa compressive force, 5-15 min compression time, and with 0-15% wt. of bentonite binder. The specific surface area and density of zeolite 5A pellets increased with increase of compression force. Compression force led to increase in specific surface area and resulted in an agglomeration of zeolite pellets, making CO2 molecules more difficult to become active sorbent. The addition of bentonite into zeolite 5A pellets with more compression time resulted in the reduction of specific surface area. The compression force and mass fraction of the binder were found to offer significant control over CO2 adsorption capacity. No addition of binder, 200 MPa compression force and 5 min compression time resulted in a maximum CO2 adsorption capacity of 3.64 mmol CO2/g. This research indicated that zeolite 5A pellets have a beneficial effect and high potential as an adsorbent, especially in terms of CO2 adsorption and environmental applications

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Optimized cesium and potassium ion-exchanged zeolites A and X granules for biogas upgrading

Abstract: Ion exchange of binderless zeolite A and X granules leads to high CO2/CH4 selectivity and CO2 uptake capacity.

Cited by 14 publications

References 40 publications

Freeze Granulated Zeolites X and A for Biogas Upgrading

Freeze Granulated Zeolites X and A for Biogas Upgrading

Shaping 90 wt% NanoMOFs into Robust Multifunctional Aerogels Using Tailored Bio‐Based Nanofibrils

Optimization of CO2 Adsorption and Physical Properties for Pelletization of Zeolite 5A

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