Adsorption equilibria of CO2 and CH4 in cation-exchanged zeolites 13X

Moura, P. A. S.; Bezerra, Diôgo Pereira; Vilarrasa-García, Enrique; Bastos‐Neto, Moises; Azevedo, Diana C. S.

doi:10.1007/s10450-015-9738-9

Cited by 90 publications

(47 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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]. S. Chen et al have recently shown the increase in the CO 2 uptake after the ion exchange of Na + cations with Ca 2+ cations at different concentrations [50].…”

Section: Resultsmentioning

confidence: 99%

Freeze Granulated Zeolites X and A for Biogas Upgrading

Narang

Akhtar

2020

Molecules

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Freeze Granulated Zeolites X and A for Biogas Upgrading

Narang

Akhtar

2020

Molecules

View full text Add to dashboard Cite

show abstract

“…Pelletization of Ca‐LSX with a binder followed by high temperature calcination will be performed first, which is to be followed by the Li ion exchange and mild calcination steps as described above. Ion exchange of zeolites in their pelletized form is practiced in laboratories and, in fact, occurs in industrial wastewater treatment such as radioactive waste treatment…”

Section: Resultsmentioning

confidence: 99%

Mixed‐cation LiCa‐LSX zeolite with minimum lithium for air separation

Epiepang

Yang

et al. 2017

AIChE Journal

View full text Add to dashboard Cite

The aim of this work was to reduce/minimize Li in Li-LSX by replacing the 70% Li 1 cations in Li-LSX that are bonded to the interior or inaccessible sites which are not used for adsorption. Thus, mixed-cation LiCa-LSX containing minimum lithium were prepared by exchanging small fractions of Li 1 into Ca-LSX, followed by dehydration under mild conditions to avoid migration/equilibration of Li cations. Comparisons of adsorption isotherms of N 2 /O 2 and heats of adsorption for the LiCa-LSX samples with that for pure-cation Li-LSX and Ca-LSX provided strong evidence that significant amounts of these Li cations indeed remained on the exposed sites (SIII). The mixed-cation LiCa-LSX samples were compared against the pure-cation Ca-LSX and Li-LSX based on their performance for oxygen production by PSA, via model simulation. The results showed that the mixed-cation LiCa-LSX samples yielded significantly higher O 2 product productivities at the same product purity and recovery than their pure-cation precursor (Ca-LSX).

show abstract

“…The influence of zeolite compensating cations nature in the interaction with CO 2 was widely reported in the literature ,. In this way, larger cations, due to their polarizing properties, induce higher basicity on the framework oxygens ,. In addition, carbon dioxide molecules interaction with zeolites, which can involve both oxygens and cations, was clearly affected by the cation size and even its specific location in the structure ,.…”

Section: Relevant Properties Of Zeolites For Co2 Methanationmentioning

confidence: 99%

Tuning Zeolite Properties towards CO₂ Methanation: An Overview

et al. 2019

View full text Add to dashboard Cite

This work provides a short review of the literature concerning the utilization of zeolites as supports for CO2 methanation catalysts. Indeed, the application of these materials in carbon dioxide hydrogenation into methane has led to considerably relevant performances according to the literature, being zeolite‐based catalysts more active and selective than commercial materials reported. Considering the well‐known zeolite features and the possibility to finely modulate its properties, inducing relevant changes on the adsorbed metal species and in the CO2 activation ability of the catalyst, potentially interesting catalytic properties can be generated also towards this transformation. Possible correlations between the characteristics of these materials, found as relevant for CO2 methanation, and the catalytic properties will be then presented and discussed.

show abstract

Adsorption equilibria of CO2 and CH4 in cation-exchanged zeolites 13X

Cited by 90 publications

References 19 publications

Freeze Granulated Zeolites X and A for Biogas Upgrading

Freeze Granulated Zeolites X and A for Biogas Upgrading

Mixed‐cation LiCa‐LSX zeolite with minimum lithium for air separation

Tuning Zeolite Properties towards CO₂ Methanation: An Overview

Contact Info

Product

Resources

About

Adsorption equilibria of CO2 and CH4 in cation-exchanged zeolites 13X

Cited by 90 publications

References 19 publications

Freeze Granulated Zeolites X and A for Biogas Upgrading

Freeze Granulated Zeolites X and A for Biogas Upgrading

Mixed‐cation LiCa‐LSX zeolite with minimum lithium for air separation

Tuning Zeolite Properties towards CO2 Methanation: An Overview

Contact Info

Product

Resources

About

Tuning Zeolite Properties towards CO₂ Methanation: An Overview