Water adsorption and hydrothermal stability of CHA zeolites with different Si/Al ratios and compensating cations

Moura, P. A. S.; Rodríguez‐Aguado, Elena; Maia, Débora Aline Soares; Melo, Dárley Carrijo de; Singh, Ranjeet; Valencia, Susana; Webley, Paul A.; Rey, Fernando; Bastos‐Neto, Moises; Rodríguez‐Castellón, Enrique; Azevedo, Diana Cristina Silva de

doi:10.1016/j.cattod.2021.11.042

Cited by 16 publications

(12 citation statements)

References 28 publications

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“…Compared to AAS, ICP-AES is especially suitable for refractory elements, such as Si and Al, which perform poorly by flame AAS. 52,112,164 However, analysis of Si and Al by AAS and ICP-AES requires the complete dissolution of zeolite samples into solution, which usually involves toxic hydrofluoric acid. This is the disadvantage of the AAS and ICP-AES.…”

Section: Methods For Determining the Si/al Ratios Of Zeolitesmentioning

confidence: 99%

“…Thus, the Si/Al ratios of both the cationic and protonic zeolites have significant influence on water adsorption. 164,212 The higher content of Al in the framework, the more cations are required to balance the charge and thus higher water uptake is expected. 164 For example, Na + balanced CHA zeolite with a Si/Al ratio of 2 exhibited a significant adsorption capacity for water.…”

Section: Adsorption/separationmentioning

confidence: 99%

“…164,212 The higher content of Al in the framework, the more cations are required to balance the charge and thus higher water uptake is expected. 164 For example, Na + balanced CHA zeolite with a Si/Al ratio of 2 exhibited a significant adsorption capacity for water. However, dealuminated Y zeolite with a Si/Al ratio of >200 is highly hydrophobic.…”

Section: Adsorption/separationmentioning

confidence: 99%

“…However, dealuminated Y zeolite with a Si/Al ratio of >200 is highly hydrophobic. 113,164 Unlike the adsorption of polar H 2 O in zeolites, the air separation by zeolites relies on the difference of the stronger quadrupole interaction between the cations and the N 2 versus O 2 . 213,214 Thus, the zeolite with a large capacity of cations would be beneficial for air separation.…”

Section: Adsorption/separationmentioning

confidence: 99%

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Regulation of the Si/Al ratios and Al distributions of zeolites and their impact on properties

Gao

2023

Chem. Sci.

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Section: Methods For Determining the Si/al Ratios Of Zeolitesmentioning

confidence: 99%

Section: Adsorption/separationmentioning

confidence: 99%

Section: Adsorption/separationmentioning

confidence: 99%

Section: Adsorption/separationmentioning

confidence: 99%

See 2 more Smart Citations

Regulation of the Si/Al ratios and Al distributions of zeolites and their impact on properties

Gao

2023

Chem. Sci.

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“…Water adsorption at lower relative humidity was favored while using a BEA with a lower Si/Al ratio. On the other hand, the hydrothermal stability of zeolites is reduced when the Si/Al ratio is lowered . This is because the thermal resistance of zeolites is proportional to the Si content in the framework, Si–O–Si bonds are more thermally stable than Si–O–Al bonds.…”

Section: Water Adsorption By Different Classes Of Porous Materialsmentioning

confidence: 99%

Water Vapor Adsorption by Porous Materials: From Chemistry to Practical Applications

et al. 2022

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In recent years, the deployment of chemically stable physisorbents in various water sorption-related applications has received significant attention. Depending on their structural features, different types of porous sorbents manifest distinct shapes of water sorption isotherms. The translation of water sorption profiles of adsorbents into appropriate practical applications is yet to be established. This Review gives an overview of the water adsorption studies conducted on different hydrolytically stable porous solids selected from different classes of solid-state materials (organic, inorganic, and hybrid materials). Brief analyses of the water sorption behavior and the relations to materials' intrinsic structural features are made. Based on adsorbents' observed water sorption characteristics, the prospects of their practical/commercial deployment in chosen sectors are also commented. The criteria for using porous adsorbents in specific water-related technologies, which can help guide the design and assembly of suitable water adsorbents, are also reviewed. In addition, the challenges that need to be overcome in developing efficient water vapor adsorbents for a given application are also discussed.

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Hydrothermal stability of Na-LTA shaped with clay binder

Moreno,

da S. Pereira,

Azevedo

et al. 2023

Adsorption

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Water adsorption and hydrothermal stability of CHA zeolites with different Si/Al ratios and compensating cations

Cited by 16 publications

References 28 publications

Regulation of the Si/Al ratios and Al distributions of zeolites and their impact on properties

Regulation of the Si/Al ratios and Al distributions of zeolites and their impact on properties

Water Vapor Adsorption by Porous Materials: From Chemistry to Practical Applications

Hydrothermal stability of Na-LTA shaped with clay binder

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