4.6 Article

Interplay between alkali-metal cations and silanol sites in nanosized CHA zeolite and implications for CO2 adsorption

Related references

Note: Only part of the references are listed.
Article Green & Sustainable Science & Technology

Altering the Atomic Order in Nanosized CHA Zeolites by Postsynthetic Silylation Treatment

Sajjad Ghojavand et al.

Summary: This study presents a new post-synthetic hydrothermal approach for simultaneous dealumination and silylation of zeolite nanocrystals. By adjusting the acidity and concentration of the silica modifier during post-synthesis treatment, nanosized chabazite (CHA) type zeolite with Si/Al ratios up to 4 can be obtained. The effect of acidity during the post-synthetic silylation treatment at different pH values is investigated. The approach reported here can be applied to fine-tune the structural features of other zeolite types.

ADVANCED SUSTAINABLE SYSTEMS (2023)

Review Chemistry, Multidisciplinary

Gating effect for gas adsorption in microporous materials-mechanisms and applications

Kaifei Chen et al.

Summary: In the past two decades, various microporous materials have been developed as effective gas adsorbents. The regulation of pore accessibility in microporous materials has been extensively studied to control the admission and release of guest molecules. This review focuses on the mechanisms of the gating effect, which is caused by structural variations induced by host-guest interactions or external stimuli. The temperature-regulated gating effect is emphasized, as it plays a key role in regulating guest admission. Molecular simulations can provide insight into the atomic-scale gate opening/closing transitions and enable the construction of quantitative models for describing gated adsorption behavior. The gating effect in porous materials has been widely applied in gas separation and shows great potential for gas storage and sensing applications.

CHEMICAL SOCIETY REVIEWS (2022)

Article Chemistry, Applied

CO2 capture and CO2/CH4 separation by silicas with controlled porosity and functionality

Saphir Venet et al.

Summary: Microporous, mesoporous, and hydrophobic silica materials with high specific surface area were synthesized by an easy and cost-effective sol-gel method. The effect of pore size and water content on gas adsorption and separation was investigated. The study identified the optimal silica material with the highest CO2 adsorption capacity and separation performance.

MICROPOROUS AND MESOPOROUS MATERIALS (2022)

Article Chemistry, Applied

CO2 adsorption capacities of amine-functionalized microporous silica nanoparticles

Eduardo J. Cueto-Diaz et al.

Summary: Efforts to capture CO2 have become more intense due to the impact of climate change on ecosystems and biodiversity. This study focuses on developing different methods for CO2 sequestration and investigates the influence of functional chemical groups on CO2 adsorption.

REACTIVE & FUNCTIONAL POLYMERS (2022)

Article Chemistry, Inorganic & Nuclear

The challenge of silanol species characterization in zeolites

Florent Dubray et al.

Summary: This article investigates the factors influencing the silanol species in silica-based materials and proposes guidelines for evaluating them using spectroscopic techniques.

INORGANIC CHEMISTRY FRONTIERS (2022)

Article Nanoscience & Nanotechnology

Alkali Metal Cations Influence the CO2 Adsorption Capacity of Nanosized Chabazite: Modeling vs Experiment

Sajjad Ghojavand et al.

Summary: The CO2 adsorption behavior of nanosized chabazite (CHA) containing different compositions of extra-framework alkali metal cations (Na+, K+, Cs+) was investigated. The experimental results were in good agreement with the theoretical modeling, except for the Cs+-containing nanosized CHA sample. The FTIR study revealed that CO2 adsorbed mainly physically on all samples, with Na-CHA exhibiting significant micropore volume.

ACS APPLIED NANO MATERIALS (2022)

Article Chemistry, Applied

Superacidity and spectral signatures of hydroxyl groups in zeolites

Georgi N. Vayssilov et al.

Summary: This research investigated the acidity of Bronsted acid sites (BAS) and silanols in zeolite nanoparticles. It was found that the acidity of hydroxyls in zeolites is significantly higher than in the gas phase. However, the acidity of hydroxyls cannot be estimated based on the spectral characteristics.

MICROPOROUS AND MESOPOROUS MATERIALS (2022)

Article Chemistry, Multidisciplinary

The Origin of Selective Adsorption of CO2 on Merlinoite Zeolites

Hyun June Choi et al.

Summary: The CO2 adsorption behavior of various alkali cation-exchanged forms of merlinoite zeolites with Si/Al=2.3 and 3.8 at 25-75 degrees C and 0-1.0 bar is studied. It is found that different forms of extraframework cations in MER zeolites exhibit different CO2 adsorption characteristics, indicating a cooperative cation gating-breathing mechanism.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Chemistry, Physical

The role of mixed alkali metal cations on the formation of nanosized CHA zeolite from colloidal precursor suspension

Sajjad Ghojavand et al.

Summary: The synthesis of nanosized chabazite zeolites was investigated using organic template-free colloidal suspensions by adjusting the aging time and hydrothermal treatment time. Different alkali metal cations (Na+, K+, Cs+) were found to play distinct roles in the formation of CHA nanocrystals in the colloidal suspensions, influencing the crystallization speed and particle size.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2021)

Article Chemistry, Physical

Complex H-bonded silanol network in zeolites revealed by IR and NMR spectroscopy combined with DFT calculations

Eddy Dib et al.

Summary: The study investigated the characteristics of silanol sites in pure silica MFI-type zeolites and their impact on zeolite properties, identifying four types of silanols and indicating that the main factor determining the strength of the hydrogen bond of a specific silanol group is the possibility of its proton to approach closer to the oxygen center of the proton accepting silanol.

JOURNAL OF MATERIALS CHEMISTRY A (2021)

Article Nanoscience & Nanotechnology

Room-Temperature Synthesis of BPH Zeolite Nanosheets Free of Organic Template with Enhanced Stability for Gas Separations

Edwin B. Clatworthy et al.

Summary: BPH-type synthetic aluminosilicate zeolite (Linde Q) nanosheets were successfully synthesized at room temperature without organic structure-directing agents, showing high stability and CO2 adsorption capacity, making them suitable for gas separation applications.

ACS APPLIED NANO MATERIALS (2021)

Article Chemistry, Multidisciplinary

Synthesis of Discrete CHA Zeolite Nanocrystals without Organic Templates for Selective CO2Capture

Maxime Debost et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2020)

Article Chemistry, Physical

Nature of Chemisorbed CO2 in Zeolite A

Przemyslaw Rzepka et al.

JOURNAL OF PHYSICAL CHEMISTRY C (2019)

Review Chemistry, Multidisciplinary

Ionic liquid-based materials: a platform to design engineered CO2 separation membranes

Liliana C. Tome et al.

CHEMICAL SOCIETY REVIEWS (2016)

Review Chemistry, Multidisciplinary

Nanosized zeolites: Quo Vadis?

Svetlana Mintova et al.

COMPTES RENDUS CHIMIE (2016)

Article Chemistry, Physical

A DFT investigation of the adsorption of iodine compounds and water in H-, Na-, Ag-, and Cu- mordenite

Siwar Chibani et al.

JOURNAL OF CHEMICAL PHYSICS (2016)

Review Chemistry, Physical

Surface chemistry of carbon dioxide revisited

William Taifan et al.

SURFACE SCIENCE REPORTS (2016)

Review Multidisciplinary Sciences

Function-led design of new porous materials

Anna G. Slater et al.

SCIENCE (2015)

Article Chemistry, Physical

Factors Controlling the Acidity of Zeolites

Mercedes Boronat et al.

CATALYSIS LETTERS (2015)

Article Chemistry, Physical

Improved Density Dependent Correction for the Description of London Dispersion Forces

Tomas Bucko et al.

JOURNAL OF CHEMICAL THEORY AND COMPUTATION (2013)

Article Chemistry, Physical

Determination of Composition Range for Molecular Trapdoor Effect in Chabazite Zeolite

Jin Shang et al.

JOURNAL OF PHYSICAL CHEMISTRY C (2013)

Article Chemistry, Multidisciplinary

Probing the Relationship between Silicalite-1 Defects and Polyol Adsorption Properties

Elizabeth E. Mallon et al.

LANGMUIR (2013)

Article Chemistry, Multidisciplinary

Advances in nanosized zeolites

Svetlana Mintova et al.

NANOSCALE (2013)

Article Materials Science, Multidisciplinary

Tkatchenko-Scheffler van der Waals correction method with and without self-consistent screening applied to solids

Tomas Bucko et al.

PHYSICAL REVIEW B (2013)

Review Chemistry, Multidisciplinary

Review of recent advances in carbon dioxide separation and capture

Saeed Danaei Kenarsari et al.

RSC ADVANCES (2013)

Article Chemistry, Multidisciplinary

Zeolite Rho: a highly selective adsorbent for CO2/CH4 separation induced by a structural phase modification

Miguel Palomino et al.

CHEMICAL COMMUNICATIONS (2012)

Review Chemistry, Multidisciplinary

Carbon Dioxide Capture in Metal-Organic Frameworks

Kenji Sumida et al.

CHEMICAL REVIEWS (2012)

Article Chemistry, Multidisciplinary

Discriminative Separation of Gases by a Molecular Trapdoor Mechanism in Chabazite Zeolites

Jin Shang et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2012)

Article Materials Science, Ceramics

Preparation of silica xerogel with high silanol content from sodium silicate and its application as CO2 adsorbent

Thongthai Witoon et al.

CERAMICS INTERNATIONAL (2011)

Article Chemistry, Analytical

On the mechanism of adsorption and separation of CO2 on LTA zeolites:: An IR investigation

Tania Montanari et al.

VIBRATIONAL SPECTROSCOPY (2008)

Article Materials Science, Multidisciplinary

Calculation of NMR chemical shifts for extended systems using ultrasoft pseudopotentials

Jonathan R. Yates et al.

PHYSICAL REVIEW B (2007)

Review Chemistry, Physical

Nanozeolites: Synthesis, crystallization mechanism, and applications

L Tosheva et al.

CHEMISTRY OF MATERIALS (2005)

Article Chemistry, Multidisciplinary

Modelling one- and two-dimensional solid-state NMR spectra

D Massiot et al.

MAGNETIC RESONANCE IN CHEMISTRY (2002)