CO<sub>2</sub> Dynamic Adsorption/Desorption on Zeolite 5A Studied by <sup>13</sup>C Magnetic Resonance Imaging

Cheng, Yuesheng; Huang, Qinglin; Eić, Mladen; Balcom, Bruce J.

doi:10.1021/la047302p

Cited by 34 publications

(40 citation statements)

References 23 publications

(25 reference statements)

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“…Several technologies to separate and capture the industrial emissions of CO 2 have been developed. Among them, certain technologies are based on the CO 2 adsorption/desorption by using natural and synthetic zeolites [3,4]. The zeolites are a subclass of tectosilicates that possess a framework formed by a threedimensional assemblage of tetrahedra [SiO 4 ] and [(AlO 4 )-].…”

Section: Introductionmentioning

confidence: 99%

Advances in principal factors influencing carbon dioxide adsorption on zeolites

Bonenfant

Kharoune

Niquette

et al. 2008

Science and Technology of Advanced Materials

273

179

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We report the advances in the principal structural and experimental factors that might influence the carbon dioxide (CO 2 ) adsorption on natural and synthetic zeolites. The CO 2 adsorption is principally govern by the inclusion of exchangeable cations (countercations) within the cavities of zeolites, which induce basicity and an electric field, two key parameters for CO 2 adsorption. More specifically, these two parameters vary with diverse factors including the nature, distribution and number of exchangeable cations. The structure of framework also determines CO 2 adsorption on zeolites by influencing the basicity and electric field in their cavities. In fact, the basicity and electric field usually vary inversely with the Si/Al ratio. Furthermore, the CO 2 adsorption might be limited by the size of pores within zeolites and by the carbonates formation during the CO 2 chemisorption. The polarity of molecules adsorbed on zeolites represents a very important factor that influences their interaction with the electric field. The adsorbates that have the most great quadrupole moment such as the CO 2 , might interact strongly with the electric field of zeolites and this favors their adsorption. The pressure, temperature and presence of water seem to be the most important experimental conditions that influence the adsorption of CO 2 . The CO 2 adsorption increases with the gas phase pressure and decreases with the rise of temperature. The presence of water significantly decreases adsorption capacity of cationic zeolites by decreasing strength and heterogeneity of the electric field and by favoring the formation of bicarbonates. The optimization of the zeolites structural characteristics and the experimental conditions might enhance substantially their CO 2 adsorption capacity and thereby might give rise to the excellent adsorbents that may be used to capturing the industrial emissions of CO 2 .

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Section: Introductionmentioning

confidence: 99%

Advances in principal factors influencing carbon dioxide adsorption on zeolites

Bonenfant

Kharoune

Niquette

et al. 2008

Science and Technology of Advanced Materials

273

179

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“…Zeolites functionalized with molecular targeting vectors (e.g., peptides, aptamers) that enable specific high-affinity binding to in vivo molecular targets (such as cell surface receptors) were investigated. In addition, these materials possess unique properties that enable radionuclides and contrast agent metals to be concentrated for applications in magnetic resonance imaging (MRI) and positron emission tomography (PET) [63][64][65][66][67].…”

Section: Zeolite For Antimicrobial and Medical Applicationsmentioning

confidence: 99%

Progress in zeolite synthesis promotes advanced applications

Zaarour

Dong

Naydenova³

et al. 2014

Microporous and Mesoporous Materials

156

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a b s t r a c tThis article outlines the importance of zeolite synthesis and their unique physicochemical characteristics promoting advanced applications. The main strategies for preparation of zeolites including organic-template assisted, organic-template free and alternative procedures are considered for synthesis of crystallites offering control and fine-tuning of their properties. Besides, rational design of zeolites with pre-determined structure, porosity, size, morphology, and composition are more viable by studying carefully the chemical and physical parameters controlling the zeolite synthesis and understanding the crystallization mechanism. Finally, a particular attention to the preparation of zeolites with nanosized dimensions and their utilization in innovative applications including photovoltaic, medicine and holographic sensors are presented.

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“…Gladden et al (2002) demonstrated that by monitoring the 1 H chemical shift, spatial variation in liquid phase esterification of methanol and acetic acid in fixed bed reactors under flow conditions could be visualized. A limited number of studies have applied MRI to investigate reactive transport in porous media, including CO 2 adsoption/desorption on zeolites (Cheng et al, 2005), and metal ion sorption on glass beads (Moradi, 2008) and quartz sands (Nestle et al, 2003). Cheng et al (2005) applied 13 C MRI (2.35T magnet, 100 Gauss/cm) to investigate the adsorption / desorption kinetics of pure gas and condensed phase CO 2 on 8 – 12 mesh zeolite 5A beads, and a centric scan spin-echo single point imaging technique was employed to obtain transient 1D CO 2 density profiles with a 1 mm resolution.…”

Section: Imaging Applicationsmentioning

confidence: 99%