ADSORPTION OF CO<sub>2</sub>ON MICRO AND MESOPOROUS MOLECULAR SIEVES

Oliveira, Thiago G.; Machado, Sanny W. M.; Santos, Silvia C. G.; Souza, M. J. B.; Pedrosa, Anne Michelle Garrido

doi:10.5935/0100-4042.20140101

Cited by 5 publications

(4 citation statements)

References 30 publications

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“…The primary TO 4 units combine in various configurations to create distinct polyhedra and, consequently, diverse structures. Within the 1100-1000 cm -1 range, the band is attributed to internal asymmetric stretching vibrations of the T(Si-Al)-O bonds, while the band spanning 500 to 700 cm -1 is linked to the symmetric stretching of the external tetrahedra in the NaY zeolite T-O [42][43][44]. The bar at 1600 cm -1 is associated with the angular deformation of the hydroxyl group and the bands in the 2400-2500 cm -1 range result from the symmetric and asymmetric stretching of C-H. Additionally, the crew at 3400 cm -1 corresponds to the OH hydroxyl groups originating from water molecules in the zeolite cavities [45].…”

Section: Synthesis Of Nay Zeolitementioning

confidence: 98%

NaY Zeolite Synthesis from Vermiculite and Modification with Surfactant

Barros,

Barbosa,

Rodrigues

2023

Catal Res

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This work focuses on preparing NaY zeolite using alternative sources of silica and modifying the zeolite with the surfactant cetyltrimethylammonium bromide. Two different hydrothermal synthesis routes were employed: the conventional method using sodium silicate as the silica source, and the other is a sustainable approach using vermiculite clay as the silica source. In traditional zeolite synthesis, sodium silicate is often used as the source of silica. However, . The vermiculite was subjected to an acid treatment, followed by a primary treatment to obtain silica. Using the ion exchange method, the NaY zeolite was modified by an organic surfactant CTABr. Based on the various characterization techniques, it was possible to verify the obtaining of NaY zeolite through the conventional and sustainable routes, in which the structural properties were maintained. They used the sustainable path to synthesize NaY zeolite, which allowed for obtaining a material with low synthesis cost and properties similar to those synthesized conventionally. The structures of the NaY zeolites were maintained after the modification process with the surfactant Cetyltrimethylammonium Bromide (CTABr), demonstrating the structural stability of the zeolites and the efficiency of the modification process.

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Section: Synthesis Of Nay Zeolitementioning

confidence: 98%

NaY Zeolite Synthesis from Vermiculite and Modification with Surfactant

Barros,

Barbosa,

Rodrigues

2023

Catal Res

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“…The synthesized zeolites can be used for the adsorption of carbon dioxide (CO 2 ) to mitigate the environmental impacts caused by greenhouse gas emissions [20][21][22][23][24]. The wide application of zeolites for CO 2 adsorption is enabled due to larger pore cavities compared to the molecular diameter of carbon dioxide [25][26][27][28][29]. The aim of the present work is to compare and diagnose the additions of an external source of aluminium (ESA) for synthesis of zeolite from RHA.…”

Section: Introductionmentioning

confidence: 99%

Comparative study using different external sources of aluminum on the zeolites synthesis from rice husk ash

Klunk

Das

Dasgupta

et al. 2020

Mater. Res. Express

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Rice husk is considered as a waste in the rice industry but is proficient in manufacturing different materials, such as zeolites, which is produced in large quantities all over the world, for example in Brazil. Zeolite is an adsorbent support material, which can be synthesized from rice husk ash (RHA) with external sources of aluminium (ESA). The scientific community has been conducting several measures to minimize the environmental impacts caused by greenhouse gases. Several mitigation processes are presently investigated, which includes carbon dioxide injections into adsorbent materials (e.g. zeolites). The efficiency of this technology involves a zeolitic material with high crystallinity and high concentrations of SiO 2 and Al 2 O 3 (aluminosilicates). In the present work, zeolites have been synthesized from rice husk ash (SiO 2 source) and external aluminium sources (Al 2 O 3 -alumina, gibbsite and metakaolin) to fulfill that purpose. With the aid of XRF, XRD, SEM/ EDS and FTIR techniques, the zeolitic material was characterized in two distinct crystalline phases: Mordenite and ZSM-5. The synthesis was carried out by the ideal addition of ESA (2.5 g) to RHA. According to the literature, the zeolitic materials formed by the mixture of Mordenite and ZSM-5 can be availed for gas separation and greenhouse gas storage.

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“…After that study, a wide variety of solids, especially mesoporous silicas, were used for the capture and separation of CO 2 [12][13][14][15][16][17] and synthesized by the hydrothermal method [18,19]. For adsorption tests, the gravimetric method has been widely used in the literature and consists of measuring the adsorbent mass as the adsorption phenomenon occurs [20][21][22][23][24].Therefore, this research has aimed to synthesize a CO 2 adsorbent material from bimodal silica via the hydrothermal method to obtain an adsorbent silica with an ordered structure of the meso-macroporous type. After synthesis, this material was characterized to present the textural properties of the bimodal silica.…”

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confidence: 99%

The Efficiency of Bimodal Silica as a Carbon Dioxide Adsorbent for Natural Gas Treatment

et al. 2020

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Natural gas (NG) production in Brazil has shown a significant increase in recent years. Oil and natural gas exploration and refining activities indicate circa 86% carbon dioxide content in NG, representing a serious problem for environmental issues related to greenhouse gas emissions and increases in global warming. New technologies using CO2 capture materials have been shown to be more efficient than conventional processes. In this work, a bimodal meso–macroporous silica adsorbent for CO2 adsorption in NG was synthesized and evaluated as a promising material for use in natural gas treatment systems, as silica has specific textural properties that facilitate the capture and storage of this gas. The adsorbent was obtained from silica via the hydrothermal method with n-dodecane emulsion and characterized by X-ray diffraction, scanning electron microscopy, infrared spectroscopy, and the BET specific surface area. Adsorption capacity tests were performed for CO2, methane, and their mixtures by the gravimetric method, demonstrating that the adsorbent was selective for CO2 and obtained a good adsorption capacity. The experimental values obtained were compared and adjusted to the models of Langmuir and Freundlich. Thus, the bimodal silica adsorbent developed in this research proved to be excellent for CO2 adsorption and is a promising material for the treatment of NG.

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ADSORPTION OF CO₂ON MICRO AND MESOPOROUS MOLECULAR SIEVES

Cited by 5 publications

References 30 publications

NaY Zeolite Synthesis from Vermiculite and Modification with Surfactant

NaY Zeolite Synthesis from Vermiculite and Modification with Surfactant

Comparative study using different external sources of aluminum on the zeolites synthesis from rice husk ash

The Efficiency of Bimodal Silica as a Carbon Dioxide Adsorbent for Natural Gas Treatment

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ADSORPTION OF CO2ON MICRO AND MESOPOROUS MOLECULAR SIEVES

Cited by 5 publications

References 30 publications

NaY Zeolite Synthesis from Vermiculite and Modification with Surfactant

NaY Zeolite Synthesis from Vermiculite and Modification with Surfactant

Comparative study using different external sources of aluminum on the zeolites synthesis from rice husk ash

The Efficiency of Bimodal Silica as a Carbon Dioxide Adsorbent for Natural Gas Treatment

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ADSORPTION OF CO₂ON MICRO AND MESOPOROUS MOLECULAR SIEVES