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

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Postgraduate Program in Petroleum Science and Engineering, Federal University of Rio Grande do Norte, Natal 59078-970, RN, Brazil
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SENAI Institute of Innovation in Renewable Energy, Sustainability Laboratory, Natal 59064-164, RN, Brazil
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Postgraduate Program in Chemical Engineering, Federal University of Rio Grande do Norte, Natal 59078-970, RN, Brazil
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Author to whom correspondence should be addressed.
Processes 2020, 8(3), 289; https://doi.org/10.3390/pr8030289
Received: 17 January 2020 / Revised: 12 February 2020 / Accepted: 18 February 2020 / Published: 4 March 2020
(This article belongs to the Special Issue Integration of Carbon Dioxide and Hydrogen Supply Chains)
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. View Full-Text
Keywords: carbon dioxide adsorption; methane; natural gas; silica; hybrid materials carbon dioxide adsorption; methane; natural gas; silica; hybrid materials
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MDPI and ACS Style

Correia de Carvalho, F.; do Nascimento, P.F.; Oliveira de Souza, M.R.; Souza Araujo, A. The Efficiency of Bimodal Silica as a Carbon Dioxide Adsorbent for Natural Gas Treatment. Processes 2020, 8, 289.

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