Preparation and modification of zeolite A from kaolin for catalytic methanation of carbon dioxide

In this research, in an attempt to make use of the kaolin resources in Vietnam, we present a synthetic process of zeolite A via hydrothermal from kaolinite, together with the modification process of zeolite A using different metallic cations. The characteristics of the prepared zeolite LTAs such as chemical composition and crystalline structure, as well as their catalytic activity in the methanation reaction of carbon dioxide (CO2) to methane (CH4) were extensively investigated.
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Preparation and modification of zeolite A from kaolin for catalytic methanation of carbon dioxideCite this paper: Vietnam J. Chem., 2023, 61(2), 170-177 Research articleDOI: 10.1002/vjch.202200027 Preparation and modification of zeolite A from kaolin for catalytic methanation of carbon dioxide Do Cao Son1,2, Vo Thi Kieu Anh4, Nguyen Thi Thom4, Huynh Le Thanh Nguyen2,3*, Le Viet Hai2,3,Co Thanh Thien2,3, Nguyen Thai Hoang2,3, Tran Dai Lam4, Pham Thi Nam4, Nguyen Thi Thu Trang1,4* 1 Graduate University of Sciences and Technology, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet road, Cau Giay district, 10000 Hanoi, Viet Nam 2 University of Science, 227 Nguyen Van Cu road, district 5, 70000 Ho Chi Minh City, Viet Nam3 Vietnam National University of Ho Chi Minh City, Vo Truong Toan road, Linh Trung district, Thu Duc City, 70000 Ho Chi Minh City, Viet Nam 4 Institute of Tropical Technology, Vietnam Academic of Science and Technology (VAST), 18 Hoang Quoc Viet road, Cau Giay district, 10000 Hanoi, Viet Nam Submitted February 28, 2022, Revised April 28, 2022, Accepted May 24, 2022Abstract Different types of zeolite including Zeolite A are prepared from natural kaolin originated in Vietnam. Raw kaolinwas collected from Phu Tho, Vietnam, underwent metakaolization at 650 °C within 2 hours and alkalination with NaOHto synthesize various zeolitic samples. Various characterization techniques were performed, including X- Ray Diffraction,Fourier-transform infrared spectroscopy, and Scanning Electron Microscopy. Different concentrations of NaOH wereutilized to study the difference of the prepared zeolite. Nickel-doped zeolite A samples with different nickel loading werealso prepared via ion exchange method and were employed as catalyst for the hydrogenation of carbon dioxide (CO2) toobtain methane (CH4). The best catalytic activity of 55.2 %CO2 conversion and 92.7 %CH4 selectivity was achieved with10 %Ni/ZM1 at 350 °C, 1 atm, H2:CO2 ratio of 4:1, and gas hourly space velocity of 9,000 mL.g-1.h-1. This studydemonstrates a promising pathway of modifying Vietnamese natural kaolin as a low-cost but an effective alternativematerial for the preparation of zeolite A and its application in the carbon dioxide methanation reaction. Keywords. Zeolite A, kaolin, carbon dioxide, methane, methanation.1. INTRODUCTION linked with the oxygen atoms, making up a porous framework and a highly ordered channel structure.[8]Situated in the central part of Southeast Asia and The cations present in the channels can be replacedbelonging to the Eurasian lithosphere plate, Vietnam by other cations via adsorption or ion exchange, thusis blessed with a rich diversity of mineral resources, the adsorption capability as well as the catalyticpossessing more than 5000 mineral deposits properties of zeolite.[9] As a result, zeolites have beenconsisting of more than 60 types of minerals.[1] attracting a lot of interest among researchers allRecently, many of them are being exploited, around the world. Zeolites are commonly prepared byincluding oil, natural gas, coal, kaolin, silica sand, hydrothermal reaction from various sources oflead, zinc, copper, gold, phosphate, fluorite, etc. as amorphous or soluble Si and Al, both academicallywell as mineral and thermal springs.[2] Especially, and industrially. Currently, different natural sources,kaolinite-rich minerals can be extracted from the soils namely kaolin, clay, fly ash, bauxite, feldspar, naturaloriginating from the minerals in the Red River Delta oxides and other silica sources,[10,11] were employedregion, the North Midland and the Mountainous to synthesize zeolites in order to benefit from theirregion of Vietnam.[3] highly porous structures, large specific surface area, Zeolites are materials with a broad range of high ionic exchange capacity, inexpensiveness andapplications, for example, catalysis,[4] ion-exchange easy availability.[12]membranes,[5] chemical separation,[6] and gas Kaolinite (Al2O3.2SiO2.2H2O) has largely beensorption.[7] They belong to aluminosilicate mineral utilized as an alternative source of aluminum andfamily in which the tetrahedral Si and Al atoms are silicon in zeolite synthesis due to its abundance in170 Wiley Online Library © 2023 Vietnam Academy of Science and Technology, Hanoi & Wiley-VCH GmbH 25728288, 2023, 2, Downloaded from https://onlinelibrary.wiley.com/doi/10.1002/vjch.202200027 by Readcube (Labtiva Inc.), Wiley Online Library on [02/05/2024]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons LicenseVietnam Journal of Chemistry Huynh Le Thanh Nguyen et al.nature and its ability to synthesize zeolite without employed as the reactant gases and carrier gas for themuch need of purification, including zeolites Linde catalytic testing.Type A, X and Y, as well as several other types ofzeolites.[13] Zeolite LTA was prepared by 2.2. Preparation of z ...