Abstract
Methanol conversion to dimethyl ether using alumina-modified silica gel based adsorbents was studied. ASM, ASM VS, BASF KC-Trockenperlen H, BASF KC-Trockenperlen WS, and NIAP-AOS adsorbents used in industrial adsorption installations for natural gas treatment were tested. The composition and structural characteristics of the commercial adsorbents were characterized by X-ray fluorescence and X-ray diffraction analysis and by low-temperature nitrogen adsorption and were correlated with the catalytic activity. The dependences of the concentration of the dimethyl ether formed on the reaction temperature and carrier gas flow rate through the adsorbents were determined. Methanal, diethyl ether, acetone, methyl acetate, and ethanol were identified as by-products of methanol conversion on the tested adsorbents. The results of thermocatalytic transformations of methanol on the adsorbents demonstrated good prospects for using ASM silica gel modified with 4.6% aluminum oxide for natural gas treatment in industry; its use allows reduction of the methanol emission to the atmosphere. At 290°С and flow rate of nitrogen containing 197 ± 3 mg L–1 methanol of 1200 mL min–1, the methanol conversion on ASM 1 adsorbent reached 91 wt %, and the dimethyl ether yield reached 49 wt %.
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ACKNOWLEDGMENTS
Equipment of the Center for Shared Use Environmental-Analytical Center of the Kuban State University was used.
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The studies were performed within the framework of the government assignment of the Ministry of Science and Higher Education of the Russian Federation, project no. FZEN-2020-0022.
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Z.A. Temerdashev put forward the main ideas and participated in the manuscript writing; A.S. Kostina performed experimental studies, prepared review of publications on the subject of the paper, and participated in the data discussion and systematization and in the manuscript preparation; A.V. Rudenko and I.A. Kolychev participated in problem setting, in catalytic experiments, and in the data discussion and systematization; A.M. Vasil’ev studied the adsorbents by methods of thermal, X-ray fluorescence, and X-ray diffraction analysis.
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Translated from Zhurnal Prikladnoi Khimii, No. 5, pp. 570–579, January, 2021 https://doi.org/10.31857/S0044461821050042
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Temerdashev, Z.A., Kostina, A.S., Rudenko, A.V. et al. Catalytic Activity of Alumina-Modified Silica Gels in Methanol Conversion to Dimethyl Ether. Russ J Appl Chem 94, 576–585 (2021). https://doi.org/10.1134/S1070427221050049
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DOI: https://doi.org/10.1134/S1070427221050049