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Title: | Synthesis of Dimethyl Carbonate by Transesterification of Propylene Carbonate with Methanol on CeO2-La2O3 Oxides Prepared by the Soft Template Method | Authors: | Cutrufello, Maria Giorgia Atzori, Luciano Meloni, Daniela PIRAS, Alessandra Gazzoli, Delia Rombi, Elisabetta |
Issue Date: | 2021 | Publisher: | MDPI | Source: | MATERIALS, 14 (17) , (Art N° 4802) | Abstract: | In this study, CeO2, La2O3, and CeO2-La2O3 mixed oxide catalysts with different Ce/La molar ratios were prepared by the soft template method and characterized by different techniques, including inductively coupled plasma atomic emission spectrometry, X-ray diffraction, N-2 physisorption, thermogravimetric analysis, and Raman and Fourier transform infrared spectroscopies. NH3 and CO2 adsorption microcalorimetry was also used for assessing the acid and base surface properties, respectively. The behavior of the oxides as catalysts for the dimethyl carbonate synthesis by the transesterification of propylene carbonate with methanol, at 160 degrees C under autogenic pressure, was studied in a stainless-steel batch reactor. The activity of the catalysts was found to increase with an increase in the basic sites density. The formation of dimethyl carbonate was favored on medium-strength and weak basic sites, while it underwent decomposition on the strong ones. Several parasitic reactions occurred during the transformation of propylene carbonate, depending on the basic and acidic features of the catalysts. A reaction pathway has been proposed on the basis of the components identified in the reaction mixture. | Notes: | Rombi, E (corresponding author), Univ Cagliari, Dipartimento Sci Chim & Geol, Complesso Univ Monserrato, I-09042 Monserrato, Italy.; Rombi, E (corresponding author), Consorzio Interuniv Nazl Sci & Tecnol Mat INSTM, Unita Cagliari, I-50121 Florence, Italy. gcutrufe@unica.it; lucianoatzori@hotmail.it; dmeloni@unica.it; arla_piras@msn.com; delia.gazzoli@uniroma1.it; rombi@unica.it |
Keywords: | CeO2-La2O3 oxides;soft template method;dimethyl carbonate;propylene carbonate transesterification;adsorption microcalorimetry | Document URI: | http://hdl.handle.net/1942/36145 | ISSN: | 1996-1944 | e-ISSN: | 1996-1944 | DOI: | 10.3390/ma14174802 | ISI #: | WOS:000694262100001 | Rights: | 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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materials-14-04802-v2.pdf | Published version | 2.32 MB | Adobe PDF | View/Open |
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