Synthesis of dimethyl carbonate from CO2 and methanol over CeO2: Role of copper as dopant and the use of methyl trichloroacetate as dehydrating agent
| Autor: | Claudio J. A. Mota, Aryane A. Marciniak, Lucia G. Appel, Odivaldo C. Alves |
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| Rok vydání: | 2019 |
| Předmět: |
010405 organic chemistry
Methyl formate chemistry.chemical_element 010402 general chemistry 01 natural sciences Copper Catalysis 0104 chemical sciences chemistry.chemical_compound chemistry Dehydrogenation Reactivity (chemistry) Dimethoxymethane Methanol Physical and Theoretical Chemistry Dimethyl carbonate Nuclear chemistry |
| Zdroj: | Journal of Catalysis. 371:88-95 |
| ISSN: | 0021-9517 |
| DOI: | 10.1016/j.jcat.2019.01.035 |
| Popis: | The effect of copper as dopant on ceria (CeO 2) was investigated in the direct synthesis of dimethyl carbonate (DMC) from CO2 and methanol. Ceria with different copper loadings (0.02 and 0.5 wt%) was synthesized using the dry impregnation method and characterized by H2-TPR, XRD, EPR, UV–VIS/DRS, acid-base properties and N2 physisorption . CeO 2 with 0.02 wt% of Cu showed the highest catalytic activity and selectivity to DMC, mostly due to its basic sites, associated with the presence of oxygen vacancies. Higher Cu concentration (0.5 wt%) promotes dehydrogenation , favoring the formation of methyl formate as the main product. Pure CeO 2 also produced dimethoxymethane as by-product. To circumvent the thermodynamic limitations of the reaction, methyl trichloroacetate was tested as dehydrating agent, showing superior performance than 2-cyanopyridine, due to its higher reactivity toward hydrolysis. |
| Databáze: | OpenAIRE |
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