Hydrogenation of CO2 over 15% Fe/SiO2 Catalyst under Sub- and Supercritical Conditions
| Autor: | Nikolai A. Davshan, Alexander L. Kustov, G. I. Kapustin, Konstantin O. Kim, Nikolay D. Evdokimenko |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Kataliz v promyshlennosti. 18:57-63 |
| ISSN: | 2413-6476 1816-0387 |
| DOI: | 10.18412/1816-0387-2018-4-57-63 |
| Popis: | The results of comparative studies of CO2hydrogenation over 15% Fe/SiO2catalyst under sub- and supercritical conditions are presented for the first time. The reaction was studied at 300–500 °C and atmospheric pressure in gas phase and at 95 atm under supercritical conditions. The molar H2: CO2ratio was 2 : 1. Under supercritical conditions, the selectivity to CO2decreased from 90–95 to 30–50 % at all temperatures, while the selectivity to hydrocarbons increased up to 60 %. The reaction under supercritical conditions, unlike gas-phase hydrogenation, produced alcohols. TG-DTG-DTA techniques were used to demonstrate 2.2-fold decrease in the quantity of carbon-like deposits in comparison to that in the gas-phase reaction. XRD studies revealed the formation of graphite-like species on the catalyst surface under gas-phase but not supercritical conditions. The developed process and catalyst for hydrogenation of CO2can be recommended to be further modified in order to improve the catalyst based on iron nanoparticles that is as expensive as 0.1–0.01 of the known catalysts for CO2hydrogenation. |
| Databáze: | OpenAIRE |
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