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Sodium Promoted FeZn@SiO 2 -C Catalysts for Sustainable Production of Low Olefins by CO 2 Hydrogenation.
- Source :
- Catalysts (2073-4344); Dec2023, Vol. 13 Issue 12, p1508, 14p
- Publication Year :
- 2023
-
Abstract
- A prepared FeZnNa@SiO<subscript>2</subscript>-C catalyst with graphitized carbon (C)-modified mesoporous SiO<subscript>2</subscript> supports metal nanoparticles with the sol–gel method. The effect of adding metal Na and Zn promoters as a dispersion on the CO<subscript>2</subscript> hydrogenation to low olefins was systematically studied. The results showed that Zn–Na, as a combination, could promote the absorption of CO<subscript>2</subscript> and improved the conversion rate of CO<subscript>2</subscript>. Na as an alkaline substance can improve the absorption of more acidic CO<subscript>2</subscript>, which could increase the conversion rate of CO<subscript>2</subscript> to 59.03%. Meanwhile, the addition of secondary metal Zn to Fe-based catalysts to form a surface alloy could alter the adsorption of CO<subscript>2</subscript> and the activation of C-O bonds, inhibit the subsequent hydrogenation of olefins to paraffins, and facilitate the reduction of Fe<subscript>2</subscript>O<subscript>3</subscript> and the formation of active Fe<subscript>5</subscript>C<subscript>2</subscript> species. The formation of active Fe<subscript>5</subscript>C<subscript>2</subscript> species was found in TEM and XRD, and the selectivity of the target product was 41.07%. The deep hydrogenation of olefins was inhibited, and the space–time yield (STY) of low olefins was raised again by inhibiting their deep hydrogenations, up to 0.0436. However, the corresponding STY did not increase infinitely with the increase of Na doping, and higher catalytic performance for CO<subscript>2</subscript> hydrogenation could be exhibited when the Na doping reached 6.4%. Compared with Fe@SiO<subscript>2</subscript>-C catalyst, Na- and Zn-promoted Fe-based catalysts, prepared by the modified sol-gel method, can be used directly for highly efficient CO<subscript>2</subscript> hydrogenation to low olefins and thus has a more promising application prospect in the future. [ABSTRACT FROM AUTHOR]
- Subjects :
- SUSTAINABILITY
COBALT catalysts
HYDROGENATION
CARBON dioxide
ALKENES
SCRAP metals
Subjects
Details
- Language :
- English
- ISSN :
- 20734344
- Volume :
- 13
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Catalysts (2073-4344)
- Publication Type :
- Academic Journal
- Accession number :
- 174401984
- Full Text :
- https://doi.org/10.3390/catal13121508