The Effect of Substituting La and Co with Ca and Ti in LaCoO3/KIT-6 on Its Properties and Possible Catalytic Application in Syngas Conversion Full article
| Journal |
Materials Chemistry and Physics
ISSN: 0254-0584 , E-ISSN: 1879-3312 |
||
|---|---|---|---|
| Output data | Year: 2022, Volume: 276, Article number : 125387, Pages count : 9 DOI: 10.1016/j.matchemphys.2021.125387 | ||
| Tags | cobalt-titanium perovskites; KIT-6 support synthesis; syngas conversion. | ||
| Authors |
|
||
| Affiliations |
|
Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 0239-2021-0010 |
Abstract:
Perovskite-type samples La1-xCaxCo1-xTixO3/KIT-6 (x = 0 0.5) were synthesized by citrate method. KIT-6 is partially embedded in the perovskite structure. The complete reduction of cobalt in perovskites in the presence of KIT-6 occurs at a temperature of ca. 670°C due to the formation of a cobalt silicate phase. With the substitution of titanium for cobalt cations, the complete reduction of cobalt occurs at temperatures above 720°C. The proportion of cobalt that is reduced at temperatures below 500°C increases with an increase in the ratio of Co3+/Co2+ cations. Partial substitution of cobalt cations with titanium cations decreases the selectivity ratios SCH3OH/SC2+OH and SCH4/SC2-8. The introduction of calcium cations leads, proportionally to its content, to a strong decrease in selectivity to methanol and an increase in selectivity for light hydrocarbons C2-8 in syngas conversion. It was shown that the maximum selectivity for higher alcohols with a low selectivity for methanol is observed at x = 0.3 on a sample containing calcium. A significant amount of the cobalt carbide phase Co2C in the used KIT-6-free sample of LaCoO3 is accompanied by the predominance of the methanation reaction (CH4 selectivity 58.7%). The synthesized samples on KIT-6 have higher selectivity to alcohols compared to a conventional CoAl oxide catalyst and somewhat lower activity in syngas conversion.
Cite:
Dokuchits E.V.
, Larina T.V.
, Ishchenko A.V.
, Minyukova T.P.
The Effect of Substituting La and Co with Ca and Ti in LaCoO3/KIT-6 on Its Properties and Possible Catalytic Application in Syngas Conversion
Materials Chemistry and Physics. 2022. V.276. 125387 :1-9. DOI: 10.1016/j.matchemphys.2021.125387 WOS Scopus РИНЦ AN OpenAlex
The Effect of Substituting La and Co with Ca and Ti in LaCoO3/KIT-6 on Its Properties and Possible Catalytic Application in Syngas Conversion
Materials Chemistry and Physics. 2022. V.276. 125387 :1-9. DOI: 10.1016/j.matchemphys.2021.125387 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Jul 8, 2021 |
| Accepted: | Oct 26, 2021 |
| Published online: | Oct 29, 2021 |
| Published print: | Jan 15, 2022 |
Identifiers:
| Web of science: | WOS:000715750700005 |
| Scopus: | 2-s2.0-85118330858 |
| Elibrary: | 47521484 |
| Chemical Abstracts: | 2021:2404422 |
| OpenAlex: | W3210206298 |