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 Научная публикация
| Журнал |
Materials Chemistry and Physics
ISSN: 0254-0584 , E-ISSN: 1879-3312 |
||
|---|---|---|---|
| Вых. Данные | Год: 2022, Том: 276, Номер статьи : 125387, Страниц : 9 DOI: 10.1016/j.matchemphys.2021.125387 | ||
| Ключевые слова | cobalt-titanium perovskites; KIT-6 support synthesis; syngas conversion. | ||
| Авторы |
|
||
| Организации |
|
Информация о финансировании (1)
| 1 | Министерство науки и высшего образования Российской Федерации (с 15 мая 2018) | 0239-2021-0010 |
Реферат:
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.
Библиографическая ссылка:
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 CAPlus 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 CAPlus OpenAlex
Даты:
| Поступила в редакцию: | 8 июл. 2021 г. |
| Принята к публикации: | 26 окт. 2021 г. |
| Опубликована online: | 29 окт. 2021 г. |
| Опубликована в печати: | 15 янв. 2022 г. |
Идентификаторы БД:
| Web of science: | WOS:000715750700005 |
| Scopus: | 2-s2.0-85118330858 |
| РИНЦ: | 47521484 |
| Chemical Abstracts: | 2021:2404422 |
| OpenAlex: | W3210206298 |