Effect of Lithium Nitrate Doping on the Phase Composition of Alumina–Chromium Catalysts Научная публикация
| Журнал |
Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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| Вых. Данные | Год: 2020, Том: 61, Номер: 3, Страницы: 473-479 Страниц : 7 DOI: 10.1134/s0023158420030076 | ||||
| Ключевые слова | alumina–chromium catalyst; differential dissolution method; modifying additives; stoichiograms | ||||
| Авторы |
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| Организации |
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Информация о финансировании (1)
| 1 | Федеральное агентство научных организаций России | 0303-2016-0003 |
Реферат:
The effect of a lithium nitrate (LiNO3) modifying additive on the genesis of the phase composition of alumina–chromium catalysts has been studied using the differential dissolution (DD) and X-ray diffraction (XRD) methods. It has been shown that LiNO3 reacts with a pure support (Al2O3) to form lithium aluminate, double oxide Al4Li2O7 with a spinel structure, and mixed hydroxide LiAl2(OH)7(H2O)2. The reaction of an alumina–chromium catalyst with LiNO3 also leads to the formation of lithium aluminate and double oxide Al4Li2O7; however, a mixed hydroxide is not formed. In addition, the reaction of lithium cations with the Cr(VI) catalyst active component leads to the formation of lithium chromate. A comparative analysis of the phase compositions of alumina–chromium catalysts with LiCl and LiNO3 additives has been conducted. It has been found that, depending on the nature of the additive, the phase composition of the catalyst partially changes. In the case of the introduction of lithium chloride, solid solutions of Cr(III) and Li(I) in alumina are formed; the use of lithium nitrate leads to the formation of double oxide Al4Li2O7 and lithium aluminate. The results of studying the activity of 0.5–3% Li + 9.5% Cr + Al2O3 catalyst samples (Li being introduced from LiCl and LiNO3) have shown that the replacement of the LiCl modifying additive by LiNO3 leads to a change in the catalytic properties of the alumina–chromium catalysts. The activity of the sample doped with lithium nitrate is 4–8% higher than the activity of the sample doped with lithium chloride. This finding can be attributed to the fact that, in the case of the LiNO3 additive, the concentration of the formed active phases Li2CrO4 and Cr2O3 is higher. The selectivities of the catalysts modified with lithium salts (chloride and nitrate) differ only slightly owing to the formation of identical active phases.
Библиографическая ссылка:
Boldyreva N.N.
, Chesnokov V.V.
, Dovlitova L.S.
, Chichkan A.S.
Effect of Lithium Nitrate Doping on the Phase Composition of Alumina–Chromium Catalysts
Kinetics and Catalysis. 2020. V.61. N3. P.473-479. DOI: 10.1134/s0023158420030076 WOS Scopus РИНЦ CAPlus OpenAlex
Effect of Lithium Nitrate Doping on the Phase Composition of Alumina–Chromium Catalysts
Kinetics and Catalysis. 2020. V.61. N3. P.473-479. DOI: 10.1134/s0023158420030076 WOS Scopus РИНЦ CAPlus OpenAlex
Оригинальная:
Болдырева Н.Н.
, Чесноков В.В.
, Довлитова Л.С.
, Чичкань А.С.
Влияние допирования нитратом лития на фазовый состав алюмохромовых катализаторов
Кинетика и катализ. 2020. Т.61. №3. С.436-442. DOI: 10.31857/s0453881120030089RSCI РИНЦ OpenAlex
Влияние допирования нитратом лития на фазовый состав алюмохромовых катализаторов
Кинетика и катализ. 2020. Т.61. №3. С.436-442. DOI: 10.31857/s0453881120030089RSCI РИНЦ OpenAlex
Даты:
| Поступила в редакцию: | 28 июн. 2019 г. |
| Принята к публикации: | 20 дек. 2019 г. |
| Опубликована в печати: | 1 мая 2020 г. |
| Опубликована online: | 29 июн. 2020 г. |
Идентификаторы БД:
| Web of science: | WOS:000544023000014 |
| Scopus: | 2-s2.0-85087007808 |
| РИНЦ: | 43299343 |
| Chemical Abstracts: | 2020:1274456 |
| OpenAlex: | W3037523452 |