Isobutane Dehydrogenation on CrOx/Al2O3 Nanoparticles Prepared by Laser Synthesis in Various Gases | Sciact - CRIS-система Института катализа

Isobutane Dehydrogenation on CrOx/Al2O3 Nanoparticles Prepared by Laser Synthesis in Various Gases Научная публикация

Журнал

Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210

Вых. Данные

Год: 2023, Том: 64, Номер: 5, Страницы: 645–654 Страниц : 10 DOI: 10.1134/S0023158423050014

Ключевые слова

CrOx/Al2O3; nanoparticles; Cr2O3 nanoclusters; dehydrogenation; isobutene; isobutylene; active sites; laser evaporation; gas phase; hydrogen; CO2 laser

Авторы

Baronskiy M.G. ¹ , Zaitseva N.A. ¹ , Kostyukov A.I. ¹ , Zhuzhgov A.V. ¹ , Snytnikov V.N. ¹

Организации

1	Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

Информация о финансировании (1)

Российский научный фонд

21-19-00429

The catalytic properties of nCrOx/Al2O3 nanoparticles (n = 4.8 ± 0.05 wt %), which were obtained by laser synthesis in various gases and tested in the isobutane dehydrogenation reaction, were studied in detail for the first time. The laser synthesis of 4.8% CrOx/Al2O3 nanopowders was carried out by the evaporation of 5.0% Cr : α-Al2O3 ceramic targets using cw CO2 laser irradiation in inert, oxidizing, and reducing gas atmospheres in a evaporation chamber (in an atmosphere of Ar and in Ar with the addition of O2, H2, and CH4 at concentrations of 20, 30, and 13 vol %, respectively). The effect of the gas atmosphere in the synthesis of 4.8% CrOx/Al2O3 nanopowders on their catalytic properties (activity, selectivity, conversion, and stability in the reaction) was determined. A comprehensive study of the physicochemical properties of the prepared nanoscale catalysts was carried out using XRD analysis, HRTEM, UV–Vis DRS, and Raman spectroscopy. According to XRD analysis data, the phase composition predominantly consisted of γ-Al2O3 with the beginning of the transition to δ-Al2O3. According to the HRTEM results, the shape of the nanoparticles was spherically symmetric with an average particle size dm = 15 nm. The charge states of Crq+ (q = 3, 6) in different coordination (Cr6+(Td) and Cr3+(Oh)) and in different ratios depending on the gas atmosphere used in the process of laser evaporation were revealed in the obtained 4.8% CrOx/Al2O3 nanopowders using the UV–Vis DRS technique. The nanosized 4.8% CrOx/Al2O3 catalyst obtained in an atmosphere of (Ar + H2) demonstrated the highest values of isobutane conversion (39%) and selectivity for isobutylene (90.7%); the lowest values of conversion (18.8%) and selectivity (85.6%) were typical of the sample prepared in an atmosphere of (Ar + CH4). Thus, the 4.8% CrOx/Al2O3 nanocatalyst synthesized in an atmosphere of (Ar + H2) was the most active and selective in the isobutane dehydrogenation reaction, and the presence of methane during evaporation led to the initial surface carbonization.

Baronskiy M.G. , Zaitseva N.A. , Kostyukov A.I. , Zhuzhgov A.V. , Snytnikov V.N.
Isobutane Dehydrogenation on CrOx/Al2O3 Nanoparticles Prepared by Laser Synthesis in Various Gases
Kinetics and Catalysis. 2023. V.64. N5. P.645–654. DOI: 10.1134/S0023158423050014 WOS Scopus РИНЦ CAPlus OpenAlex

Баронский М.Г. , Зайцева Н.А. , Костюков А.И. , Жужгов А.В. , Снытников В.Н.
Дегидрирование изобутана на наночастицах СrOx/Al2O3, полученных лазерным синтезом в различных газах
Кинетика и катализ. 2023. Т.64. №5. С.620-630. DOI: 10.31857/S0453881123050015 РИНЦ OpenAlex

Поступила в редакцию:	30 окт. 2022 г.
Принята к публикации:	18 апр. 2023 г.
Опубликована в печати:	5 окт. 2023 г.
Опубликована online:	5 окт. 2023 г.

Web of science:	WOS:001081712800009
Scopus:	2-s2.0-85173748299
РИНЦ:	55169566
Chemical Abstracts:	2023:2077515
OpenAlex:	W4387360369

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