Abstract: In this study, the CO2 laser vaporization technique was used to synthesis 5 wt% Cr2O3-γ-Al2O3 nanocomposites with a controllable particle size of 4.8–14.8 nm, which served as catalysts for the catalytic dehydrogenation of isobutane. It was found that gas-phase laser synthesis leads to the formation of γ-Al2O3 spherical nanoparticles, with chromium predominantly stabilized as highly dispersed and catalytically active Cr2O3 clusters of a few nanometers in size on surfaces of γ-Al2O3 support. The formation of such composites occurs due to substantially differing vaporization temperatures of Al2O3 and Cr2O3. Additionally, the size of γ-Al2O3 nanoparticles and Cr2O3 clusters can be controlled by adjusting the pressure during vaporization and condensation. Cr2O3-γ-Al2O3 catalyst with average particle diameter of 4.8 nm exhibits the highest isobutene selectivity of 93.1 % among a series of samples. It was demonstrated that increasing the particle size from 4.8 to 14.8 nm leads to a decrease in conversion from 30.5 to 14.9 % and selectivity from 93.1 to 88.6 %. Laser-synthesized Cr2O3-γ-Al2O3 nanocomposite catalysts can be used as highly active and stable catalysts for dehydrogenation of alkanes with the decreased content of toxic Cr6+.

Cite: Kostyukov A.I. , Zaitseva N.A. , Nashivochnikov A.A. , Zhuzhgov A.V. , Kaichev V.V. , Kriventsov V.V. , Snytnikov V.N.
Dehydrogenation Activity of Cr6+ Free Laser-Synthesized Cr2O3–Al2O3 Nanocomposite Catalysts
Materials Today Chemistry. 2024. V.42. 102458 :1-10. DOI: 10.1016/j.mtchem.2024.102458 WOS Scopus AN OpenAlex publication_identifier_short.sciact_skif_identifier_type

Dates:

Submitted:	May 30, 2024
Accepted:	Dec 5, 2024
Published print:	Dec 7, 2024
Published online:	Dec 7, 2024

Identifiers:

Web of science:	WOS:001378068200001
Scopus:	2-s2.0-85211089248
Chemical Abstracts:	2024:2829288
OpenAlex:	W4405133096
publication_identifier.sciact_skif_identifier_type:	3631

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