1. Laser vaporized CrOx/Al2O3 nanopowders as a catalyst for isobutane dehydrogenation.
- Author
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Kostyukov, Anton I., Baronskiy, Mark G., Larina, Tatyana V., Snytnikov, Vladimir N., Zaitseva, Nadezhda A., Pochtar, Alena A., Ishchenko, Arcady V., Cherepanova, Svetlana V., and Snytnikov, Valeriy N.
- Subjects
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CATALYTIC dehydrogenation , *CATALYSTS , *DEHYDROGENATION , *NANOPARTICLES , *LASERS , *CATALYTIC activity - Abstract
Laser vaporized xCr/Al 2 O 3 nanopowders with the particle size of ca. 15 nm were studied by XRF, EDX, HRTEM, XRD, DD, BET, TGA, UV–Vis DRS, Raman and PL spectroscopy methods as a catalytic system in dehydrogenation of isobutane. The nanopowders were found to contain not only the Cr6+ ions located on the surface of nanoparticles, but also two different types of Cr3+ sites as components of the γ-Al 2 O 3 solid solution. One type consists of the bulk Cr3+ b sites in a strong crystal field. Another type is represented by the Cr3+ s sites residing near the surface of xCr/Al 2 O 3 nanoparticles. Such sites are in a weak crystal field. It was shown that catalytic activity of the nanostructured xCr/Al 2 O 3 system is provided by the high content of surface Cr3+ s sites. The results obtained make it possible to propose the nanopowders obtained by laser synthesis as a promising catalytic system that can be used in the development of highly active catalysts for dehydrogenation of alkanes with the decreased chromium content. Unlabelled Image • Model CrO x /Al 2 O 3 nanoparticle catalysts were obtained by laser vaporization • Structure, morphology and optical properties of CrO x /Al 2 O 3 nanopowders were studied • Cr3+ s sites are located near the surface of CrO x /Al 2 O 3 nanoparticles • Cr3+ s sites play the key role in the isobutane dehydrogenation reaction • CrO x /Al 2 O 3 nanoparticles are highly active catalysts with the decreased Cr content [ABSTRACT FROM AUTHOR]
- Published
- 2020
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