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Laser vaporized CrOx/Al2O3 nanopowders as a catalyst for isobutane dehydrogenation
Materials Characterization ( IF 4.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.matchar.2020.110664
Anton I. Kostyukov , Mark G. Baronskiy , Tatyana V. Larina , Vladimir N. Snytnikov , Nadezhda A. Zaitseva , Alena A. Pochtar , Arcady V. Ishchenko , Svetlana V. Cherepanova , Valeriy N. Snytnikov

Abstract Laser vaporized xCr/Al2O3 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-Al2O3 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/Al2O3 nanoparticles. Such sites are in a weak crystal field. It was shown that catalytic activity of the nanostructured xCr/Al2O3 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.

中文翻译:

激光汽化 CrOx/Al2O3 纳米粉末作为异丁烷脱氢的催化剂

摘要 激光汽化 xCr/Al2O3 纳米粉体,粒径约为 通过 XRF、EDX、HRTEM、XRD、DD、BET、TGA、UV-Vis DRS、拉曼和 PL 光谱方法研究了 15 nm 作为异丁烷脱氢的催化体系。发现纳米粉末不仅包含位于纳米粒子表面的 Cr6+ 离子,而且还包含两种不同类型的 Cr3+ 位点作为 γ-Al2O3 固溶体的组分。一种类型由强晶体场中的块状 Cr3+b 位点组成。另一种类型是位于 xCr/Al2O3 纳米粒子表面附近的 Cr3+s 位点。这些位点处于弱晶体场中。结果表明,纳米结构的 xCr/Al2O3 体系的催化活性是由高含量的表面 Cr3+s 位点提供的。
更新日期:2020-11-01
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