Promoted mesoporous Fe-alumina catalysts for the non-oxidative dehydrogenation of isobutane

Venugopalan, Aswathy Thareparambil; Prabu, K.M.; Gupta, Nikitra N.; Raja, Thirumalaiswamy

doi:10.1016/j.catcom.2020.106263

Cited by 8 publications

(2 citation statements)

References 34 publications

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“…Nanoporous materials have been widely used in chemical environmental [1], biomedical [2] and functional materials fields, because of their large specific surface and good adsorption capacity. Among them, the nanoporous alumina material shows a huge potential to be used as catalyst [3] [4] catalyst support [5] [6] and absorbent. It has excellent structural properties which is conducive to the diffusion and reaction of macromolecules, and it's surface acid-base properties allows it support metal active components, that lead to high catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Nanoporous Alumina by an Intelligent Gel Template

Wang

2024

HSET

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In this research, an novel green method for one-step synthesis of nanoporous alumina based on an intelligent recyclable template, which has sensitive response to temperature and can be easily removed from product and recycled to reuse by its phase changes with temperature, was applied. Using NaAlO2 as the aluminum source and temperature-sensitive intelligent gel methylcellulose (MC) as the template, the nanoporous alumina products with large specific surface area, narrow pore size distribution and worm-like pore channels were successfully prepared. And the influence of reaction time, template concentration and NaAlO2 solution concentration on the preparation of nanoporous alumina was studied.

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Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Nanoporous Alumina by an Intelligent Gel Template

Wang

2024

HSET

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“…It is known that heterogeneous iron-based catalysts are widely used in dehydrogenation reactions, particularly, in the dehydrogenation of propane to propylene [9][10][11]. In some works, nanostructured Fe and Fe-Zn/Al 2 O 3 systems served as the catalysts for isobutane dehydrogenation [12,13]. In [14] it was reported that for Fe/SiO 2 catalysts, single iron sites embedded in a silica matrix were responsible for methane conversion exclusively to ethylene and aromatics.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, spectroscopic and catalytic properties of FeO x /Al 2 O 3 nanopowders prepared by cw CO 2 laser vaporization

Baronskiy

Kostyukov

Zhuzhgov

et al. 2022

Preprint

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Nanostructured powders xFe/nano-Al2O3 with the Fe loading of x = 0,0–5,0 wt% were obtained using laser vaporization by a cw CO2 laser. XRF, XRD, HRTEM, PL and UV-vis DRS techniques were employed to investigate physicochemical, structural and optical properties of the synthesized nanopowders with the average particle size of 9 nm. Nanopowders xFe/nano-Al2O3 as model catalysts were tested in isobutane dehydrogenation reaction. The results obtained were compared with similar data for the xFe/γPb-Al2O3 systems synthesized by the conventional sol-gel method. According to XRD and UV-vis DRS data, in the series of xFe/nano-Al2O3 samples a great part of Fe3+ ions is in the disordered environment of subsurface layers of Al2O3 nanocrystallites predominantly in tetrahedral coordination. In distinction to samples of the xFe/γPb-Al2O3 series, in the case of nanostructured xFe/nano-Al2O3 powders the formation of Fe2O3 phase does not occur at any concentrations of iron or conditions of testing. The analysis of the PL spectra of xFe/nano-Al2O3 powders also showed the presence of surface sites of Fe3+ ions, which were not detected for xFe/γPb-Al2O3. Catalytic testing of the xFe/nano-Al2O3 series samples in isobutane dehydrogenation revealed the formation of the iron active sites that ensure catalytic activity of the samples. Differences in the catalytic properties of FeOx/Al2O3 samples obtained by the sol-gel method and laser vaporization are related to different states of Fe3+ ions. Thus, the xFe/nano-Al2O3 nanopowders in contrast to xFe/γPb-Al2O3 contain a large amount of active Fe3+ sites. These sites involved in the dehydrogenation reaction are present predominantly on the surface of the nanopowders.

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