Highly dispersed Cr2O3–ZrO2 binary oxide nanomaterials as novel catalysts for ethanol conversion

Mahmoud, Hala R.

doi:10.1016/j.molcata.2014.05.021

Cited by 52 publications

(11 citation statements)

References 45 publications

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“…Catalytic conversion of alcohol to hydrocarbons is effectively catalysed using highly-dispersed Cr 2 O 3 -ZrO 2 binary oxide nanomaterials. e catalytic activities of the binary oxides were found to be greater than that of pure oxides [232].…”

Section: Highly Dispersed Cr 2 O 3 -Zro 2 Binary Oxidementioning

confidence: 88%

Complex Nanomaterials in Catalysis for Chemically Significant Applications: From Synthesis and Hydrocarbon Processing to Renewable Energy Applications

Chadha

Selvaraj

Ashokan

et al. 2022

Advances in Materials Science and Engineering

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The world is rapidly changing, the resources are getting depleted, and the demand for newer technologies and products is increasing. To keep up with these new advances, highly efficient catalytic routes need to be taken to be sustainable and ensure a drawn-out existence of resources for future generations. Catalysis turns out to be a significantly important field of application when it comes to the era of nanoscience, where all devices and technologies are becoming smaller and smaller in size with improved properties. When deeming the usability of a catalyst, it is of paramount importance to have a good understanding of their properties and their synergistic effect on the other reagents in the reaction. Over the last decade, the field of nanocatalysis has grown rapidly, both in homogeneous and heterogeneous catalysis. Given that nanoparticles have a high surface-to-volume ratio when compared to bulk materials, they are appealing as catalysts. Catalysts accelerate and boost thousands of different chemical reactions on a daily basis, forming the foundation of the multibillion-dollar chemical industry worldwide, a pathway leading to green chemistry, and a novel, yet crucial, environmental protection technology. As a result, in this review, the use of nanocatalysts and the application of their special features in the renewable energy, hydrocarbon processing, and fine chemical synthesis sector was explored. A detailed explanation of the working mechanism of these nanocatalysts, starting from how they are synthesized to the effect of modification of their surface, has been put together. We have tried to collect all the current progresses in these three sectors to the best of our abilities. Furthermore, it is anticipated that this paper would be useful for future researchers and academicians wishing to contribute toward this subject of interest.

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Section: Highly Dispersed Cr 2 O 3 -Zro 2 Binary Oxidementioning

confidence: 88%

Complex Nanomaterials in Catalysis for Chemically Significant Applications: From Synthesis and Hydrocarbon Processing to Renewable Energy Applications

Chadha

Selvaraj

Ashokan

et al. 2022

Advances in Materials Science and Engineering

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“…The doublet located at the higher wavenumber is assigned to the stretching vibration of Cr-O bonds in the CrO 6 condensed octahedrons forming the lattice of Cr 2 O 3 -eskolaite, and the lower energy bands belong to deformational modes of the same polyhedron [19]. On the other hand, the spurious broad shapeless band at around 1000 cm −1 is difficult to assign unambiguously and could be attributed to M-OH stretching vibrations of the remaining impurities in the sample [18]. The SEM images of the OR, with different degrees of magnification, are illustrated in Fig.…”

Section: Characterization Of Recovered Cr 2 O 3 -Ormentioning

confidence: 99%

“…The other minor signals (in the high energy region of the IR spectrum), as the broad band lying at 3550-2000 cm −1 and at 1600 cm −1 , are due to OH-stretching and H-O-H deformation vibrations, respectively. These signals are attributed to the hydroxyl groups of the hydrated oxide surface and adsorbed water, which are highly sensitive to IR radiation [18].…”

Section: Characterization Of Waste Ar and Application As Pigmentmentioning

confidence: 99%

Green ceramic pigment based on chromium recovered from a plating waste

Gayo

Lavat

2018

Ceramics International

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The development of pigments with new formulas, departing from lower-cost raw materials, is driven by market growth and competitiveness required by the ceramic sector. In this work, the application of a residue from a metallurgical plant, containing a high amount of chromium (III) in ceramics glazes was studied. Cr 2 O 3 was successfully separated from chrome plating waste resulting in a suitable synthesize ceramic pigment, based on this chromophore. A washing treatment was applied to the residue followed by a calcination at 1000°C prior to the usage as pigment. The adequate purity of Cr 2 O 3 recovered from waste was confirmed by analytical techniques (XRF, XRD, DTA-TG, FTIR and SEM-EDX). The glasses, containing 5 wt% of recovered Cr 2 O 3 , were carried out using frits and transparent micronized glass for mono-and double firing processes. The materials were characterized by XRD and FTIR, and by the colorimetric parameters CIELab. The resulting glazes containing the waste are within the range of typical pigments based on Cr 2 O 3 in silicate and aluminate glazes for single firing, showing dark green hues in comparison with the previous data obtained from commercial grade Cr(III) oxide. However the presence of small amounts of the other chromophores in the waste modifies the tonality, affecting the purity of the chroma by increasing darkness. The leaching tests performed on the glazes suggest that Cr(III) is stable in this ceramic matrix. This results show that glazing is a suitable process for the Solidification/ Stabilization of this waste.

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“…Two series of chromia-zirconia catalysts with different Cr/Zr molar ratio were prepared by co-precipitation method [26,50]. The required amounts of ZrO(NO 3 ) 2 •2H 2 O (chemically pure) and/or Cr(NO 3 ) 3 •9H 2 O (chemically pure) were dissolved in water.…”

Section: Catalysts Preparationmentioning

confidence: 99%

Influence of Cr/Zr Ratio on Activity of Cr–Zr Oxide Catalysts in Non-Oxidative Propane Dehydrogenation

Zubkov¹,

Bugrova²,

Salaev³

et al. 2021

Crystals

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Two series of chromium–zirconium mixed oxide catalysts with different Cr/Zr molar ratio are prepared by co-precipitation method. Porous structure of the catalysts is studied by low-temperature N2 adsorption–desorption. Phase composition and chromium states in the catalysts are characterized by X-ray diffraction (XRD), UV-visible spectroscopy, and temperature-programmed reduction with hydrogen (TPR-H2). The mixed catalysts are tested in non-oxidative dehydrogenation of propane at 550 °C. The catalysts synthesized without ageing of precipitate show higher activity in propane dehydrogenation due to the higher content of reducible Cr+5/+6 species due to its stabilization on the ZrO2 surface.

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Highly dispersed Cr2O3–ZrO2 binary oxide nanomaterials as novel catalysts for ethanol conversion

Cited by 52 publications

References 45 publications

Complex Nanomaterials in Catalysis for Chemically Significant Applications: From Synthesis and Hydrocarbon Processing to Renewable Energy Applications

Complex Nanomaterials in Catalysis for Chemically Significant Applications: From Synthesis and Hydrocarbon Processing to Renewable Energy Applications

Green ceramic pigment based on chromium recovered from a plating waste

Influence of Cr/Zr Ratio on Activity of Cr–Zr Oxide Catalysts in Non-Oxidative Propane Dehydrogenation

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