Catalytic Applications of CeO2-Based Materials

Vita, Antonio

doi:10.3390/catal10050576

Cited by 29 publications

(18 citation statements)

References 18 publications

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“…Thermal decomposition of the MWCNTs backbone slightly shifted to the lower temperature regions, where three overlapping stages can be identified (316-422 • C, 422-545 • C, 545-700 • C). The observed shift to lower thermal stability can be explained by the increased catalytic activity due to the simultaneous presence of CeO 2 and V 2 O 5 catalysts [55]. Overall, the addition of V 2 O 5 particles significantly decreased the thermal stability of MWCNTs.…”

Section: Thermogravimetric Analysis Resultsmentioning

confidence: 92%

“…However, the increased mass loss of the third stage (360-485 • C) could be indicative of the increased ratio of MWCNT particles having slightly smaller thermal stability. This effect could be related to the thermal activation of CeO 2 catalyst at elevated temperatures, resulting in a slightly enhanced pyrolysis of CNTs [54,55].…”

Section: Thermogravimetric Analysis Resultsmentioning

confidence: 99%

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V2O5, CeO2 and Their MWCNTs Nanocomposites Modified for the Removal of Kerosene from Water

et al. 2022

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In this paper, the application of multiwalled carbon nanotubes (MWCNTs) based on metal oxide nanocomposites as adsorbents for the removal of hydrocarbons such as kerosene from water was investigated. Functionalized MWCNTs were obtained by chemical oxidation using concentrated sulfuric and nitric acids. V2O5, CeO2, and V2O5:CeO2 nanocomposites were prepared using the hydrothermal method followed by deposition of these oxides over MWCNTs. Individual and mixed metal oxides, fresh MWCNTs, and metal oxide nanoparticle-doped MWCNTs using different analysis techniques were characterized. XRD, TEM, SEM, EDX, AFM, Raman, TG/DTA, and BET techniques were used to determine the structure as well as chemical and morphological properties of the newly prepared adsorbents. Fresh MWCNTs, Ce/MWCNTs, V/MWCNTs, and V:Ce/MWCNTs were applied for the removal of kerosene from a model solution of water. GC analysis indicated that high kerosene removal efficiency (85%) and adsorption capacity (4270 mg/g) after 60 min of treatment were obtained over V:Ce/MWCNTs in comparison with fresh MWCNTs, Ce/MWCNTs and V/MWCNTs. The kinetic data were analyzed using the pseudo-first order, pseudo-second order, and intra-particle diffusion rate equations.

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Section: Thermogravimetric Analysis Resultsmentioning

confidence: 92%

Section: Thermogravimetric Analysis Resultsmentioning

confidence: 99%

V2O5, CeO2 and Their MWCNTs Nanocomposites Modified for the Removal of Kerosene from Water

et al. 2022

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“…5 It is an abundantly available rare-earth metal used prolifically in various engineering and biological applications. 6 It exhibits catalytic properties 7,8 and is widely used in solid-oxide fuel cells. 9 Recently it has gained popularity in biomedical applications due to its antioxidant properties.…”

Section: Introductionmentioning

confidence: 99%

Process of Incorporation of Cerium Oxide in Viscose to Spin Infrared Reflecting Viscose Fibers

Sharma

Agarwal

Ralebhat

et al. 2022

AATCC Journal of Research

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The concept of leveraging the optical properties of cerium oxide into viscose fibers was demonstrated in this study. The process of dispersing cerium oxide particles uniformly into viscose dope prior to viscose fiber spinning was studied in detail. Cerium oxide powder was dispersed in the chosen media using mechanical treatments such as ball milling and ultrasonication. These experiments were carried out at two extreme pH values to replicate the viscose spinning bath (acidic pH 5) and viscose dope (alkaline pH 13). The dispersion was characterized for particle size and surface charge properties. A combination of the mechanical treatments synergistically reduced the cerium oxide particle size in acidic and alkaline pH from 1300 to 290 nm and from 1040 to 280 nm, respectively. Three surfactants of different ionic natures were evaluated for stabilizing the cerium oxide dispersions. The effects on the particle size of cerium oxide in two dispersion environments, that is, aqueous and polymeric media, were studied through conventional as well as novel visual characterization techniques. The phosphate ether-based anionic surfactant was found to significantly reduce the dispersed particle size and effectively stabilize the dispersion better, which was validated through a pressure buildup monitoring system during viscose fiber spinning. The surfactant-stabilized cerium oxide dispersion was used to get functional infrared reflecting viscose fibers. To characterize this effect, a direct visual evaluation was done through an infrared camera which indicated a significant improvement of infrared reflectivity and a 2.5–3°C surface temperature buildup of the cerium-oxide viscose fibers in comparison to regular viscose fibers. The infrared reflective property of cerium oxide imparts a thermal insulation effect which was found to increase to a thermal insulating value of 90 in the case of cerium oxide viscose fibers compared with a thermal insulating value of 79 in regular viscose fibers, as measured by the KESF Thermolabo II instrument. This study can very well be extended to many fiber-making processes where an understanding of interfacial interactions of additives with cellulose is critical to impart functionality to viscose fibers.

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“…Cerium-based oxides have played an important role in several industrial applications, 1,2 which spread from catalytic 3,4 to biomedical applications. 5,6 Recently, G. Lu et al highlighted its importance in electrocatalysis, namely, in the hydrogen and oxygen evolution reactions.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics investigation of the structural and energetic properties of CeO₂–MO_x (M = Gd, La, Ce, Zr) nanoparticles

et al. 2021

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Catalytic Applications of CeO2-Based Materials

Abstract: Among the metal-oxides, ceria represents one of the most promising materials for chemical transformations mainly for environmental applications and energy conversion systems [...]

Cited by 29 publications

References 18 publications

V2O5, CeO2 and Their MWCNTs Nanocomposites Modified for the Removal of Kerosene from Water

V2O5, CeO2 and Their MWCNTs Nanocomposites Modified for the Removal of Kerosene from Water

Process of Incorporation of Cerium Oxide in Viscose to Spin Infrared Reflecting Viscose Fibers

Molecular dynamics investigation of the structural and energetic properties of CeO₂–MO_x (M = Gd, La, Ce, Zr) nanoparticles

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Catalytic Applications of CeO2-Based Materials

Abstract: Among the metal-oxides, ceria represents one of the most promising materials for chemical transformations mainly for environmental applications and energy conversion systems [...]

Cited by 29 publications

References 18 publications

V2O5, CeO2 and Their MWCNTs Nanocomposites Modified for the Removal of Kerosene from Water

V2O5, CeO2 and Their MWCNTs Nanocomposites Modified for the Removal of Kerosene from Water

Process of Incorporation of Cerium Oxide in Viscose to Spin Infrared Reflecting Viscose Fibers

Molecular dynamics investigation of the structural and energetic properties of CeO2–MOx (M = Gd, La, Ce, Zr) nanoparticles

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Molecular dynamics investigation of the structural and energetic properties of CeO₂–MO_x (M = Gd, La, Ce, Zr) nanoparticles