Solution Combustion Synthesis of nanoscale Cu-Cr-O spinels: Mechanism, properties and catalytic activity in CO oxidation

Новиков, В. А.; Xanthopoulou, Galina; Knysh, Yu. A.; Amosov, A. P.

doi:10.1016/j.ceramint.2017.06.004

Cited by 20 publications

(10 citation statements)

References 28 publications

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“…The correlation between structural alterations that take place during combustion and properties of final nanocomposite material was examined by physico‐chemical analysis, where it was demonstrated that the surface area and the composition of the catalyst, affect the SCS catalysts activity towards CO conversion in a complex way − as it is not in all cases either surface area or composition is the most important factor. The coexistence of two oxidative states of copper Cu + /Cu 2+ is considered to be an active site for the catalytic oxidation as a result of the adsorption of CO to the low valence copper atoms in CuCrO 2 …”

Section: Oxidation Reactionsmentioning

confidence: 99%

Review of Recent Studies on Solution Combustion Synthesis of Nanostructured Catalysts

et al. 2018

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Solution combustion synthesis (SCS) is a relatively new method for synthesizing catalytic materials with many distinct advantages: simplicity of method, short reaction times, and the capability to regulate crystal lattice parameters and thereby the activity and selectivity of catalysts. Over the last years, SCS has been used for the production and study of a multitude of new catalytic materials. This review considers and discusses the recent developments and trends in SCS of nanocatalysts, while special attention is paid to the development and applications of nanostructured catalysts.

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Section: Oxidation Reactionsmentioning

confidence: 99%

Review of Recent Studies on Solution Combustion Synthesis of Nanostructured Catalysts

et al. 2018

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“…Antibacterial, electrochemical, and catalytic applications of SCS-produced copper chromite spinels have been explored in [10][11][12][13][14]. Recently [15,16], we suggested to use copper chromite and nickel chromite spinels as catalysts for the process of carbon monoxide oxidation.…”

Section: Introductionmentioning

confidence: 99%

Solution Combustion Synthesis of Nanostructured NiCr2O4 Spinel and Its Catalytic Activity in CO Oxidation

Новиков

Xanthopoulou

Amosov

2021

Int. J Self-Propag. High-Temp. Synth.

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Nanoscale NiCr 2 O 4 spinel powders were prepared by solution combustion synthesis (SCS) from aqueous solutions of chromium/nickel nitrates as oxidants, urea as a fuel, and nitric acid and characterized by SEM/EDS, XRD, and porosity measurements. The catalytic activity of synthesized powders in conversion of CO to CO 2 was determined and compared with that of supported Pd catalysts. An optimized composition of starting solution afforded for preparation of powders containing 93% of NiCr 2 O 4 spinel without additional calcining. This powder showed good CO-to-CO 2 conversion in the temperature range 150-300°С and can be recommended for practical implementation.

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“…In order to create a cost-effective and efficient catalyst for VOC oxidation, scientists are investigating such metals as Cr [ 10 , 11 ], Zn [ 12 ], Fe, Co [ 13 , 14 , 15 ], Cu [ 16 , 17 ], Mn [ 18 ], and others. One of the widely studied metals is chromium, which not only possesses efficient redox properties but is also economically attractive due to the low cost [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Thermal Stability, and Catalytic Activity of Compounds Formed in CaO-SiO2-Cr(NO3)3-H2O System

et al. 2020

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In this work, the thermal stability, microstructure, and catalytic activity in oxidation reactions of calcium silicate hydrates formed in the CaO-SiO2-Cr(NO3)3-H2O system under hydrothermal conditions were examined in detail. Dry primary mixture with a molar ratio of CaO/SiO2 = 1.5 was mixed with Cr(NO3)3 solution (c = 10 g Cr3+/dm3) to reach a solution/solid ratio of the suspension of 10.0:1. Hydrothermal synthesis was carried out in unstirred suspensions at 175 °C for 16 h. It was determined that, after treatment, semicrystalline calcium silicate hydrates C-S-H(I) and/or C-S-H(II) with incorporated Cr3+ ions (100 mg/g) were formed. The results of in situ X-ray diffraction and simultaneous thermal analyses showed that the products were stable until 500 °C, while, at higher temperatures, they recrystallized to calcium chromate (CaCrO4, 550 °C) and wollastonite (800–850 °C). It was determined that both the surface area and the shape of the dominant pore changed during calcination. Propanol oxidation experiments showed that synthetic semicrystalline calcium silicate hydrates with intercalated chromium ions are able to exchange oxygen during the heterogeneous oxidation process. The obtained results were confirmed by XRD, STA, FT-IR, TEM, SEM, and BET methods, and by propanol oxidation experiments.

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Solution Combustion Synthesis of nanoscale Cu-Cr-O spinels: Mechanism, properties and catalytic activity in CO oxidation

Cited by 20 publications

References 28 publications

Review of Recent Studies on Solution Combustion Synthesis of Nanostructured Catalysts

Review of Recent Studies on Solution Combustion Synthesis of Nanostructured Catalysts

Solution Combustion Synthesis of Nanostructured NiCr2O4 Spinel and Its Catalytic Activity in CO Oxidation

Microstructure, Thermal Stability, and Catalytic Activity of Compounds Formed in CaO-SiO2-Cr(NO3)3-H2O System

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