Study on reduction behavior of two-component Fe Mg O oxide system prepared via a sol-gel technique

Karnaukhov, Timofey M.; Vedyagin, Aleksey A.; Cherepanova, Svetlana V.; Rogov, Vladimir A.; Stoyanovskii, Vladimir O.; Mishakov, Ilya V.

doi:10.1016/j.ijhydene.2017.11.036

Cited by 11 publications

(5 citation statements)

References 43 publications

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“…In this case, the second component should be further introduced in the form of organometallic compounds [ 18 ], which are exotic and expensive precursors. An alternative approach has been reported in a number of recent publications [ 19 , 20 , 21 , 22 , 23 ]. In these papers, the hydrolysis stage was efficiently performed using an aqueous solution of the inorganic salt precursor.…”

Section: Introductionmentioning

confidence: 99%

Preparation of the Nanostructured Ni-Mg-O Oxide System by a Sol–Gel Technique at Varied pH

et al. 2022

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In the present work, a series of two-component Ni-Mg-O oxide systems were prepared using a sol–gel technique at varied pH of hydrolysis procedure. The aqueous solutions of nitric acid or ammonia were added to control the pH values. The xerogel samples obtained after drying were analysed using a thermogravimetric approach. The oxide systems were characterized by a set of physicochemical methods (low-temperature nitrogen adsorption, X-ray diffraction analysis, scanning electron microscopy, UV-vis spectroscopy, and temperature-programmed reduction method). The thermal stability of the samples was examined in a testing reaction of CO oxidation in a prompt thermal aging regime. It was revealed that the pH value during the magnesium methoxide hydrolysis stage significantly affects the properties of the intermediate hydroxide and final oxide nanomaterials. The thermal decomposition of nitric acid or ammonia is accompanied by exothermal effects, which noticeably influence the textural characteristics. Moreover, the pH of the hydrolysing solution defines the strength of the nickel interaction with the MgO matrix. An increase in pH facilitates the formation of the NixMg1−xO solid solution with a higher amount of incorporated nickel, which is characterized by the reproducible broad temperature range of the hydrogen uptake and the enhanced thermal stability.

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Section: Introductionmentioning

confidence: 99%

Preparation of the Nanostructured Ni-Mg-O Oxide System by a Sol–Gel Technique at Varied pH

et al. 2022

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“…The sol-gel techniques give a number of advantages, including the mentioned small particle size and uniform distribution of one component within the matrix of another component serving as the support. Recently, such a sol-gel approach was successfully applied to prepare the two- and three-component oxide systems based on the MgO matrix [ 57 , 58 , 59 , 60 ]. Magnesium oxide is a unique material possessing attractive textural characteristics such as developed specific surface area and porosity.…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel Synthesis and Characterization of the Cu-Mg-O System for Chemical Looping Application

et al. 2022

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A sol-gel technique was applied to prepare the two-component oxide system Cu-Mg-O, where MgO plays the role of oxide matrix, and CuO is an active chemical looping component. The prepared samples were characterized by scanning electron microscopy, low-temperature nitrogen adsorption, and X-ray diffraction analysis. The reduction behavior of the Cu-Mg-O system was examined in nine consecutive reduction/oxidation cycles. The presence of the MgO matrix was shown to affect the ability of CuO towards reduction and re-oxidation significantly. During the first reduction/oxidation cycle, the main characteristics of the oxide system (particle size, crystallization degree, etc.) undergo noticeable changes. Starting from the third cycle, the system exhibits a stable operation, providing the uptake of similar hydrogen amounts within the same temperature range. Based on the obtained results, the two-component Cu-Mg-O system can be considered as a prospective chemical looping agent.

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“…Motivated by manifestations mentioned above, in this investigation, a simple hydrothermal route has been adopted for the synthesis of rGO supported Fe/MgO nanocomposites followed by heat treatment at different temperatures at Argon (Ar) atmosphere. Several extensive studies have been carried out to synthesize nanoscale MgO powders using different synthesis techniques, such as solid state, sol-gel, chemical precipitation method, etc [48][49][50]. Among various methods, the hydrothermal technique is regarded as one of the most successful approaches to obtain the desired structures with high phase purity and uniform size distribution with an additional advantage of being low cost [51].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic water splitting ability of Fe/MgO-rGO nanocomposites towards hydrogen evolution

Sharmin

Roy

Basith

2021

International Journal of Hydrogen Energy

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Study on reduction behavior of two-component Fe Mg O oxide system prepared via a sol-gel technique

Cited by 11 publications

References 43 publications

Preparation of the Nanostructured Ni-Mg-O Oxide System by a Sol–Gel Technique at Varied pH

Preparation of the Nanostructured Ni-Mg-O Oxide System by a Sol–Gel Technique at Varied pH

Sol-Gel Synthesis and Characterization of the Cu-Mg-O System for Chemical Looping Application

Photocatalytic water splitting ability of Fe/MgO-rGO nanocomposites towards hydrogen evolution

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