Sol–gel synthesis and characterization of two-component systems based on MgO

Vedyagin, Aleksey A.; Mishakov, Ilya V.; Karnaukhov, Timofey M.; Krivoshapkina, Elena F.; Ilyina, Ekaterina V.; Maksimova, T. A.; Cherepanova, Svetlana V.

doi:10.1007/s10971-017-4321-3

Cited by 19 publications

(11 citation statements)

References 34 publications

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“…The next step: hydrolysis of magnesium methoxide, was performed dropwise using an aqueous solution of nickel nitrate instead of distilled water. This approach was recently reported as an effective route to prepare two-component systems [ 20 ]. It should be noted that the as-prepared solution of Ni(NO 3 ) 2 has a pH value of nearly 5.…”

Section: Methodsmentioning

confidence: 99%

“…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%

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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: Methodsmentioning

confidence: 99%

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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“…As a result, the second process occurs at lower temperatures if compared with the magnesium hydroxide systems reported in the literature [75,76]. As recently found [61], the intercalation of Cu 2+ ions into the interlayer space of Mg(OH) 2 simplifies the dehydration process. The last weight loss of 1.9 wt% is connected to the elimination of the residual species of organic molecules (toluene and methanol) [77].…”

Section: Resultsmentioning

confidence: 75%

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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“…Recently, we reported the application of the sol-gel method for the preparation of two-component MgO-based systems [ 29 , 30 , 31 , 32 , 33 ]. The preparation procedures included the hydrolysis of magnesium methoxide in a methanol/toluene solution, the drying of the formed gel in air (or supercritical drying), and the calcination of the xerogel in a muffle.…”

Section: Introductionmentioning

confidence: 99%

“…Initially, the approach considered the hydrolysis of magnesium methoxide by water with the subsequent addition of an organic precursor of the second component [ 29 ]. In recent works, an aqueous solution of an inorganic precursor of the second component was used instead of pure water during the hydrolysis stage [ 30 , 31 , 32 , 33 ]. In the present research, this modified approach was applied to prepare the nanoparticles of Ni and Mo oxides distributed within the MgO matrix.…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel-Prepared Ni-Mo-Mg-O System for Catalytic Transformation of Chlorinated Organic Wastes into Nanostructured Carbon

et al. 2020

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The present work aimed to prepare Ni-Mo particles distributed within the MgO matrix. With this purpose in mind, a ternary Ni-Mo-Mg oxide system was synthesized by a sol−gel approach. The samples were studied by low-temperature nitrogen adsorption, X-ray diffraction analysis, and transmission electron microscopy equipped with energy dispersive X-ray analysis. Both the nickel and molybdenum species in the prepared samples were characterized by a fine and uniform distribution. The diffraction pattern of the ternary system was predominantly represented by the MgO reflections. The catalytic activity of the samples was tested in the decomposition of 1,2-dichloroethane used as a representative of the chlorinated organic wastes. The nanostructured carbon filaments resulting from the decomposition of the halogenated substrate were found to be characterized by a narrow diameter distribution, according to the transmission electron microscopy data, thus confirming the fine distribution of the active Ni-Mo particles. The results obviously show the advantages of the sol−gel technique for obtaining efficient catalysts.

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Sol–gel synthesis and characterization of two-component systems based on MgO

Cited by 19 publications

References 34 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

Sol-Gel-Prepared Ni-Mo-Mg-O System for Catalytic Transformation of Chlorinated Organic Wastes into Nanostructured Carbon

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