The facile synthesis of Ni–Cu catalysts stabilized in SiO2 framework via a supercritical antisolvent approach

Nesterov, N. S.; Paharukova, V.P.; Yakovlev, V. А.; Martyanov, Oleg N.

doi:10.1016/j.supflu.2016.03.003

Cited by 22 publications

(13 citation statements)

References 40 publications

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“…In addition, Nesterov and coworkers proposed an approach for the synthesis of multicomponent Ni-Cu catalysts with silica-based frameworks using the SAS process. Moreover, this approach also addressed the agglomeration issue by various conventional preparation methods, resulting in the size reduction of the large-sized nanoparticles [ 49 , 50 ]. In an attempt to regulate the precipitation of reactants by the dense scCO 2 -based anti-solvent route, Hutching and colleagues had studied the fabrication of various types of inorganic nanoparticles, including titanium dioxide (TiO 2 ) [ 51 ], CeO 2 [ 52 ], copper/zinc oxide/aluminum trioxide (Cu/ZnO/Al 2 O 3 ) as catalysts [ 53 ].…”

Section: Preparation Of Diverse Inorganic-based Materialsmentioning

confidence: 99%

Role of supercritical carbon dioxide (scCO₂) in fabrication of inorganic-based materials: a green and unique route

Líu

Chen

Pan

et al. 2021

Science and Technology of Advanced Materials

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In recent times, the supercritical carbon dioxide (scCO 2 ) process has attracted increasing attention in fabricating diverse materials due to the attractive features of environmentally benign nature and economically promising character. Owing to these unique characteristics and high-penetrability, as well as diffusivity conditions of scCO 2 , this high-pressure technology, with mild operation conditions, cost-effective, and non-toxic, among others, is often applied to fabricate various organic and inorganic-based materials, resulting in the unique crystal architectures (amorphous, crystalline, and heterojunction), tunable architectures (nanoparticles, nanosheets, and aerogels) for diverse applications. In this review, we give an emphasis on the fabrication of various inorganic-based materials, highlighting the recent research on the driving factors for improving the quality of fabrication in scCO 2 , procedures for production and dispersion in scCO 2 , as well as common indicators utilized to assess quality and processing ability of materials. Next, we highlight the effects of specific properties of scCO 2 towards synthesizing the highly functional inorganic-based nanomaterials. Finally, we summarize this compilation with interesting perspectives, aiming to arouse a more comprehensive utilization of scCO 2 to broaden the horizon in exploring the green/eco-friendly processing of such versatile inorganic-based materials. Together, we firmly believe that this compilation endeavors to disclose the latent capability and universal prevalence of scCO 2 in the synthesis and processing of inorganic-based materials.

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Section: Preparation Of Diverse Inorganic-based Materialsmentioning

confidence: 99%

Role of supercritical carbon dioxide (scCO₂) in fabrication of inorganic-based materials: a green and unique route

Líu

Chen

Pan

et al. 2021

Science and Technology of Advanced Materials

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show abstract

“…ScCO 2 can be used as anti-solvent to precipitate oxide-based materials [45][46][47][48][49][50][51][52][53][54][55]. One way to obtain a precipitate is to expand a scCO 2 -saturated solution of metal (or Si) precursor(s) into a low-pressure environment.…”

Section: Scco 2 As Anti-solventmentioning

confidence: 99%

“…The other way to obtain a precipitate using scCO 2 as anti-solvent involves the expansion of the metal or silicon precursor(s) solution through a nozzle, directly into the scCO 2 medium ( Figure 5) [48]. Under these conditions, the solution and scCO 2 rapidly diffuse into each other and cause the solute to precipitate quickly.…”

Section: Scco 2 As Anti-solventmentioning

confidence: 99%

“…As soon as the droplet and scCO 2 came into contact with each other, the solute precipitated due to the decreased solubility in the scCO 2 -rich medium [49,51]. This route was also used to synthesise SiO 2 -supported metal nanoparticles by spraying a silica sol together with a solution of the metal precursor into the scCO 2 phase [48].…”

Section: Scco 2 As Anti-solventmentioning

confidence: 99%

“…This route was also used to synthesise SiO2-supported metal nanoparticles by spraying a silica sol together with a solution of the metal precursor into the scCO2 phase. [48]…”

Section: Scco2 As Anti-solventmentioning

confidence: 99%

See 2 more Smart Citations

Nanostructured Oxides Synthesised via scCO2-Assisted Sol-Gel Methods and Their Application in Catalysis

Tao

Pescarmona

2018

Catalysts

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Nanostructured metal oxides and silicates are increasingly applied in catalysis, either as supports or as active species in heterogeneous catalysts, owing to the physicochemical properties that typically distinguish them from bulk oxides, such as higher surface area and a larger fraction of coordinatively unsaturated sites at their surface. Among the different synthetic routes for preparing these oxides, sol-gel is a relatively facile and efficient method. The use of supercritical CO 2 (scCO 2) in the sol-gel process can be functional to the formation of nanostructured materials. The physical properties of the scCO 2 medium can be controlled by adjusting the processing temperature and the pressure of CO 2 , thus enabling the synthesis conditions to be tuned. This paper provides a review of the studies on the synthesis of oxide nanomaterials via scCO 2-assisted sol-gel methods and their catalytic applications. The advantages brought about by scCO 2 in the synthesis of oxides are described, and the performance of oxide-based catalysts prepared by scCO 2 routes is compared to their counterparts prepared via non-scCO 2-assisted methods.

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Reactivation of Ni‐TiO₂ catalysts in hydrogen flow and in supercritical 2‐propanol—Comparative study by electron spin resonance in situ

Kandarakova,

Yakushkin,

Nesterov

et al. 2023

Magnetic Reson in Chemistry

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Highly dispersed Ni‐TiO2 catalyst has been studied in the process of preparation and under catalytic transfer hydrogenation reaction conditions in supercritical 2‐propanol (250°C, 70 bar) using electron spin resonance in situ. Electron spin resonance in situ has been used to study the process of the catalyst passivation and subsequent reduction of the oxide layer in the gas flow. Reduction of the NiO layer on the surface of passivated Ni nanoparticles has been detected in supercritical 2‐propanol, which is in agreement with kinetic modeling data. It has been found that the reduction of the nickel oxide layer in supercritical 2‐propanol occurs at a lower temperature compared with the reduction in hydrogen flow, according to in situ electron spin resonance study.

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The facile synthesis of Ni–Cu catalysts stabilized in SiO2 framework via a supercritical antisolvent approach

Cited by 22 publications

References 40 publications

Role of supercritical carbon dioxide (scCO₂) in fabrication of inorganic-based materials: a green and unique route

Role of supercritical carbon dioxide (scCO₂) in fabrication of inorganic-based materials: a green and unique route

Nanostructured Oxides Synthesised via scCO2-Assisted Sol-Gel Methods and Their Application in Catalysis

Reactivation of Ni‐TiO₂ catalysts in hydrogen flow and in supercritical 2‐propanol—Comparative study by electron spin resonance in situ

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The facile synthesis of Ni–Cu catalysts stabilized in SiO2 framework via a supercritical antisolvent approach

Cited by 22 publications

References 40 publications

Role of supercritical carbon dioxide (scCO2) in fabrication of inorganic-based materials: a green and unique route

Role of supercritical carbon dioxide (scCO2) in fabrication of inorganic-based materials: a green and unique route

Nanostructured Oxides Synthesised via scCO2-Assisted Sol-Gel Methods and Their Application in Catalysis

Reactivation of Ni‐TiO2 catalysts in hydrogen flow and in supercritical 2‐propanol—Comparative study by electron spin resonance in situ

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Product

Resources

About

Role of supercritical carbon dioxide (scCO₂) in fabrication of inorganic-based materials: a green and unique route

Role of supercritical carbon dioxide (scCO₂) in fabrication of inorganic-based materials: a green and unique route

Reactivation of Ni‐TiO₂ catalysts in hydrogen flow and in supercritical 2‐propanol—Comparative study by electron spin resonance in situ