Nanocatalysts deposition assisted by supercritical carbon dioxide technology: A review

Costa, Josiel Martins; Neto, Ambrósio Florêncio de Almeida

doi:10.1016/j.synthmet.2020.116627

Cited by 13 publications

(6 citation statements)

References 109 publications

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“…In supercritical conditions, the physical properties of fluids including CO 2 can be tuned by the changing the environment temperature and/or pressure. They are such as the solvating power that was affected by the density and the occurring quick mass transfer in supercritical fluids due to the high diffusivity, low viscosity, and low surface tension. − Consequently, as presented in Figures and , the difference in amounts of particle products and their curcumin contents without and with PVP addition was found when the SCCO 2 antisolvent was carried out at a constant temperature and at various operating pressures from 8 to 16 MPa. The SCCO 2 density may increase with increasing operating pressure at a constant temperature.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Curcuma xanthorrhiza Roxb Phytochemical Dissolution via Micronization Using a Supercritical Antisolvent Technique

et al. 2022

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Fine particles comprising Curcuma xanthorrhiza Roxb (C. xanthorrhiza) rhizome extract were successfully generated using a supercritical carbon dioxide (SCCO2) antisolvent technique. The SCCO2 antisolvent process was performed at 40 °C with 8–16 MPa operating pressures. The CO2 and feed solution flow rates were 15 and 0.25 mL min–1, respectively. The mixture of C. xanthorrhiza rhizome extract and a polyvinylpyrrolidone (PVP) polymer in acetone–ethanol was used as a feed solution. The collected particle products seemed to possess spherical and spherical-like morphologies with a diameter of less than 500 nm. The infrared spectroscopy analysis showed that the structural properties of C. xanthorrhiza rhizome extract did not change after treatment with the SCCO2 antisolvent. Furthermore, the addition of the PVP polymer in the C. xanthorrhiza rhizome extract particle products may improve their dissolution significantly in an aqueous solution medium.

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Section: Resultsmentioning

confidence: 99%

Enhancement of Curcuma xanthorrhiza Roxb Phytochemical Dissolution via Micronization Using a Supercritical Antisolvent Technique

et al. 2022

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“…SCF is defined as any fluid that occurs at conditions above its critical temperature and pressure (T c and P c ) with macro-homogeneous and micro-heterogeneous domains, which exhibits unique properties including the viscosity and diffusivity intermediate between liquid and gas, the density of the order of liquid, and the near zero surface tension. [38,39] Table 2 summarizes the characteristic properties of SCFs compared to those of liquids and gas conditions, suggesting the possibility of properties adjustment by tuning temperature and pressure. [40] Table 3 outlines several commercialized SCFs and their physicochemical properties.…”

Section: Sc-co 2 Low Cost With High Efficiencymentioning

confidence: 99%

Supercritical carbon dioxide technology in synthesis, modification, and recycling of battery materials

Han

Zhou

Fang

et al. 2023

Carbon Neutralization

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For pursuing the ambitious goals in the burgeoning electric vehicles, portable electronic devices, and energy storage sectors, Li-ion batteries (LIBs) are considered as one of the most promising electrochemical power sources because of their high energy density and moderate cost. Particularly, the improvement of battery materials and recycling of spent LIBs are receiving great attention since the sustainable approaches for the synthesis, modification, and recycling of battery materials are the crucial factors to the successful large-scale implementation of LIBs. In this regard, supercritical carbon dioxide (SC-CO 2 ), which possesses many merits, such as environmentally friendly, low-cost, individual chemical environment, and especially its unique physical properties, has been employed as solvent and reaction medium in the synthesis and modification of diverse functional materials. In this review, we mainly aim at compiling the applications of SC-CO 2 technology in the synthesis and modification of electrode materials as well as the recycling of LIBs. First, the unique properties and principles of SC-CO 2 technology are highlighted. Second, the latest progresses of the electrode materials design and recycling with the assistance of SC-CO 2 technique are summarized. Finally, the challenges, future directions, and perspectives on the design and development of battery materials and battery recycling by SC-CO 2 technology are proposed.

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“…Impregnation with supercritical carbon dioxide (scCO 2 ) is an effective approach for the uniform decoration and impregnation of porous materials. − ScCO 2 -assisted immobilization of metal NPs on porous materials results in high catalytic activity. − Furthermore, scCO 2 -based emerging technology allows us to obtain unique and varied morphologies, such as dispersed species, films, and high-surface-area NPs. The morphology of the products could be improved by varying the operating temperature, pressure, contact time, and CO 2 volume rate. , ScCO 2 can surpass the diffusivity and mass transfer limitations of conventional solvents and load sufficient amounts of target materials, such as metal precursors, into the pores and MOF surfaces . Currently, drying with scCO 2 is used to improve the pore stabilities of the MOFs. − Recently, immobilization techniques using catalytically active bimetallic NPs assisted by scCO 2 have been considered for the preparation of porous carbon and silica materials. − …”

Section: Introductionmentioning

confidence: 99%

“…The morphology of the products could be improved by varying the operating temperature, pressure, contact time, and CO 2 volume rate. 29 , 30 ScCO 2 can surpass the diffusivity and mass transfer limitations of conventional solvents and load sufficient amounts of target materials, such as metal precursors, into the pores and MOF surfaces. 31 Currently, drying with scCO 2 is used to improve the pore stabilities of the MOFs.…”

Section: Introductionmentioning

confidence: 99%

PdRu Bimetallic Nanoparticles/Metal–Organic Framework Composite through Supercritical CO₂–Assisted Immobilization

Matsuyama,

Matsuoka,

Eiro

et al. 2024

ACS Omega

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Metal−nanoparticle (NP)/metal−organic framework (MOF) composites have attracted considerable attention as heterogeneous catalysts. Compared with porous carbon, silica, and alumina, the charge-transfer interaction between the metal NPs and the MOF accelerated the catalytic activity. In this study, PdRu bimetallic NPs were successfully immobilized on MOFs such as MIL-101(Cr) by using supercritical carbon dioxide. The STEM-EDX images show a uniform 3D distribution of the PdRu bimetallic NPs on MIL-101(Cr). The

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Nanocatalysts deposition assisted by supercritical carbon dioxide technology: A review

Cited by 13 publications

References 109 publications

Enhancement of Curcuma xanthorrhiza Roxb Phytochemical Dissolution via Micronization Using a Supercritical Antisolvent Technique

Enhancement of Curcuma xanthorrhiza Roxb Phytochemical Dissolution via Micronization Using a Supercritical Antisolvent Technique

Supercritical carbon dioxide technology in synthesis, modification, and recycling of battery materials

PdRu Bimetallic Nanoparticles/Metal–Organic Framework Composite through Supercritical CO₂–Assisted Immobilization

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Nanocatalysts deposition assisted by supercritical carbon dioxide technology: A review

Cited by 13 publications

References 109 publications

Enhancement of Curcuma xanthorrhiza Roxb Phytochemical Dissolution via Micronization Using a Supercritical Antisolvent Technique

Enhancement of Curcuma xanthorrhiza Roxb Phytochemical Dissolution via Micronization Using a Supercritical Antisolvent Technique

Supercritical carbon dioxide technology in synthesis, modification, and recycling of battery materials

PdRu Bimetallic Nanoparticles/Metal–Organic Framework Composite through Supercritical CO2–Assisted Immobilization

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Product

Resources

About

PdRu Bimetallic Nanoparticles/Metal–Organic Framework Composite through Supercritical CO₂–Assisted Immobilization