Progress in the enhancement of gas–liquid mass transfer by porous nanoparticle nanofluids

Cheng, Shangyuan; Liu, Youzhi; Qi, Guisheng

doi:10.1007/s10853-019-03809-w

Cited by 22 publications

(13 citation statements)

References 89 publications

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“…The porous structure MCM-41 has an open structure and large specific surface area, with strong adsorption capacity. At the same update frequency, MCM-41 has higher mass transfer to CO 2 [40]. As seen in Figure 12(c), the water/air contact angles of uncalcined MCM-41 and PEI-MCM-41 were 32°and 53°, respectively.…”

Section: Co 2 Absorption In Pure Water and The Nanofluidsmentioning

confidence: 90%

Microwave Synthesis of MCM-41 and Its Application in CO₂ Absorption by Nanofluids

Cheng

2020

Journal of Nanomaterials

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Microwave synthesis method is a green chemical process with mild reaction conditions, fast reaction, and low energy consumption. In this work, an order mesoporous silica material MCM-41 was synthesized by microwave technology. Functionalized MCM-41 was prepared by wet impregnation with polyethyleneimine (PEI). XRD, SEM, TEM, DLS, N2 adsorption-desorption, FTIR, and TG were used to characterize the physicochemical properties of samples. Furthermore, CO2 absorption performance in water in the presence of uncalcined MCM-41 and PEI-MCM-41 nanoparticles was evaluated. In addition, the mechanisms of enhanced absorption were also elaborated. The experimental results indicated that the optimum conditions for preparation of MCM-41 were the microwave time of 15 min, microwave temperature of 100°C, and microwave power of 200 W. Under this condition, MCM-41 with narrow particle size distribution, average diameter of 50 nm, and SBET of 1210.3 m2g-1 was obtained. The enhancement effect of PEI-MCM-41 nanoparticles was more obvious than that of uncalcined MCM-41. PEI-MCM-41 as a promoter not only increased the CO2 diffusion rate but also enhanced the adsorption capacity due to the fact that it owns more active sites that may react with CO2. The CO2 absorption improvement of PEI-MCM-41 (0.1 wt%)/H2O was 25.35% higher than that of water.

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Section: Co 2 Absorption In Pure Water and The Nanofluidsmentioning

confidence: 90%

Microwave Synthesis of MCM-41 and Its Application in CO₂ Absorption by Nanofluids

Cheng

2020

Journal of Nanomaterials

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“…Furthermore, attempts to increase the gas‐liquid mass transfer of CH 4 , CO 2 , CO, and O 2 via the addition of nanoparticles have also been reported , . By supplementing methyl‐functionalized silica nanoparticles to syngas fermentation, the gas transfer of the least soluble H 2 was increased by 156 % .…”

Section: Advantages Of An Extended Network Of Process Routes For Gas mentioning

confidence: 99%

Gas Fermentation Expands the Scope of a Process Network for Material Conversion

Geinitz

Hüser

Mann

et al. 2020

Chemie Ingenieur Technik

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Biotechnological fermentation is a well-established process, however, it is far from being fully understood and exploited. A new area of fermentation technology that has evolved over the recent decades is gas fermentation. Many microorganisms have been reported in literature to be capable of utilizing a variety of gases such as CO, CO 2 , H 2 , and CH 4 under anaerobic or aerobic conditions as their main carbon and/or energy source. Mostly waste stream gases from industrial plants or those that can be produced via the gasification of solids are investigated. This review focuses on the currently available scientific knowledge about gas fermentation processes, particularly anaerobic syngas fermentation and aerobic methane fermentation. Gas fermentation processes are compared with aerobic and anaerobic fermentation processes based on dissolved solid substrates. Also, the potential of gas fermentation when integrated into a biotechnological network of processes is outlined.

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“…The gas-nanofluid slug flow was utilized to enhance the mass transfer of CO 2 absorption in a square microchannel, where the liquid side volumetric mass transfer coefficient with the addition of nanoparticles (i.e., 20 wt% silica) was measured to be 2.6 times of that in pure water at a high gas-liquid flow ratio (Huang et al, 2021). Several mechanisms of mass transfer enhancement in conventional reactors with the addition of nanoparticles have been proposed, including the shuttle effect, bubble breaking effect and hydrodynamic effect (Cheng et al, 2019). Typically, nanoparticles are considered to enhance the mass transfer via, e.g., its cycling in the liquid phase (thereby realizing the exchange of the adsorbed gas) or adhering on the bubble surface to avoid coalescence, which remains to be studied in depth in microreactors.…”

Section: Introductionmentioning

confidence: 99%

Gas–Liquid Slug Flow Studies in Microreactors: Effect of Nanoparticle Addition on Flow Pattern and Pressure Drop

Zong

Yue

2022

Front. Chem. Eng.

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Colloidal suspensions of nanoparticles (e.g., metals and oxides) have been considered as a promising working fluid in microreactors for achieving significant process intensification. Existing examples include their uses in microflow as catalysts for enhancing the reaction efficiency, or as additives to mix with the base fluid (i.e., to form the so-called nanofluids) for heat/mass transfer intensification. Thus, hydrodynamic characterization of such suspension flow in microreactors is of high importance for a rational design and operation of the system. In this work, experiments have been conducted to investigate the flow pattern and pressure drop characteristics under slug flow between N2 gas and colloidal suspensions in the presence of TiO2 or Al2O3 nanoparticles through polytetrafluoroethylene (PTFE) capillary microreactors. The base fluid consisted of water or its mixture with ethylene glycol. The slug flow pattern with nanoparticle addition was characterized by the presence of a lubricating liquid film around N2 bubbles, in contrast to the absence of liquid film in the case of N2-water slug flow. This shows that the addition of nanoparticles has changed the wall wetting property to be more hydrophilic. Furthermore, the measured pressure drop under N2-nanoparticle suspension slug flow is well described by the model of Kreutzer et al. (AIChE J 51(9):2428–2440, 2005) at the mixture Reynolds numbers ca. above 100 and is better predicted by the model of Warnier et al. (Microfluidics and Nanofluidics 8(1):33–45, 2010) at lower Reynolds numbers given a better consideration of the effect of film thickness and bubble velocity under such conditions in the latter model. Therefore, the employed nanoparticle suspension can be considered as a stable and pseudo single phase with proper fluid properties (e.g., viscosity and density) when it comes to the pressure drop estimation.

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Progress in the enhancement of gas–liquid mass transfer by porous nanoparticle nanofluids

Cited by 22 publications

References 89 publications

Microwave Synthesis of MCM-41 and Its Application in CO₂ Absorption by Nanofluids

Microwave Synthesis of MCM-41 and Its Application in CO₂ Absorption by Nanofluids

Gas Fermentation Expands the Scope of a Process Network for Material Conversion

Gas–Liquid Slug Flow Studies in Microreactors: Effect of Nanoparticle Addition on Flow Pattern and Pressure Drop

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Progress in the enhancement of gas–liquid mass transfer by porous nanoparticle nanofluids

Cited by 22 publications

References 89 publications

Microwave Synthesis of MCM-41 and Its Application in CO2 Absorption by Nanofluids

Microwave Synthesis of MCM-41 and Its Application in CO2 Absorption by Nanofluids

Gas Fermentation Expands the Scope of a Process Network for Material Conversion

Gas–Liquid Slug Flow Studies in Microreactors: Effect of Nanoparticle Addition on Flow Pattern and Pressure Drop

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Product

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Microwave Synthesis of MCM-41 and Its Application in CO₂ Absorption by Nanofluids

Microwave Synthesis of MCM-41 and Its Application in CO₂ Absorption by Nanofluids