Remarkable improvement of gas–liquid mass transfer by modifying the structure of conventional T‐junction microchannel

Sheng, Lin; Chang, Yu Cheng; Wang, Junjie; Deng, Jian; Luo, Guangsheng

doi:10.1002/aic.18089

Cited by 5 publications

(2 citation statements)

References 51 publications

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“…Increasing the gas flow rates enlarges the gas-interfacial area and reduces the thickness of liquid film (Supplementary Fig. 4 ), thus improving the mass transfer, which is in good agreement with previous studies 44 , 45 , 47 .…”

Section: Resultssupporting

confidence: 92%

Efficient conversion of propane in a microchannel reactor at ambient conditions

Li,

Zhang,

Liu

et al. 2024

Nat Commun

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The oxidative dehydrogenation of propane, primarily sourced from shale gas, holds promise in meeting the surging global demand for propylene. However, this process necessitates high operating temperatures, which amplifies safety concerns in its application due to the use of mixed propane and oxygen. Moreover, these elevated temperatures may heighten the risk of overoxidation, leading to carbon dioxide formation. Here we introduce a microchannel reaction system designed for the oxidative dehydrogenation of propane within an aqueous environment, enabling highly selective and active propylene production at room temperature and ambient pressure with mitigated safety risks. A propylene selectivity of over 92% and production rate of 19.57 mmol mCu−2 h−1 are simultaneously achieved. This exceptional performance stems from the in situ creation of a highly active, oxygen-containing Cu catalytic surface for propane activation, and the enhanced propane transfer via an enlarged gas-liquid interfacial area and a reduced diffusion path by establishing a gas-liquid Taylor flow using a custom-made T-junction microdevice. This microchannel reaction system offers an appealing approach to accelerate gas-liquid-solid reactions limited by the solubility of gaseous reactant.

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Section: Resultssupporting

confidence: 92%

Efficient conversion of propane in a microchannel reactor at ambient conditions

Li,

Zhang,

Liu

et al. 2024

Nat Commun

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“…Due to the advantages of excellent mass transfer performance, 1,2 the emerging gas–liquid microreaction technology enters its period of rapid development, 3–5 and it provides many opportunities for chemical engineers to ensure the safety and high efficiency of the chemical processes, such as oxidation, 6 halogenation, 7 and carbonylation, 8 and so forth. Compared with the inertial force and buoyant force in channels with mill‐meters or centimeters, a lot of studies have revealed the dominance of the interfacial tension and viscous force on the flow behavior with the micro‐scale.…”

Section: Introductionmentioning

confidence: 99%

General prediction models for void fraction and specific surface area of gas–liquid microflows

Sheng,

Zheng,

Chang

et al. 2023

AIChE Journal

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The flow characteristics of void fraction and specific surface area are important to predict the mass transfer and reaction performances in gas–liquid microreactors. However, the models and trends for the two parameters in different flow patterns remain ununified and insufficient. Accordingly, this work first time studies the void fraction and specific surface area in a very wide flow pattern range (Taylor, short bubble, bubbly, and bubble swarm flow). The results show that at the same gas–liquid flow rates, the void fraction decreases with bubble size in Taylor and short bubble flow but is totally opposite in bubbly and bubble swarm flow. Importantly, the variation of specific surface area with bubble size is independent of the flow pattern and decreases with bubble size. Finally, based on bubble size, two general models for the two parameters are developed. This work provides a new direction for the unification of flow characteristics.

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A Novel Bubble‐based Microreactor for Enhanced Mass Transfer Dynamics toward Efficient Electrocatalytic Nitrogen Reduction

Liu,

et al. 2023

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Electrocatalytic nitrogen reduction reaction (eNRR) is a promising method for sustainable ammonia production. Although the majority of studies on the eNRR are devoted to developing efficient electrocatalysts, it is critical to study the influence of mass transfer because of the poor N2 transfer efficiency. Herein, a novel bubble‐based microreactor (BBMR) is proposed that efficiently promotes the mass transfer behavior during the eNRR using microfluidic strategies. The BBMR possesses abundant triphasic interfaces and provides spatial confinement and accurate potential control, ensuring rapid mass transfer dynamics and improved eNRR performance, as confirmed by experimental and simulation studies. The ammonia yield of the reaction over Ag nanoparticles can be enhanced to 31.35 µg h−1 mgcat.−1, which is twice that of the H‐cell. Excellent improvements are also achieved using Ru/C and Fe/g‐CN catalysts, with 5.0 and 8.5 times increase in ammonia yield, respectively. This work further demonstrates the significant effect of mass transfer on the eNRR performance and provides an effective strategy for process enhancement through electrode design.

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Remarkable improvement of gas–liquid mass transfer by modifying the structure of conventional T‐junction microchannel

Cited by 5 publications

References 51 publications

Efficient conversion of propane in a microchannel reactor at ambient conditions

Efficient conversion of propane in a microchannel reactor at ambient conditions

General prediction models for void fraction and specific surface area of gas–liquid microflows

A Novel Bubble‐based Microreactor for Enhanced Mass Transfer Dynamics toward Efficient Electrocatalytic Nitrogen Reduction

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