Droplet‐based Continuous Flow Synthesis of Palladium Supported on Reduced Graphene Oxide

Jang, Yea Seul; Nam, Su Min; Son, Go Eun; Lee, Jihoon; Park, Chan Pil

doi:10.1002/bkcs.11966

Cited by 3 publications

(4 citation statements)

References 18 publications

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“…We think that the presence of activated carbon in the slurry may clog the microchannels of the continuous flow reactor. Hence, we used graphene oxide as the additive as it gets dispersed easily in an aqueous solution 26,27 ; however, the product yield did not improve (Table 1, entry 9). When the volume ratios of DMF and H 2 O were 2:3 and 3:2, the product yields were 60% and 58%, respectively (Table 1, entries 10 and 11).…”

Section: Resultsmentioning

confidence: 99%

C3‐Formylation of Indoles in Continuous Flow

Sung

Kim

et al. 2020

Bulletin Korean Chem Soc

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We have developed a continuous flow C3‐formylation technique for indoles using hexamethylenetetramine (HMTA) and iodine. A mixed solvent system of DMF–H2O (1:1, vol/vol) completely dissolves reagents and prevents clogging of microchannels during fluid flow. The continuous flow technique provides maximized mixing and excellent heat transfer efficiency. Thus, flow chemistry accelerates the rate of C3‐formylation of indoles in the absence of a strong acid, base, or metal catalyst. We show that high yields of C3‐formylated indoles (up to 83%) can be obtained at 150°C when the residence time is as low as 8 min.

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Section: Resultsmentioning

confidence: 99%

C3‐Formylation of Indoles in Continuous Flow

Sung

Kim

et al. 2020

Bulletin Korean Chem Soc

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“…However, in traditional batch systems, the low surface area‐to‐volume ratio limits the mass transfer of the reactants through interfaces, causing problems such as delaying the desired reaction and accelerating side reactions. Continuous flow systems with a higher surface area‐to‐volume ratio than batch systems enhance mass and heat transfer 3–7 . In addition, because of advantages such as a short diffusion distance and high mixing efficiency, the reaction time can be shortened.…”

Section: Figurementioning

confidence: 99%

Synthesis of gem‐Dichlorocyclopropanes Using Liquid–Liquid Slug Flow

Lee

Jang

Park

et al. 2021

Bulletin Korean Chem Soc

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By analyzing the causes of precipitation and clogging in continuous flow dichlorocyclopropanation, we established that the flow reaction can be performed only with T‐junctions and microtubes. Unlike tertiary amines, when quaternary ammonium salts were used as PTCs, precipitation and clogging in microchannels did not occur, and an excellent yield of up to 99% was obtained after optimizing the reaction temperature, reactant concentration, and retention time. In the scale‐up experiment, the reaction yields slightly decreased as the inner diameter (ID) of the microchannel was increased, but the calculated throughput increased from 2.41 g/h (ID: 1.5 mm) to 3.46 g/h (ID: 1.9 mm) and 5.13 g/h (ID: 2.4 mm)

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“…Proton exchange membrane fuel cells (PEMFCs) have received increasing considerations owing to the high energy conversion efficiency and carbon‐free emission to meet the demands for environmental‐friendly energy systems 1–5 . Oxygen reduction reaction (ORR) occurring at the cathode of PEMFCs has been recognized as a major bottleneck due to the sluggish electron‐transfer kinetics that limits the cell performance 6–9 .…”

Section: Figurementioning

confidence: 99%

“…Proton exchange membrane fuel cells (PEMFCs) have received increasing considerations owing to the high energy conversion efficiency and carbon-free emission to meet the demands for environmental-friendly energy systems. [1][2][3][4][5] Oxygen reduction reaction (ORR) occurring at the cathode of PEMFCs has been recognized as a major bottleneck due to the sluggish electron-transfer kinetics that limits the cell performance. [6][7][8][9] While platinum (Pt) is the most active catalyst toward the ORR, 10,11 palladium (Pd) has also received considerable attention as one of potential electrocatalysts for ORR in acidic and alkaline media.…”

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confidence: 99%