Reaction-volume dependent chemistry of highly selective photocatalytic reduction of nitrobenzene
SCIE
SCOPUS
- Title
- Reaction-volume dependent chemistry of highly selective photocatalytic reduction of nitrobenzene
- Authors
- Jang, Seungwook; Jung, Bum-Joon; Kim, Mi-Jeong; Lee, Wonhee; Kim, Dong-Pyo
- Date Issued
- 2019-09
- Publisher
- ROYAL SOC CHEMISTRY
- Abstract
- Reaction-volume dependent photocatalytic reduction of nitrobenzene was investigated in various batch reactors and continuous-flow microreactors (CFMs) with different surface area to volume ratios (SA/V) under visible-light irradiation, leading to control of the photochemical reduction route, reaction speed and product selectivity. A batch reactor with less than 1.5 cm(-1) SA/V ratio produced only aniline in 96% selectivity with 40% conversion by a direct reaction route. In contrast, the CFM with an 80 cm(-1) SA/V ratio showed production of high-value azoxybenzene in 99% selectivity with 99% conversion through a condensation reaction route. In particular, a parylene thin film microreactor with a 100 mu m channel height (400 cm(-1) SA/V ratio) achieved perfect conversion and selectivity to azoxybenzene within only 50 min of reaction, compared to 20 h of reaction in the batch reactor to produce aniline. The mechanistic reaction progress was monitored by conducting time-dependent reactions of nitrobenzene and nitrosobenzene. Furthermore, the photocatalysis of various nitro-aromatic compounds also exhibited the identical reaction-volume dependent chemistry with excellent product selectivity.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/107943
- DOI
- 10.1039/c9re00251k
- ISSN
- 2058-9883
- Article Type
- Article
- Citation
- REACTION CHEMISTRY & ENGINEERING, vol. 4, no. 10, page. 1752 - 1756, 2019-09
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