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From The Mind Come Drugs of the Future
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관리자 2022-12-08 15:00
Publication: Applied Catalysis B: Environmental
Date of Publication: 25 December 2020
Authors: Biswa Nath Bhadra, Yong Su Baek, Sunghwan Kim, Cheol Ho Choi, Sung Hwa Jhung
DOI: https://doi.org/10.1016/j.apcatb.2020.119842
Tungsten nitride-incorporated carbon (W2N(x)@C) was firstly prepared via pyrolysis of a newly developed phosphotungstic acid-loaded metal-azolate framework-6, PTA(x)@MAF-6 s. The obtained (without ammonia feeding) W2N(x)@C materials, were utilized as catalysts for oxidative denitrogenation (ODN) of fuels. The W2N(x)@C materials, especially W2N(15)@C, under ultrasound (US) irradiation was found to be a very efficient catalyst for oxidative removal of various organo-nitrogen compounds (ONCs). Importantly, the W2N(15)@C showed around 80–147 times turnover frequency those of reported catalysts for stubborn carbazole oxidation. Electron density on the N-atom of the ONCs has a dominant role in the oxidation. The oxidation mechanism was suggested mainly based on the calculated electron density of the reactants and analysis of major intermediates/products. Moreover, the US-assisted ODN was progressed by both non-radical and radical paths, as supported by the electron spin resonance and radical scavenger experiments. The recyclability of the catalyst in the US irradiative ODN was also confirmed.