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7803-57-8Relevant articles and documents
Boosting Electroreduction Kinetics of Nitrogen to Ammonia via Tuning Electron Distribution of Single-Atomic Iron Sites
Li, Yan,Li, Junwei,Huang, Junheng,Chen, Junxiang,Kong, Yan,Yang, Bin,Li, Zhongjian,Lei, Lecheng,Chai, Guoliang,Wen, Zhenhai,Dai, Liming,Hou, Yang
, p. 9078 - 9085 (2021)
Electrocatalytic nitrogen reduction reaction (NRR) plays a vital role for next-generation electrochemical energy conversion technologies. However, the NRR kinetics is still limited by the sluggish hydrogenation process on noble-metal-free electrocatalyst. Herein, we report the rational design and synthesis of a hybrid catalyst with atomic iron sites anchored on a N,O-doped porous carbon (FeSA-NO-C) matrix of an inverse opal structure, leading to a remarkably high NH3 yield rate of 31.9 μg (Formula presented.) h?1 mg?1cat. and Faradaic efficiency of 11.8 % at ?0.4 V for NRR electrocatalysis, outperformed almost all previously reported atomically dispersed metal-nitrogen-carbon catalysts. Theoretical calculations revealed that the observed high NRR catalytic activity for the FeSA-NO-C catalyst stemmed mainly from the optimized charge-transfer between the adjacent O and Fe atoms homogenously distributed on the porous carbon support, which could not only significantly facilitate the transportation of N2 and ions but also effectively decrease the binding energy between the isolated Fe atom and *N2 intermediate and the thermodynamic Gibbs free energy of the rate-determining step (*N2 → *NNH).
Vacancy Engineering of Iron-Doped W18O49 Nanoreactors for Low-Barrier Electrochemical Nitrogen Reduction
Dou, Shi Xue,Guo, Haipeng,Liang, Ji,Liu, Daolan,Liu, Jian,Lu, Gao Qing,Su, Panpan,Tong, Yueyu,Yan, Xiao,Zhou, Si
supporting information, p. 7356 - 7361 (2020/03/30)
The electrochemical nitrogen reduction reaction (NRR) is a promising energy-efficient and low-emission alternative to the traditional Haber–Bosch process. Usually, the competing hydrogen evolution reaction (HER) and the reaction barrier of ambient electrochemical NRR are significant challenges, making a simultaneous high NH3 formation rate and high Faradic efficiency (FE) difficult. To give effective NRR electrocatalysis and suppressed HER, the surface atomic structure of W18O49, which has exposed active W sites and weak binding for H2, is doped with Fe. A high NH3 formation rate of 24.7 μg h?1 mgcat?1 and a high FE of 20.0 % are achieved at an overpotential of only ?0.15 V versus the reversible hydrogen electrode. Ab initio calculations reveal an intercalation-type doping of Fe atoms in the tunnels of the W18O49 crystal structure, which increases the oxygen vacancies and exposes more W active sites, optimizes the nitrogen adsorption energy, and facilitates the electrocatalytic NRR.
AN IMPROVED PROCESS FOR PRODUCTION OF HYDRAZINE HYDRATE
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Page/Page column 13-14, (2018/04/21)
An improved process for the production of concentrated aqueous solutions of hydrazine hydrate by ketazine method is described. In particular, it describes preparation of hydrazine hydrate by ketazine method using 50-70% hydrogen peroxide, recyclable solid acetamide and ammonium acetate activator for ketazine formation and catalyst free hydrolysis of ketazine to give aqueous solutions of hydrazine hydrate in energy efficient manner.