Ammonia-treated activated carbon as support of Ru-Ba catalyst for ammonia synthesis

Liang, Changhai; Wei, Zhimei; Xin, Qin; Li, Can

doi:10.1023/b:reac.0000037374.92480.f1

Cited by 10 publications

(2 citation statements)

References 11 publications

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“…The nitrogen-doped carbonaceous materials can be obtained via different ways, however, the most often applied method is thermal treatment of carbonaceous precursor in the presence of nitrogen supplying agent such as urea, melamine or ammonia (Nowicki and Pietrzak 2011;Liang et al 2004;Vargas et al 2013;Seredych et al 2009;Grzybek et al 2008;Shirahama et al 2005). Very popular method is also pyrolysis and/or activation of plastics containing nitrogen species in their structure, e.g.…”

Section: Introductionmentioning

confidence: 99%

Comparison of physicochemical, sorption and electrochemical properties of nitrogen-doped activated carbons obtained with the use of microwave and conventional heating

et al. 2019

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A series of new nitrogen-doped activated carbons has been obtained via the reaction with urea and chemical activation of Polish brown coal. In order to obtain nitrogen groups bonded in different ways to the carbonaceous matrix, the modification with urea was performed at two different stages of processing, i.e. precursor or char. Additionally, the effects of conventional or microwave heating on the physicochemical parameters, sorption abilities as well as capacitance behaviour of the carbons prepared were tested. All the materials under investigation were characterized by elementary analysis, surface area measurements as well as estimation of the number of surface functional groups. The sorption properties of the materials were tested towards methylene blue at temperature of 25 °C. Moreover, symmetric supercapacitors containing organic electrolyte and prepared carbons were tested in Swagelok ® type cells by using CV, GCD and EIS methods. Depending on the variant of preparation, the final products were micro/mesoporous nitrogen-doped activated carbons of well-developed surface area ranging from 617 to 1117 m 2 /g, showing acidic or intermediate acid-base character of the surface and different contents of nitrogen functional groups varying from 1.0 to 5.6 wt%. The results obtained in this study showed that introduction of nitrogen and chemical activation of brown coal led to activated carbons with very good sorption capacity toward organic dyes as well as good electrochemical parameters. The specific capacitance was achieved up to 86 F/g for N-doped carbon obtained by microwave carbonization followed by chemical activation with potassium carbonate.

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Section: Introductionmentioning

confidence: 99%

Comparison of physicochemical, sorption and electrochemical properties of nitrogen-doped activated carbons obtained with the use of microwave and conventional heating

et al. 2019

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“…In recent time, much attention has been devoted to modified carbonaceous materials because of a huge spectrum of their applications in various branches of industry as well as everyday life. Such materials can be used not only as adsorbents of gaseous and liquid impurities, but also as catalyst, catalysts supports as well as electrode materials for electrochemical capacitors and lithium-ion batteries (Huang et al 2006;Severa et al 2018;Zaini et al 2010, Su et al 2018Liang et al 2004;Nowicki and Pietrzak 2011;Chen et al 2003). The physicochemical properties of such materials depend in significant degree on the quantity and type of heteroatomic functional groups introduced into the carbon matrix by means of different modification.…”

Section: Introductionmentioning

confidence: 99%

Application of microwave heating in the preparation of functionalized activated carbons

2019

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A series of modified carbonaceous materials has been obtained via nitrogenation, oxidation and thermal treatment of peatbased activated carbons with the use of microwave heating. In order to obtain materials characterised by diverse functional groups content, both in terms of the type and quantity, the starting material was subjected to four different treatment: (1) oxidation with nitric acid followed by heat treatment at 600 °C, (2) oxidation with hydrogen peroxide followed by heat treatment at 600 °C, (3) annealing in nitrogen atmosphere at 900 °C and (4) impregnation with urea followed by heat treatment at 800 °C. All the materials under investigation were characterised by elementary analysis, surface area measurements, estimation of the number of surface functional groups as well as by thermal analysis and photoacoustic and mass spectroscopy. Depending on the procedure of modification, the final products were activated carbons of medium developed surface area ranging from 582 to 657 m 2 /g, showing basic or intermediate acidic-basic character of the surface and different content of surface functional groups varying from 0.57 to 1.28 mmol/g. Based on thermal analysis it was shown, that sample annealed in nitrogen atmosphere is the most thermally stable material. In turn, according to the results obtained both from photoacoustic spectroscopy and mass spectroscopy, samples subjected to oxidation with HNO 3 or H 2 O 2 followed by heat treatment with using of microwave radiation are characterised by the highest content of oxygen functional groups.

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Recent Advances in Heterogeneous Catalysis for Ammonia Synthesis

2020

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Ammonia-treated activated carbon as support of Ru-Ba catalyst for ammonia synthesis

Cited by 10 publications

References 11 publications

Comparison of physicochemical, sorption and electrochemical properties of nitrogen-doped activated carbons obtained with the use of microwave and conventional heating

Comparison of physicochemical, sorption and electrochemical properties of nitrogen-doped activated carbons obtained with the use of microwave and conventional heating

Application of microwave heating in the preparation of functionalized activated carbons

Recent Advances in Heterogeneous Catalysis for Ammonia Synthesis

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