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Thermogravimetric Analysis of Carbon Sorbents Modified by Ammonium Bromide

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Abstract

The thermal stability of carbon sorbents modified by ammonium bromide is investigated. The sorbent is produced from D coal by alkaline activation at 800°C with 1 h holding, when the coal/KOH mass ratio is 1.0. This sorbent is microporous, with a high specific surface (1340 m2/g). The sorbent is modified by steeping with ammonium bromide solution of different concentrations (1, 2, and 4%). Such modification changes all the textural characteristics of the sorbent. The specific surface SBET and total pore volume VΣ decrease. Thermogravimetric analysis establishes the temperature limits on oxidative pyrolysis of the sorbent samples: the ignition temperature and complete combustion temperature. Taking account of the time parameters, the ignition and combustion indices are calculated. It is found that increase in concentration of the ammonium bromide solution is accompanied by increase in the ignition temperature Tig of the samples and also the temperature T1 at which mass loss begins. In addition, the ignition index D and combustion index S increase. The results show that modification of the sorbents with ammonium bromide raises the threshold of oxidative pyrolysis.

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ACKNOWLEDGMENTS

This research was conducted on equipment at the Collective Use Center of the Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences.

We thank L.M. Khitsova for conducting the thermogravimetric analysis and V.Yu. Malysheva for performing the elemental analysis.

Funding

Financial support was provided within the framework of state funding for the Institute of Coal and Materials Science, Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences (project 121031500194-5).

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  1. Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, Kemerovo, Russia

    N. I. Fedorova & I. Yu. Zykov

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  1. N. I. Fedorova
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  2. I. Yu. Zykov
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Correspondence to N. I. Fedorova or I. Yu. Zykov.

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Translated by B. Gilbert

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Fedorova, N.I., Zykov, I.Y. Thermogravimetric Analysis of Carbon Sorbents Modified by Ammonium Bromide. Coke Chem. 66, 480–484 (2023). https://doi.org/10.3103/S1068364X23701107

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