Thermogravimetric Analysis of Carbon Sorbents Modified by Ammonium Bromide

IF 0.4 Q4 ENGINEERING, CHEMICAL

Coke and Chemistry Pub Date : 2023-12-25 DOI:10.3103/S1068364X23701107

N. I. Fedorova, I. Yu. Zykov

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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 S_BET and total pore volume V_Σ 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 T_ig 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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溴化铵改性碳吸附剂的热重分析

研究了经溴化铵改性的碳吸附剂的热稳定性。当煤/KOH 的质量比为 1.0 时，以 D 煤为原料，在 800°C 下通过 1 小时的保温碱性活化制得吸附剂。这种吸附剂呈微孔状，具有很高的比表面（1340 m2/g）。通过使用不同浓度（1%、2% 和 4%）的溴化铵溶液浸泡，对吸附剂进行改性。这种改性改变了吸附剂的所有质地特征。比表面 SBET 和总孔隙体积 VΣ 都有所下降。热重分析确定了吸附剂样品氧化热解的温度极限：点火温度和完全燃烧温度。考虑到时间参数，计算出了点火指数和燃烧指数。结果发现，随着溴化铵溶液浓度的增加，样品的点火温度 Tig 和开始质量损失的温度 T1 也随之增加。此外，点火指数 D 和燃烧指数 S 也会增加。结果表明，用溴化铵对吸附剂进行改性可提高氧化热解的阈值。

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来源期刊

Coke and Chemistry ENGINEERING, CHEMICAL-

CiteScore

0.70

自引率

50.00%

发文量

期刊介绍： The journal publishes scientific developments and applications in the field of coal beneficiation and preparation for coking, coking processes, design of coking ovens and equipment, by-product recovery, automation of technological processes, ecology and economics. It also presents indispensable information on the scientific events devoted to thermal rectification, use of smokeless coal as an energy source, and manufacture of different liquid and solid chemical products.