The correlation between the iodine value of coconut shell carbon and their reaction performance for NO2 to NO

Shifang Mu, Hongliang Wang, Yan Wang, Junchao Gu, Yujing Weng, Qi Sun, Yulong Zhang
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Abstract

The precise detection of NO2 requires the conversion of NO2 to NO using a molybdenum conversion furnace. Currently, molybdenum wire is utilized as the conversion agent for the molybdenum furnace; however, the high operating temperature of the molybdenum wire can inadvertently convert NH3 in industrial exhaust gas to NO, potentially impacting the accuracy of the detection process. Consequently, there is a pressing need to develop low‐temperature conversion agents. The study aims to establish a correlation between the iodine value, which characterizes the liquid‐phase adsorption properties of activated carbon, and its capacity for NO2 conversion, with the potential to provide valuable theoretical insights supporting the development of commercial molybdenum furnace conversion agents.The iodine value of coconut shell carbon is closely related to their reaction performance for NO2 to NO among three samples with different iodine values. AC‐900, AC‐1200, and AC‐1500 exhibit notable NO2 to NO conversion capabilities. Specifically, AC‐900 demonstrates significantly superior reaction performance compared to AC‐1200 and AC‐1500. Under conditions of 175 °C and 1 L/min, the NO2 conversion rates for AC‐900, AC‐1200, and AC‐1500 are measured at 97.3%, 88.2%, and 86.4%, respectively. Furthermore, the evaluation of AC‐1200 and AC‐1500 at different flow rates at 125 °C reveals a decrease in NO2 conversion with increasing gas flow rate. AC‐1200 exhibits better reaction performance compared to AC‐1500.The structure‐activity relationship between iodine value of coconut shell carbon and their performance for NO2 to NO is revealed. The capacity of activated carbon to convert NO2 is significantly influenced by the presence of oxygen functional groups and the proportion of micropores. The content of micropores and oxygen‐containing functional groups, especially phenolic hydroxyl groups, decreases with the increase of iodine value, leading to a decrease in the reaction performance of the conversion agent.This article is protected by copyright. All rights reserved.
椰壳碳的碘值与其将二氧化氮转化为氮氧化物的反应性能之间的相关性
要精确检测 NO2,就必须使用钼转化炉将 NO2 转化为 NO。目前,钼丝被用作钼炉的转化剂;但是,钼丝的工作温度较高,可能会无意中将工业废气中的 NH3 转化为 NO,从而影响检测过程的准确性。因此,迫切需要开发低温转化剂。本研究旨在建立表征活性炭液相吸附特性的碘值与其 NO2 转化能力之间的相关性,以期为商用钼炉转化剂的开发提供有价值的理论依据。在三种不同碘值的样品中,椰壳炭的碘值与其将 NO2 转化为 NO 的反应性能密切相关。AC-900、AC-1200 和 AC-1500 具有显著的将 NO2 转化为 NO 的能力。具体来说,AC-900 的反应性能明显优于 AC-1200 和 AC-1500。在 175 °C 和 1 L/min 的条件下,AC-900、AC-1200 和 AC-1500 的二氧化氮转化率分别为 97.3%、88.2% 和 86.4%。此外,在 125 °C、不同流速下对 AC-1200 和 AC-1500 进行的评估显示,随着气体流速的增加,NO2 转化率有所下降。椰壳炭的碘值与其将 NO2 转化为 NO 的性能之间的结构-活性关系得到了揭示。活性炭转化 NO2 的能力受氧官能团的存在和微孔比例的显著影响。微孔和含氧官能团,尤其是酚羟基的含量随着碘值的增加而减少,导致转化剂的反应性能下降。本文受版权保护。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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