Inhibition of fire suppressants on the CO removal over ceria-supported transition metal catalysts

IF 3.3 3区工程技术 Q2 ENGINEERING, CIVIL

Fire Safety Journal Pub Date : 2025-06-22 DOI:10.1016/j.firesaf.2025.104461

Ning Kang, Zhiqiang Zhao, Xiaoyang Yu, Qian Li, Jin Lin, Shouxiang Lu

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引用次数: 0

Abstract

The CO elimination from fire smoke containing fire suppressants through transition metal oxides supported by ceria catalysts (M/Ce) faces new challenges. The effects of two typical fire suppressants (CF₃Br and NaHCO₃) on the conversion of CO and the evolution of intermediate species on three M/Ce catalysts (M = Cu, Co and Mn) were investigated. The impact mechanism of the fire suppressants was further revealed via in situ DRIFTS experiments for Cu/Ce catalyst in the absence and presence of fire suppressants. The results show that the activity and reusability of Cu/Ce and Co/Ce are decreased by the CF₃Br pretreatment but Mn/Ce exhibits a certain resistance. For the effect of NaHCO₃, the pyrolysis gases play a dominant role and its degree depends on the reaction temperature and the CO adsorption and activation capacity of catalysts. Moreover, in situ DRIFTS results reveal that the blocked reaction of adsorbed CO intermediates and oxygen species and the more severe masking of carbonates on the catalyst surface could be responsible for the decrease of the CO elimination performance due to the typical fire suppressants. This work can provide valuable insights for understanding the inhibition mechanism of fire suppression on CO elimination and exploring the resistance strategies to guarantee emergency rescue.

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灭火剂对铈负载过渡金属催化剂CO脱除的抑制作用

铈催化剂负载过渡金属氧化物（M/Ce）去除含灭火剂火灾烟气中的CO面临新的挑战。研究了两种典型的灭火剂（CF3Br和NaHCO3）在3种M/Ce催化剂（M = Cu， CO和Mn）上对CO转化和中间产物演化的影响。通过对Cu/Ce催化剂的原位DRIFTS实验，进一步揭示了灭火剂在无灭火剂和有灭火剂情况下的影响机理。结果表明，CF3Br预处理降低了Cu/Ce和Co/Ce的活性和可重复使用性，但Mn/Ce表现出一定的抗性。对于NaHCO3的作用，热解气体起主导作用，其作用程度取决于反应温度和催化剂对CO的吸附活化能力。此外，原位DRIFTS结果表明，典型灭火剂对CO消除性能的降低可能是由于吸附CO中间体和氧的反应受阻以及碳酸盐在催化剂表面更严重的遮蔽作用。本研究为了解火灾灭火对CO消除的抑制机制，探索抵抗策略，保障应急救援提供了有价值的见解。

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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来源期刊

Fire Safety Journal 工程技术-材料科学：综合

CiteScore

5.70

自引率

9.70%

发文量

153

审稿时长

60 days

期刊介绍： Fire Safety Journal is the leading publication dealing with all aspects of fire safety engineering. Its scope is purposefully wide, as it is deemed important to encourage papers from all sources within this multidisciplinary subject, thus providing a forum for its further development as a distinct engineering discipline. This is an essential step towards gaining a status equal to that enjoyed by the other engineering disciplines.