热处理温度对粘胶基活性碳纤维结构及催化脱硫性能的影响

doi:10.19964/j.issn.1006-4990.2025-0145

Abstract

Abstract:

Under the “dual-carbon” background，the dominant position of traditional limestone-gypsum flue gas desulfurization（FGD） technology faces significant challenges.Carbon-based desulfurization，which catalytically oxidizes SO₂ into sulfuric acid for sulfur resource recovery，represents a promising new desulfurization technology.By investigating the structural evolution of viscose-based activated carbon fiber（ACF） before and after high-temperature heat treatment，focusing on physical and surface chemical structure changes，the effect of these modifications on SO₂ catalytic oxidation performance was explored.Under simulated high-concentration flue gas conditions（0.2% SO₂，10% O₂，20% H₂O） at 80 ℃ with a volume space velocity of 600 h⁻¹，untreated ACF-O exhibited a breakthrough sulfur capacity of merely 21 mg/g ACF.After 1 hour heat treatment at 1 000 ℃，this capacity was increased to 153 mg/g ACF-more than 7 times that of ACF-O.The results demonstrated that 1 000 ℃ heat treatment facilitated the decomposition of acidic oxygen-containing functional groups and the conversion of nitrogen-containing groups into graphitic nitrogen on ACF surfaces.These structural modifications enhanced the heat-treated ACF's surface alkalinity，increased edge defects，improved electron transfer capability，and expanded specific surface area.Consequently，these improvements promoted the adsorption，activation，and catalytic oxidation of SO₂ and O₂，ultimately forming sulfuric acid in humid flue gas systems.

Key words: nonmetallic catalysis, flue gas desulfurization, SO?, ACF

CLC Number:

TQ127.1

MA Tianli, LI Mingsong, LÜ Li, TANG Shengwei, ZHANG Tao, TANG Wenxiang. Effect of heat treatment temperature on structure of viscose-based activated carbon fibers and their catalytic desulfurization performance[J]. Inorganic Chemicals Industry, 2026, 58(3): 112-118.

Figures/Tables 12

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References 27

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E/eV	含氧官能团	相对含量/%
E/eV	含氧官能团	ACF-O	ACF-500	ACF-800	ACF-1000
530.0	无机氧	4.8	4.7	4.7	2.9
531.4	C=O	21.1	16.7	8.7	3.0
532.8	C—O	42.0	52.7	71.2	84.6
534.5	—COO—	26.7	21.5	10.9	2.3
536.3	CO₂/O₂	5.8	4.5	3.2	7.2

E/eV	含氮官能团	相对含量/%
E/eV	含氮官能团	ACF-O	ACF-500	ACF-800	ACF-1000
398.4	N-6	20.9	26.3	25.1	21.1
400.1	N-5	39.7	33.5	27.2	27.5
401.5	N-4	27.0	29.9	34.4	40.9
403.3	N—O	14.4	12.3	13.0	11.1

ACF材料	比表面积/ （m²·g^-1）	微孔体积/ （cm³·g^-1）	比孔容/ （cm³·g^-1）
ACF-O	1 417	0.57	0.62
ACF-500	1 460	0.58	0.63
ACF-800	1 477	0.63	0.68
ACF-1000	1 689	0.75	0.83

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Effect of heat treatment temperature on structure of viscose-based activated carbon fibers and their catalytic desulfurization performance

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