Preparation of nitrogen-doped activated carbon used for catalytic oxidation removal of H2S

被引:9
作者
Cheng, Shanjie [1 ]
Wang, Tao [1 ]
Chu, Liang [2 ]
Li, Jun [3 ]
Zhang, Liqiang [1 ]
机构
[1] Shandong Univ, Natl Engn Lab Reducing Emiss Coal Combust, Engn Res Ctr Environm Thermal Technol, Minist Educ,Shandong Key Lab Energy Carbon Reduct, Jinan 250061, Shandong, Peoples R China
[2] Huaneng Jiaxiang Power Generat Co Ltd, Jining, Peoples R China
[3] Shandong Univ, Sch Environm Sci & Engn, Qingdao 266237, Shandong, Peoples R China
基金
中国博士后科学基金;
关键词
Activated carbons; H2S removal; Nitrogen doping; Catalytic oxidation; HYDROGEN-SULFIDE; SURFACE-CHEMISTRY; HIGHLY EFFICIENT; PORE STRUCTURE; BIOGAS; CO2; PERFORMANCE; ADSORBENTS; ADSORPTION; SEPARATION;
D O I
10.1016/j.scitotenv.2024.170073
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In this study, nitrogen-doped modified activated carbons were synthesized for H2S removal from Zhuxi activated carbon and 4,4 '-bipyridine as raw material and nitrogen source, respectively. The synthesis strategy was hydrothermal treatment and subsequent NH3 annealing, and the formation and conversion patterns of the different N configurations were investigated. When the annealing temperatures were 500 degree celsius and 600 degree celsius, N-5 account for the majority. As the annealing temperature increased, the proportion of N-6 gradually increased. After the temperature increased to 1000 degree celsius, N-5 and N-6 were converted to N-Q to a certain degree, while the amount of nitrogen doping decreased significantly. The sample H160-0.2-800 exhibited excellent H2S removal with a high sulfur capacity of up to 206.89 mg/g, significantly higher than that of the original activated carbon ZX1200 (67.56 mg/g). The reason for this is that the micropores (Vmic = 0.5155 cm(3)/g) and specific surface area (SBET = 1369.5 m(2)/g) of the modified activated carbon are more developed than those of the original activated carbon. A high nitrogen content (3.14 wt%) and N-6 configuration proportion (73.56 %) are significant reasons for the excellent adsorption properties. The mechanism of the catalytic oxidation was investigated. The introduction of surface nitrogen-containing functional groups alkalizes the activated carbon surface, enhancing the adsorption and dissociation of H2S and O-2 and facilitating the formation of sulfur radicals and elemental sulfur.
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页数:13
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