التفاصيل البيبلوغرافية
| العنوان: |
Nitrogen-doping boosted the activity of K/Al2O3 catalysts in simultaneous removal of COS and CS2: An experimental and theoretical study. |
| المؤلفون: |
Wu, Peng, Ding, Shipeng, Wang, Bingran, Shen, Kai, Zhang, Shule, Zhang, Yaping |
| المصدر: |
Journal of Environmental Chemical Engineering; Apr2024, Vol. 12 Issue 2, pN.PAG-N.PAG, 1p |
| مصطلحات موضوعية: |
ALUMINUM oxide, NITROGEN, ACTIVATION energy, CATALYSTS, GAS furnaces, SCISSION (Chemistry) |
| مستخلص: |
The simultaneous catalytic purification of COS and CS 2 in blast furnace gas usually suffers from poor removal activity, and a molecular understanding of the reaction mechanism over typical Al-based catalysts is still missing. Herein, we reported that N-doping was an effective strategy to enhance the activity of K 0.1 Al 2 O 3. The optimal N-doped K 0.1 Al 2 O 3 achieved more than 95% COS and CS 2 conversion, with 80% H 2 S selectivity at 150 °C. It was revealed that N-modification promoted the formation of N-Al, oxygen vacancies and OH- species, and induced stronger basic sites. Besides, the N-doping enhanced COS and CS 2 adsorption, and facilitated the formation of reactive intermediate species. The adsorbed CS 2 combines with H to produce CS 2 H-, which further reacts with H- or OH- and triggers the cleavage of the C-S bond to produce H 2 S and COS. The introduction of N changes the process of C-S bond cleavage and reduces the reaction energy barrier. • N-doping strategy was applied to enhance the activity of K 0.1 Al 2 O 3 catalysts. • The preferred catalyst exhibits significantly enhanced simultaneous removal of COS and CS 2. • The reaction pathways on the surfaces of catalysts were proposed at the molecular level. • The introduction of N alters the process of C-S bond cleavage with lower energy barrier. [ABSTRACT FROM AUTHOR] |
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