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<p>A suite of Mn-doped activated carbons was synthesized via an ultrasound-assisted incipient wetness method, employing varied manganese precursors, loading ratios, and calcination temperatures. These activated carbons underwent comprehensive characterization via N<sub>2</sub> adsorption/desorption analysis, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Desulfurization activity was assessed within a fixed-bed reactor under simulated flue gas conditions. Results indicated Mn(NO<sub>3</sub>)<sub>2</sub> as the superior precursor, with optimal performance observed at a 10&#xa0;wt% loading ratio and an 800&#xa0;°C calcination temperature. The resultant catalyst exhibited a sulfur capacity of 234&#xa0;mg/g at a reaction temperature of 80&#xa0;°C. Prior to desulfurization, MnO and Mn<sub>3</sub>O<sub>4</sub> coexisted on the activated carbon surface; post-desulfurization, MnSO<sub>4</sub> and MnS were detected, suggesting the involvement of Mn species in the desulfurization reaction, which likely contributes to the deactivation of the Mn-doped activated carbon. Furthermore, adsorption isotherms, adsorption kinetics, and reaction kinetics were analyzed using appropriate models to elucidate the desulfurization behavior of the catalysts.</p>

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Effect of precursors, doping amount and calcination temperature on desulfurization performance of manganese supported on activated carbon

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Mengjin Xu,
  • Yaling Chen,
  • Jianjun Li

摘要

A suite of Mn-doped activated carbons was synthesized via an ultrasound-assisted incipient wetness method, employing varied manganese precursors, loading ratios, and calcination temperatures. These activated carbons underwent comprehensive characterization via N2 adsorption/desorption analysis, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Desulfurization activity was assessed within a fixed-bed reactor under simulated flue gas conditions. Results indicated Mn(NO3)2 as the superior precursor, with optimal performance observed at a 10 wt% loading ratio and an 800 °C calcination temperature. The resultant catalyst exhibited a sulfur capacity of 234 mg/g at a reaction temperature of 80 °C. Prior to desulfurization, MnO and Mn3O4 coexisted on the activated carbon surface; post-desulfurization, MnSO4 and MnS were detected, suggesting the involvement of Mn species in the desulfurization reaction, which likely contributes to the deactivation of the Mn-doped activated carbon. Furthermore, adsorption isotherms, adsorption kinetics, and reaction kinetics were analyzed using appropriate models to elucidate the desulfurization behavior of the catalysts.