首页|Reusable salt-template strategy for synthesis of porous nitrogen-rich carbon boosts H2S selective oxidation
Reusable salt-template strategy for synthesis of porous nitrogen-rich carbon boosts H2S selective oxidation
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Removing hydrogen sulfide(H2S)via the selective oxidation has been considered an effective way to further purify the indusial sulfur-containing due to it can completely transform residual H2S into elemental sulfur.While N-doped porous carbon was applied to H2S selective oxidation,a sustainable methodology for the synthesis of efficient and stable N-doped carbon catalysts remains a difficulty,limiting its future development in large-scale applications.Herein,we present porous,honeycomb-like N-doped carbon catalysts with large specific surface areas,high pyridinic N content,and numerous structural defects for H2S selective oxidation prepared using reusable NaCl as the template.The as-prepared NC-10-800 catalyst exhibits excellent catalytic performance(sulfur formation rate of 784 gsulfur kg-1cat.h-1),outstanding stability(＞100 h),and excellent anti-water vapor,anti-CO2 and anti-oxidation properties,suggesting significant potential for practical industrial appli-cation.The characterization results and kinetic study demonstrate that the large surface areas and structural defects created by the molten salt at high temperature enhance the exposure of pyridinic N sites and thus accelerate the catalytic activity.Importantly,the water-soluble NaCl template could be easily washed from the carbon nanomaterials,and thus the downstream salt-containing wastewater could be subsequently reused for the dissolution of carbon precursors.This environment-friendly,low-cost,reusable salt-template strategy has significant implications for the development of N-doped carbon catalysts for practical applications.
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