Reusable salt-template strategy for synthesis of porous nitrogen-rich carbon boosts H_(2)S selective oxidation  

作　　者：Xu Liu Liang Shan Xiaoxue Sun Tianxin Wang Zhongqing Liu Yuefeng Liu 

机构地区：[1]College of Chemical Engineering,Sichuan University,Chengdu,610065,China [2]Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,457 Zhongshan Road,Dalian,116023,China [3]College of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang,110142,China

出　　处：《Green Energy & Environment》2024年第12期1866-1877,共12页绿色能源与环境（英文版）

基　　金：financially supported by the National Key R&D Program of China(No.2022YFC3701900);National Natural Science Foundation of China(Nos.21606243);LiaoNing Revitalization Talents Program(XLYC1907053);Dalian National Laboratory for Clean Energy(DNL202021).

摘　　要：Removing hydrogen sulfide(H_(2)S)via the selective oxidation has been considered an effective way to further purify the indusial sulfurcontaining due to it can completely transform residual H_(2)S into elemental sulfur.While N-doped porous carbon was applied to H_(2)S 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 H_(2)S selective oxidation prepared using reusable NaCl as the template.The asprepared NC-10-800 catalyst exhibits excellent catalytic performance(sulfur formation rate of 784 g_(sulfur) kg_(cat.)^(-1) h^(-1)),outstanding stability(>100 h),and excellent anti-water vapor,anti-CO_(2) and anti-oxidation properties,suggesting significant potential for practical industrial application.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.

关 键 词：H_(2)S selective oxidation Nitrogen-doped carbon Reusable salt-template Green synthesis Porous carbon nanomaterials 

分 类 号：X701[环境科学与工程—环境工程] O643.36[理学—物理化学]