The influence of the surface characteristics of corn-straw biochar catalyst for the simultaneous removal of HCN, COS, and CS₂ was studied. The results showed that the corn-straw biochar catalyst activated by CO₂ exhibited excellent catalytic performance for HCN, COS, and CS₂ conversion. The results of CO₂–TPD, EPR, TG/DTA, BET, XRD, Raman, and DRIFTS showed that various preparation conditions had a great influence on the surface characteristics. The microporous structure, amorphous structure, basic sites, oxygen vacancies, and surface functional groups played crucial roles in the simultaneous removal process. The carbonization temperature could affect the pore structure and the amorphous structure, and the activating agents affected the basic sites and the oxygen vacancies on the surface. The activation temperature and the flow rate of the activated gas could change the reaction speed, thereby affecting the catalytic efficiency. Furthermore, DRIFTS measurements were carried out to investigate the reaction mechanism. H₂O molecules could be converted into hydroxyl groups, which promoted the hydrolysis reaction. HCN was hydrolyzed into CO and NH₄⁺, and CS₂ and COS were hydrolyzed into CO₂ and H₂S, respectively. Finally, H₂S and NH₄⁺ were oxidized to S-O and NO⁺, respectively.

中文翻译：

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同时去除HCN，COS和CS2的玉米秸秆生物炭催化剂的表面表征研究

研究了玉米秸秆生物炭催化剂表面特性对同时去除HCN，COS和CS _2的影响。结果表明，CO ₂活化的玉米秸秆生物炭催化剂对HCN，COS和CS _2的转化表现出优异的催化性能。CO ₂的结果–TPD，EPR，TG / DTA，BET，XRD，Raman和DRIFTS表明，各种制备条件对表面特性有很大的影响。微孔结构，无定形结构，碱性位，氧空位和表面官能团在同时去除过程中起关键作用。碳化温度会影响孔结构和非晶结构，而活化剂会影响表面的碱性位点和氧空位。活化温度和活化气体的流速会改变反应速度，从而影响催化效率。此外，进行了DRIFTS测量以研究反应机理。高₂O分子可以转化为羟基，从而促进水解反应。HCN水解成CO和NH ₄ ⁺，和CS ₂和COS被水解成CO ₂和H ₂分别S，。最后，将H ₂ S和NH ₄ ⁺分别氧化为SO和NO ⁺。