非氧化性酸处理活性炭催化分解碘化氢的实验研究

INFLUENCE OF NON-OXIDATIVE ACID TREATMENT ON ACTIVATED CARBON FOR HYDROGEN IODIDE CATALYTIC DECOMPOSITION IN THE SULFUR-IODINE CYCLE FOR HYDROGEN PRODUCTION

将煤质活性炭应用于碘化氢(HI)催化分解,分别采用HCL和HF对其进行非氧化性酸处理改性,考察其HI分解活性,研究活性炭的物化性质与其催化活性关系。活性炭原样已是良好的HI分解催化剂,HI分解率随温度的上升而提高。经过非氧化性酸处理改性后,活性炭的催化活性明显提高。非氧化性酸处理可去除活性炭中绝大部分的碱金属、Al2O3及Si O2等杂质。活性炭表面含氧官能团含量变化不明显。HI分解率随碳含量的上升而提高。活性炭中微晶平面缺陷位和边缘碳原子可能是活性炭催化分解HI的活性位。

Coal based activated carbons with the treatment of non-oxidative acids were prepared for hydrogen iodide （HI） decomposition in the sulfur-iodine cycle for hydrogen production. The acid treated activated carbons and the original sample showed considerably improve in HI decomposition comparing with the blank yield. The activated carbon with the treatment of hydrochloride and hydrofluoric acids had the best catalytic activity. Most of the alkali metal, aluminum oxide, silica, and other inorganic matters were removed by the non-oxidative acids. The oxygen-containing groups changed little after the treatments of non-oxidative acids. HI conversion increased with carbon content of activated carbon. Activated carbon decomposing HI may be due to structural defects and edge sites.