担载CuO基催化剂上2,4-二氯酚的有效氧化降解

Efficient Oxidative Degradation of 2,4-Dichlorophenol over Supported CuO-Based Catalysts

研究了2,4-二氯酚的催化氧化降解.结果表明,CuO/γ-Al2O3催化剂表现出较高的活性,且碱土金属氧化物助剂的添加可进一步显著提高2,4-二氯酚氯离子的释放率,其中以SrO的促进作用最强,该催化剂循环使用3次,2,4-二氯酚转化率及氯离子的释放率均维持100%.X射线衍射和NH3程序升温脱附结果表明,催化剂上CuO粒子分散度高并且酸中心数少有利于2,4-二氯酚的氧化降解.提出了2,4-二氯酚催化氧化降解可能的反应途径.

The catalytic oxidative degradation of 2,4-dichlorophenol（2,4-DCP）was studied.The results indicated that CuO/γ-Al2O3 exhib-ited high activity for the reaction.Adding alkaline-earth metal oxides into CuO/γ-Al2O3 improved the liberation rate of chloride ion from 2,4-DCP remarkably and SrO was the most efficient.The 2,4-DCP conversion and the liberation rate of chloride ion reached 100% when the CuO/γ-Al2O3-SrO catalyst was used 3 times.The results of X-ray diffraction and the temperature-programmed-desorption of ammonia indi-cated that the catalyst with good dispersion of CuO particles and a less amount of acid sites was favorable for the efficient oxidative degrada-tion of 2,4-DCP.A probable pathway of the oxidative degradation for 2,4-DCP over the copper-based catalyst was suggested.