【摘要】 利用化学沉淀法制备了纳米级Fe和纳米级Pd/Fe双金属催化剂 ,研究了它们对 2 ,4 二氯苯酚 (2 ,4 DCP)还原脱氯的催化性能 .结果表明 ,纳米级颗粒具有较高的比表面积和表面反应活性 ,其BET比表面积可达 12 4m2 /g ,当Pd/Fe用量为 6g/L时 ,2 ,4 DCP脱氯率达到 90 %以上 .脱氯效率与 pH值、温度、钯含量和Pd/Fe投加量等因素有关 .2 ,4 DCP在脱氯过程中先生成 2 氯苯酚和 4 氯苯酚 ,最终生成苯酚 ,而少量的 2 ,4 DCP可直接降解成苯酚 .更多还原

【Abstract】 Nanoscale Fe and nanoscale Pd/Fe bimetallic catalysts were prepared by chemical deposition and used to treat 2,4-dichlorophenol (2,4-DCP) in water. These nanoscale particles are characterized by high surface area to volume ratios and high reactivity. Their BET specific surface area reaches 12.4 m 2/g. Batch experiments demonstrate that the nanoscale Pd/Fe particles can effectively dechlorinate 2,4-DCP at a relatively low metal to solution ratio of 6 g/L. Dechlorination efficiency is 90% at a Pd to Fe mass ratio of 0.11%. Dechlorination is affected by the reaction temperature, pH, Pd/Fe ratio and amount of nanoscale Pd/Fe. 2-chlorophenol and 4-chlorophenol represent stable partially dechlorinated intermediates in the generation of phenol.更多还原