钯/泡沫镍对水体中4-氯酚的氢解脱氯研究

采用置换沉积法制备泡沫镍负载钯(Pd/Ni)催化剂,研究了其在H2作为供氢体时对水相中4-氯酚(4-CP)的催化氢解脱氯作用.考察了Pd负载量、H2流量和反应液pH值对4-CP转化率的影响.结果表明,在相对较低的Pd负载量和H2流量下即可实现4-CP的快速高效去除,且反应液pH值在3.04~10.97的范围对反应影响不显著.当Pd负载量为0.1%、H2流量为10mL/min、pH值为6.80时,反应1h,4-CP转化率达92.6%.Pd/Ni具有较高的稳定性,重复实验表明,该催化剂使用3次后,催化活性仅下降了2.0%.

Catalytic hydrodechlorination of 4-chlorophenol in aqueous solution by a palladized foam nickel catalyst

Palladized foam nickel (Pd/Ni) catalyst was synthesized by replacement deposition and used in the hydrodechlorination of 4-chlorophenol (4-CP) in aqueous solution. Hydrogen gas was supplied as hydrogen donor in the dechlorination process. High removal efficiency was obtained under ambient temperature. Major factors that influence the conversion rate, including Pd loading amount, hydrogen flow rate, and pH were investigated. 4-CP was effectively transformed with relatively low Pd loading amount and hydrogen supply, and pH had little effect on the dechlorination efficiency in the range of 3.04~10.97. Under the optimal operational conditions (Pd loading amount 0.1 wt%, hydrogen flow rate 10 mL/min, and pH 6.80), 4-CP was converted up to 92.6% within 1 h. The Pd/Ni catalyst was stable, with a reduction in catalytic activity of 2.0% after three recycles.