Pd/AC催化1,4-二氯苯加氢脱氯研究

Catalytic hydrodechlorination of 1,4-dichlorobenzene by Pd/AC catalyst

以活性炭(AC)为载体,采用浸渍法制备Pd/AC催化剂,并利用XRD,BET,SEM,TEM等表征手段对AC和Pd/AC进行表征,结果表明,活性组分Pd在活性炭上分散均匀。研究了Pd/AC为催化剂,常压下对1,4-二氯苯(1,4-DCB)进行催化加氢脱氯。在以甲醇为溶剂,2 m L,12.5 g/L 1,4-二氯苯-甲醇溶液为反应原料,Pd/AC催化剂用量为100 mg,反应温度35℃,反应时间为4 h和常压氢气条件下,1,4-DCB的去除率达到100%,苯收率为100%。Pd/AC催化剂套用5次后活性下降,主要原因为有机物沉积和活性组分Pd团聚。

Using activated carbon as the support, the Pd/AC catalyst was prepared by impregnation method. The AC and Pd/AC were characterized by XRD, BET, SEM and TEM. The results show that the active component Pd nanoparticles were well dispersed on AC. The Pd/AC catalyst was used for the catalytic hydrodechlorination of 1,4- DCB at ambient pressure. The results also show that both of 1,4-DCB removal rate and the benzene yield can reach 100% under the condition as follows： 12.5 g/L 1,4-DCB-methanol solution, catalyst dosage of 100 mg, reaction temperature 35℃, H2 atmosphere and reaction for 4 h. After reusing 5 times, the activity of Pd/AC was reduced. The main reason was the deposition of the organics on the catalyst surface and the agglomerations of the active component Pd.