活性炭负载磷钨酸催化聚酰胺6水解反应的研究

Study on hydrolysis of polyamide 6 over activated carbon supported phosphotungstic acid

以活性炭为载体,磷钨酸(HPW)为活性组分,通过浸渍法制备活性炭负载磷钨酸(HPW/C)催化剂,研究其对聚酰胺6(PA6)水解反应的影响。通过FT-IR、XRD、BET、GCMS和UV等对催化剂和水解产物进行表征分析。结果表明,当HPW负载量小于55%时,能均匀分散在活性炭的表面和孔隙;固相剩余物为未完全分解的PA6;液相产物的主要成分为己内酰胺(CPL);HPW/C催化PA6水解的优化条件为:HPW负载量为45%、催化剂质量分数为10%、反应温度为260℃、反应时间为1h,此时,PA6降解率和CPL产率可分别达83%与56%。

HPW/C,an activated carbon supported phosphotungstic acid catalyst,is prepared by impregnation method with activated carbon as support and phosphotungstic acid (HPW) as active component.Its effects on the hydrolysis reaction of polyamide 6 (PA6) are also studied.The catalyst and hydrolysis products are characterized by test methods like FT-IR,XRD,BET,GCMS and UV.It is shown that HPW disperses highly on the surface and in the pores of activated carbon when the loading amount of HPW is lower than 55%;the solid phase residue contains incompletely decomposed PA6 and the main component of the liquid phase product is ε-caprolactam (CPL).The optimum conditions of hydrolysis reaction are proved as follows:the loading amount of HPW is 45%,the dosage of the catalyst is 10%,the reaction temperature and time are 260℃ and 1 hour,respectively.Under optimum conditions,PA6 degradation rate and CPL yield can reach 83% and 56% respectively.