亚铜基离子液体催化氧化净化PH_3

Catalytic oxidation of phosphine with Cu^+-based ionic liquid

以自主筛选的亚铜基离子液体为催化剂及反应介质,对含PH3的混合气进行液相催化氧化净化研究。采用FT-IR对单体[bmim]Cl进行构象分析,测定亚铜基离子液体的热分解温度,考察混合气中温度、O2浓度、[bmin]Cl与CuCl摩尔比对磷化氢净化效率的影响,探讨离子液体催化氧化净化PH3的可能机理。研究结果表明:合成的选择性好、稳定性高的亚铜基离子液体催化剂对PH3的净化效率长时间保持在100%。较适宜的反应温度为60℃;随着混合气中O2含量的增加,吸收液对PH3的净化效率有所提高,在氧含量为7.8%时净化效果最好;亚铜基离子液体催化体系对PH3氧化有很好的催化作用,[bmim]Cl与CuCl最佳摩尔比为1:3。失活的催化剂经鼓氧再生后,效率依然长时间保持在97%,再生恢复性能较好。

Cu＋-based ionic liquid was used as a self-screened catalyst and reaction medium of liquid phase catalytic oxidation to purify phosphine（PH3）.FT-IR was chosen for the conformational analysis of the catalyst.The influences of temperature,oxygen content,and molar ratio of[bmim]Cl to CuCl on the purification efficiency of PH3 were explored. The possible mechanism of catalytic oxidation with Cu＋-based ionic liquid was also proposed.The results illustrate that using the catalyst of target ionic liquid with excellent selectivity and high stability,the purification efficiency of PH3 can keep at 100%in Cu＋-based ionic liquid catalytic system.The optimum reaction temperature is 60℃.As the O2 content increases,the catalyst plays a positive role on the catalytic oxidation process of PH3 and the optimum O2 content is 7.8%. The optimum molar ratio of[bmim]Cl to CuCl is 1：3.Regenerating the inactive catalyst solution,the purification efficiency of PH3 can still keep at 97%for a long time,indicating that the catalyst has good regeneration and recovery potential.