Ni/γ-Al2O3催化苯乙烯-异戊二烯-苯乙烯嵌段共聚物加氢研究

Hydrogenation of styrene-isoprene-styrene block copolymer catalyzed by Ni/γ- Al2O3

摘要:

以硝酸镍、γ-Al₂O₃、碳酸铵为原料,采用沉积沉淀法制备 Ni/γ-Al₂O₃催化剂,并将其应用于苯乙烯-异戊二烯-苯乙烯嵌段共聚物(SIS)催化加氢。通过XRD、TEM、XPS、₁^HNMR和DSC对催化剂和产物进行了表征。从载体类型、负载量、反应条件以及循环次数等方面对SIS加氢性能进行考察,结果表明：以环己烷为溶剂,反应温度为140 ℃,反应压力为1 MPa的条件下,催化剂展现出最优活性。聚异戊二烯的嵌段加氢度达到85%,副反应苯环的加氢度小于10%。

Abstract:

With nickel nitrate γ-Al₂O₃ and ammonium carbonate, precipition of Ni/γ-Al₂O₃ by Deposition and Precipitation Method was applied to the catalytic hydrogenation of styrene-isoprene-styrene block copolymer (SIS). The catalysts and products were characterized by XRD, TEM, XPS, ^₁HNMR and DSC. The hydrogenation performance of SIS was investigated from the aspects of support type, load, reaction conditions and cycle times. The results showed that the catalyst showed the best activity when cyclohexane was used as solvent, reaction temperature was 140 ℃, and reaction pressure was 1 MPa. The block hydrogenation degree of polyisoprene reaches 85%, and the hydrogenation degree of the side reaction benzene ring is less than 10%.