Hydrogenation of styrene-isoprene-styrene block copolymer catalyzed by Ni/γ-Al2O3
Ni/γ-Al2O3 catalysts were prepared from deposition-precipitation of γ-Al2O3 and ammonium carbonate,then used in the catalytic hydrogenation of styrene-isoprene-styrene(SIS)block copolymers.Both the catalysts and products obtained were characterized by XRD,TEM,XPS,1HNMR and DSC.The effects of support type,theoretical loading amount of Ni(based on the mass of support,the same below)and reaction conditions on the hydrogenation of SIS were investigated.The results showed that Ni/γ-Al2O3 with 10%theoretical loading amount of Ni exhibited the best activity and selectivity,and the hydrogenation degree of polyisoprene reached 85%and that of benzene ring in the side reaction was less than 10%under the conditions of cyclohexane as solvent,reaction temperature 140℃,reaction pressure 1 MPa and reaction time 3.0 h.
NETL
NSTL
万方数据
