Fe-modified Ni/Al2O3 catalysts were synthesized via the equal-volume impregnation method.The structure-activity relationship between the physicochemical properties and hydrogenation performance of the catalysts was investigated using characterization techniques such as XRD,SEM,NH3-TPD,and XPS.Furthermore,a study was conducted on the hydrogenation of styrene-butadiene-styrene block copolymer (SBS) to produce hydrogenated styrene-butadiene block copolymer (SEBS).The process conditions influencing SBS hydrogenation were optimized,and the hydrogenated products were analyzed by Fourier-transform infrared spectroscopy (FT-IR),thermogravimetry (TG),and differential scanning calorimetry (DSC).The results indicated that the introduction of Fe as a modifier to Ni/Al2O3 significantly reduced the hydrogenation depth of the aromatic segments in SBS.Under the optimized conditions—Fe loading of 5%,temperature of 150℃,pressure of 6 MPa,reaction time of 5 h,and stirring speed of 400 rpm—the hydrogenation degree of the butadiene segment exceeded 99%,while that of the aromatic segments remained below 2%.The catalyst maintained favorable catalytic activity after five cycles of reuse.The glass transition temperature of the hydrogenated SEBS product increased noticeably,and its operational stability was significantly enhanced.
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