使用浸渍法制备了一系列SiO2含量不同的改性Al2O3材料,并以此为载体制得一系列Pt/SiO2-Al2O3柴油车尾气净化氧化催化剂(DOC).N2吸附-脱附实验和扫描电子显微镜(SEM)检测证实,SiO2以多孔形式均匀覆盖在Al2O3表面,没有明显影响Al2O3的织构性质.运用热重法对各催化剂的抗硫性进行了表征,结果证实,SiO2的引入有效提高了Pt/Al2O3催化剂的抗硫性;经硫累积实验后,所制备的Pt/SiO2-Al2O3系列催化剂硫酸盐累积量均小于1.0 wt.％,而Pt/Al2O3的硫酸盐累积量约为3.94 wt.％.催化剂活性检测结果表明,适量SiO2的引入不会影响Pt/Al2O3催化剂的活性;当SiO2引入量为18 wt.％时,Pt/SiO2(18％)-Al2O3催化剂不仅抗硫性能优异而且具有更好的耐久性,模拟柴油车使用160000 km后,其催化活性未明显降低.因此,本研究认为SiO2在Pt/Al2O3DOC催化体系中,可以起着抑制硫中毒及提高耐久性的作用.
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