以SiO2 纤维为宏观基体材料,首先采用化学气相沉积法制备纳米炭纤维,然后以纳米炭纤维作模板将纳米多孔Al2 O3 固化在SiO2 纤维上,以此得到Al2 O3-SiO2 纤维复合载体材料,最后采用浸渍法制得V2 O5-K2 SO4/Al2 O3-SiO2 纤维复合催化剂. 考察V2 O5-K2 SO4/Al2 O3-SiO2 纤维复合催化剂对炭黑颗粒氧化反应的催化性能. 结果表明,该类催化剂能明显降低炭黑颗粒的起燃温度,可以有效地降低柴油车尾气中炭黑颗粒的排放,具有潜在的实际应用前景.
An Al2O3-silica fiber support was prepared by first impregnating a Al(NO3)3 solution on a silica fiber mat on which sacrificial carbon nanofibers had been formed by chemical-vapor deposition, followed by burning in air. The support was further im-pregnated with a solution containing NH4 VO3 and K2 SO4 to prepare the Al2 O3-silica fiber supported V2 O5-K2 SO4 catalyst. The cata-lyst can greatly decrease the combustion temperature of soot by around 200 ℃, which is promising for decreasing soot emission in diesel-powered vehicles.
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