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通过在Ce0.6Zr0.4O2载体上浸渍Pt(NO3)2制得Pt/Ce0.6Zr0.4O2催化剂,该催化剂在松散接触条件下,于NO + O2或O2气氛中均表现出比Pt/Al2O3更好的碳烟氧化性能.进一步研究表明,Pt/Ce0.6Zr0.4O2催化剂中的Pt与Ce0.6Zr0.4O2存在相互作用,使得催化剂在一定温度范围内对活性氧的利用率大为提高,从而促进了气氛中NO ? NO2的循环,乃至碳烟与NO2的反应和碳烟表面含氧中间物种的生成;更重要的是,这部分活性氧本身可加速含氧中间物种的分解.因此,在NO + O2的气氛中,Pt/Ce0.6Zr0.4O2催化剂的碳烟起燃温度比Pt/Al2O3降低了34 °C.
The Pt / Ce0.6Zr0.4O2 catalyst was prepared by impregnating Ce0.6Zr0.4O2 support with Pt (NO3) 2. The catalyst showed more stable performance than Pt / Al2O3 in NO + O2 or O2 atmosphere under loose contact conditions Good performance of soot oxidation.Further studies show that there is interaction between Pt and Ce0.6Zr0.4O2 in Pt / Ce0.6Zr0.4O2 catalyst, so that the utilization rate of active oxygen in the catalyst is greatly increased in a certain temperature range, thus Promote the NO 2 NO 2 circulation in the atmosphere, and even the reaction of soot with NO 2 and the formation of oxygen-containing intermediate species on the surface of soot. More importantly, this part of the active oxygen itself accelerates the decomposition of oxygen- In the atmosphere of NO + O2, the ignition temperature of soot of Pt / Ce0.6Zr0.4O2 catalyst decreased by 34 ° C compared to that of Pt / Al2O3.