做负载贵金属催化剂，看了点文献都说先在氢气中还原若干小时，然后就是passivated几个小时，不知道这个方法是怎么操作的，具体目的是什么？
文献一：……reduced in H2-N2 flow at 450℃ for 4h,and finally passivated in a flowing of CO2-N2 gas for 12h and stored.（载体 是SiO2)
文献二：the samples with different Ru content were reduced in an H2 ?ow at 450 ?C for 8 h, followed by cooling to room temperature in hydrogen and then passivation.(载体是GNF）
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