After reduction by hydrogen, the monolayer dispersed PtO_2 forms Pt particles smaller than that from PrO_2 phase. When supported Pt particles are oxidized to form PRO_2, it will disperse onto the support as monolayer again.

• 单层分散在载体上的PtO_2能被H_2还原为分散度很高的金属Pt,当它经使用老化后又能再经氧化转变成PtO_2,这种新生的PtO_2能够再度自发单层分散在载体上。