氧在表面存在三种吸附态，其中原子态吸附氧是乙烯环氧化和深度氧化的活性物种，分子态氧对两个反应不起直接作用。
The adsorbed atomic oxygen is the common oxygen species for both ethylene epoxidation and combustion; molecular oxygen plays no direct role in either two reactions.
运用XPS分析方法研究一系列复合氧化物催化剂中毒前后硫在其表面的各种形态及催化剂活性组分中毒前后的组成、价态、化学机理及其变化。
By using XPS, before and after the intoxication of mixed oxide catalysts, the various appearance and the composition. valence and chemical mechanism of the active component of catalysts were studied.
吡啶-TPD 和XRD 表征结果证明，硫化温度和硫化还原工序，会改变催化剂表面酸性和硫化态活性物种在催化剂表面的聚集状态。
Pyridine-TPD and XRD results indicated that sulfiding temperature, sulfiding and reducing processes affected acidity and agglomerate state of activity species.
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