Thermal desorption of CO and H2 from degassed 304 and 347 stainless steel
Thermal desorption of CO and H2 from degassed 304 and 347 stainless steel
复制标题
脱气 304 和 347 不锈钢中 CO 和 H2 的热脱附
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
R. Outlaw
中科院分区：
文献类型：
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作者：
S. Rezaie;R. Outlaw
热脱附光谱（TDS），沿着俄歇电子能谱，用于研究仅暴露于残留气体的烘烤304和347不锈钢样品中H2和CO的脱附。347和304样品给出了相同的TDS光谱。CO的光谱包含一个中心在410-440 °C温度范围内的尖锐前导峰和一个指数增加的部分，温度高于500 °C，在600 °C附近出现一个小峰作为肩部。前导峰遵循二级解吸行为，活化能为28±2 kcal/mol，表明该峰的限速步骤很可能是在表面层中产生CO分子的表面反应。对应于该峰的脱附的CO的量为约0.5×1014分子/cm 2。CO光谱的指数上升部分似乎起源于体扩散过程。H2的TDS光谱由一个主峰组成，该主峰也集中在410-440 °C的温度范围内，其中两个峰位于410-440 °C的温度范围内。
Thermal desorption spectroscopy (TDS), along with Auger electron spectroscopy, was used to study the desorption of H2 and CO from baked 304 and 347 stainless‐steel samples exposed only to residual gases. Both 347 and 304 samples gave identical TDS spectra. The spectra for CO contained a sharp leading peak centered in the temperature range 410–440 °C and an exponentially increasing part for temperatures higher than 500 °C, with a small peak around 600 °C appearing as a shoulder. The leading peak followed a second‐order desorption behavior with an activation energy of 28±2 kcal/mol, suggesting that the rate‐limiting step for this peak is most likely a surface reaction that produces the CO molecules in the surface layer. The amount of desorbed CO corresponding to this peak was ∼0.5×1014 molecules/cm2. The exponentially rising part of the CO spectrum appeared to originate from a bulk diffusion process. The TDS spectrum for H2 consisted of a main peak centered also in the temperature range 410–440 °C, with two...