fig4
Figure 4. (A) CO2-TPD profiles; (B) NH3-TPD-MS profiles; and (C) O2-TPD-MS profiles. TPD: Temperature-programmed desorption; MS: mass spectrometry.
Figure 4. (A) CO2-TPD profiles; (B) NH3-TPD-MS profiles; and (C) O2-TPD-MS profiles. TPD: Temperature-programmed desorption; MS: mass spectrometry.
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