描述我测了TPD
Temperature programmed desorption of oxygen (O2-TPD) was carried out in a conventional apparatus equipped with TCD.
O2-TPD experiments were performed in a quartz reactor using a TCD as detector.
描述预处理
The samples (0.25 g) were first treated at 850 °C for 1 h in oxygen and cooled to room temperature in the same atmosphere, then swept with helium at a rate of 35 mL/min until the base line on the recorder remained unchanged.
In each analysis, 500 mg samples were pre-treated with helium gas increasing the temperature from ambient temperature up to 700 °C at 10 °C min−1.
The samples were oxidised with a 20% O2/He mixture at a total flow rate of 30 ml min−1 at 700 °C for 30 min.
描述吹去物理吸附
Then, they were cooled down to ambient temperature in the oxidising mixture and flushed by a stream of purified He for 30 min.
描绘怎么出图
Finally, the sample was heated at a rate of 35 °C/min in helium to record the TPD spectra.
The desorption was carried out in the same conditions as the pre-treatment, maintaining the temperature at 700 °C until the baseline of the chromatograph was stabilised.
参考
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