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±ÈÈçÎÄÏ×£ºThe O2-TPD experiments were performed on Quantachrome
ChemBET-3000. 200mg of the sample was pretreated using 4.16%
O2 in He (80 mL/min) at 600 ◦C for 30 min, and then cooled down to
room temperature in the same atmosphere. The oxygen desorbed
gradually from 100 ◦C to 850◦C at a heating rate of 10 ◦C/min in He
stream.
O2-TPD experiments were performed in a quartz reactor
using a TCD as detector. In each analysis, 500-mg samples
were pre-treated with helium gas increasing the temperature
from room temperature up to 973 K at 10 K min1. The
samples were oxidized with a 20% O2/He mixture at a total flow
rate of 30 ml min1 at 973 K for 30 min. Then, they were
cooled down to room temperature in the oxidizing mixture and
flushed by a stream of purified He for 30 min. The desorption
was carried out in the same conditions as the pre-treatment,
maintaining the temperature at 973 K until the TCD signal
returned to baseline.
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