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The measurement was determined by the pulse chemisorption technique using a conventional setup equipped with a temperature controlled setup and TCD detector. The sample (0.2 g) was reduced in flowing H2 (5 mL/min) at 500◦ C for 2 h, then purged in N2 at 550◦ C for 1 h to remove the hydrogen. The catalysts were saturated by hydrogen pulses at 30, 300, and 450◦ C. The pulse size was 5 mL of a 5% H2¨C95% N2 mixture and the time between pulses was 3 min.

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