4.2.8. H2-TPR-Hydrogen Temperature-Programmed Reduction

Hydrogen temperature-programmed reduction (H2-TPR) was carried out to determine the reducibility of catalytic species using the CHEMBET 3000 Quantachrome apparatus, Boynton Beach, Fl, USA. The sample (20 mg) was heated from room temperature up to 1073 K with 10 K/min heating rate, using a stream of 5% H2/Ar. The hydrogen consumption was estimated from the area of the recorded peaks.

The calibration of the TCD signal was performed by injecting a known quantity of hydrogen (typically 50 µL) in the carrier gas (Ar). The experimentally obtained peak surface (mV·s) was thus converted into micromoles of hydrogen.
