Fig. 4: Mechanism studying by in situ DRIFT spectroscopy.
From: CO-tolerant RuNi/TiO2 catalyst for the storage and purification of crude hydrogen
a Diagram of the operations including the pre-reduction and switching details, where α-1, α-2, β-1, and β-2 present the spectra collected in different conditions. α-1 was recorded after CO (CO:Ar = 5:95, v/v) adsorption and Ar sweeping; then followed α-2 recorded for toluene (toluene: Ar = 3:97, v/v) adsorption after CO treatment. After refilling the catalyst, the same process was carried out except toluene adsorption (β-1) was recorded before CO adsorption (β-2). Toluene-CO switching DRIFTS were carried out over c 2Ru/TiO2, b 2Ru5Ni/TiO2 (the regions of 2300–1800 cm−1 were reduced by 2 times for (c) and 5 times for (c), respectively), and d 5Ni/TiO2. Only the regions of wavenumber at 3200–2800 cm−1 and 2300–1800 cm−1 were shown in the pictures. The velocity of all the carrier gases used in the experiments was 30 mL/min. e The mechanism model of RuNi/TiO2 in CO-tolerant toluene hydrogenation reaction.
