Fig. 4: In situ DRIFT spectra of the oxidation processes.
From: Bifunctional zeolites-silver catalyst enabled tandem oxidation of formaldehyde at low temperatures
a, b MF and c, d HCHO oxidation over Ag/SBA-15 component, respectively. b and d are the enlarged images of the shaded parts in a and c, respectively. After adsorption of MF or HCHO for 10 min, Ag/SBA-15 was purged with helium, and then switched to 20%O2–He for a temperature-programmed reaction.
