FT-IR spectroscopic investigation of the surface reaction of CH4 with NO x species adsorbed on Pd/WO3–ZrO2 catalyst

In-Situ FT-IR Spectroscopy Investigation of CH4 and CO2 Reaction

An exclusive trace of CH4 direct carboxylation with CO2 by a stepwise technology was investigated using in-situ FT-IR spectroscopy. The results showed that CH4 was dissociated to atomic hydrogen and M-CHx species on catalyst surface when it was first introduced in the system, then CO2 was inserted into the intermediate to direct carboxylate. Finally, the subsequent adsorption of CH4 provided active hydrogen for the species of previous surface reaction, thus leading to the formation of the product. It was also found that the first introduction of CO2 on the surface of the “clean” catalyst might likely react with surface H species, which had an irreversible effect on the catalytic activity of CH4.

Effect of a mixed precursor over monolith MnOx/La–Al2O3 catalyst for toluene oxidation

The MNMA catalyst prepared with a mixed precursor of Mn(NO₃)₂ and Mn(Ac)₂·4H₂O possesses more α-MnO₂ species and good dispersion and is more active for toluene oxidation.