Inhibiting the Carbon Deposition from the Reverse Boudouard Reaction in Refractories Submitted to CO–H2 Atmosphere
The catalytic effects of iron oxides and the structural evolution of carbon during the reverse Boudouard reaction in CO–H2 atmosphere is investigated at a nano and micro-scale. Sulphur compounds inhibit the carbon monoxide dissociation on contact with iron and iron oxides. The samples were characterised by X-ray diffraction, Raman spectroscopy, scanning and transmission electron microscopy. A mechanism that governs the inhibition of the reaction is proposed and validated at lab scale, in which the formation of a very thin protective FeS layer (0,5–1 nm) is involved. This research is applied to develop ew CO/H2 resistant refractories.