Influence of low CO concentration on catalysed carbon deposition on 20Cr25Ni steel in CO2 environments containing ethane

Abstract Carbon deposition on 20Cr25Ni steel at 700 °C has been investigated in CO 2 -based gases containing 0.7 vol%, 1.0 vol% and 1.4 vol% CO, each with ~1000vpm C 2 H 4 , at 700 °C. Filamentary carbon deposits were formed at the two lowest CO contents but not at 1.4 vol% CO. TEM analyses have shown that the different CO levels change the propensity for deposition by altering the ratio of Ni:Fe in the nanometre sized catalytic particles produced during oxidation.