1987 Volume 13 Issue 6 Pages 818-824
Carbon deposition in a nickel pellet resulting from decomposition of carbon monoxide was studied by means of thermogravimetry in a range from 773 to 1073K. A nickel pellet reduced with hydrogen was used as catalyst. The highest rate of the initial reaction was observed at 773873K. The apparent orders of the average reaction rates of the initial period-of 10 min for concentration of carbon monoxide were 0.7 and 2 at 773K and 1073K, respectively.
A reaction model including the effect of gas diffusion within a pellet was proposed for the carbon deposition. In this model a rate expression derived from a Langmuir-Hinshelwood type mechanism was used. The calculated results agreed well with the experimental ones.
