Abstract
The kinetics of filamentous carbon formation on promoted (Mg, Ca) and unpromoted Ni/α-Al 2 O 3 was studied in an oscillating microbalance reactor at a methane partial pressure of 130 kPa, hydrogen partial pressures from 0 to 150 kPa, and temperatures from 773 to 923 K. The presence of hydrogen and promoters influenced the induction and autoacceleration periods significantly. The apparent activation energy changed gradually from a negative to a positive pseudo constant value with carbon formation, and the change in apparent activation energy showed a strong hydrogen dependence. The rate-determining step during the filamentous carbon formation seems to change with carbon deposition. Possible causes are discussed based on the mechanism of filamentous carbon formation.
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