Mass gain during carburization

Figure 1. Mass gain during carburization of catalyst B-6 in H2/CO (3/1) at 1 atm. Asterisk ( ) indicates time at which thermomagnetic analysis was made.

Table IV. Activation Energy and Preexponential Factor for Mass Gain during Isothermal Carburization of Catalysts B-2 and B-6...

The effect of heating rate during carburization (H2/CO = 3/1) on the magnetic properties of the catalysts were studied at 1 atm in the magnetic susceptibility apparatus and in the tubular reactor (Table VII). The mass gain of the samples carburized at 1 atm in the susceptibility... 

Carburization Kinetics. The trends in the mass increase during carburization of reduced B-2 and B-6 catalysts (Figure 1) are qualitatively similar to those reported (1,6,13). The rapid initial mass gain, presumably attributable to carbide formation, is followed by a lower, constant rate of increase that is attributed to free carbon (6). The formation of the free carbon, which has been associated with catalyst swelling, occurred only on exposure to H2/CO mixtures but not CO alone and when the Fe2C (Hagg) phase predominated. 

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See also in sourсe #XX -- [ , ]

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