Sintering nonisothermal

Thus our first conclusion if the harmful effects of thermal shock, or sintering of the catalyst surface, or drop in selectivity, do not occur with hot particles, then we would encourage nonisothermal behavior in exothermic reactions. On the other hand, we would like to depress such behavior for endothermic reactions. 

Figure 10.21 Design and analysis procedures for adiabatic, nonisothermal plug-flow reactors affected by diffusion, chemical deactivation, and sintering. (Reprinted from Lee and Ruckenstein 1983, by courtesy of Marcel Dekker, Inc.)...

Densification Kinetics During Nonisothermal Sintering of Oxides ... 

Undoubtedly, dislocation motion would continue under isothermal conditions, but it would be diffusion controlled. It seems likely that as sintering continues, the ratio of dislocation transport to diffusion transport would decline however, studies of the type reported here give information only on the initial or nonisothermal stage of densification. 

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