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An all-glass (or quartz) internal recycle reactor, designed to eliminate problems of metal-containing reactors, is described. Reactant adsorption on the metal, catalyst contamination from the metal, and undesired metal reactivity are avoided in catalytic studies. Three variations on the reactor concept are examined.

Finally, our experience recommends monoliths as the only practical catalyst form for use in the all-glass internal recycle reactor. Moreover, the use of monolithic catalysts provides an additional important advantage over particulate forms in kinetic studies-namely significantly lower pore diffusional resistance enabling intrinsic rates to be measured over a wide range of temperature and pressure using either glass and metal tubular reactors (Jarvi et al., 1979) or glass and metal internal recycle reactors (Bartholomew, 1979).