Abstract
1. Some physical characteristics of powder-form nickel-chrome catalyst have been determined. It has been shown that particles of various dimensions within the limits 0.16–0.5 mm, formed by grinding the standard pelletized catalyst, have practically identical shapes. 2. An empirical equation has been deduced, which allows calculation of the critical fluidization velocity of finely-dispersed nickel-chrome catalyst with an accuracy of ±5.5%. A method of conducting the experiment and of setting up the empirical equation has been described. 3. A simplified method of estimating the stability of fluidized catalysts for comparatively short terms of service has been recommended, according to which catalyst stability is characterized by a wear coefficient and a change of some parameter which unambiguously characterizes the hydrodynamic properties of the system. 4. The stability of nonpyrophoric nickel-chrome catalyst has been checked by the recommended method and it has been established that this catalyst, as one possessing sufficient stability under fluidizing conditions, can be proposed for use on an industrial scale.
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