Jet-cup attrition test

The Grace-Davison jet-cup attrition test is often used to test the friability of catalysts (e g., Weeks and Dumbill, 1990 Dessalces et al., 1994). The respective jet-cup apparatus is sketched in Fig. 5. The catalyst sample is confined to a small cup, into which air is tangentially added at a high velocity (about 150 m/s). Some authors (e.g., Dessalces et al., 1994)... 

Figure 5. Schematic drawing of the Grace-Davison jet-cup attrition test. (After Weeks and Dumbill, 1990.)...

ASTM fluidized bed and jet cup attrition tests can determine the attrition properties of pow-dered/pelleted catalysts. 

For application in fluidization and fluid-particle systems, the attrition index is probably the most important particle characteristic. The particle attrition can affect the entrainment and elutriation from a fluidized bed and thus subsequently dictate the design of downstream equipment. The attrition in a pneumatic transport line can change the particle size distribution of the feed material into a fluidized bed reactor and thus alter the reaction kinetics. Davuluri and Knowlton (1998) have developed standardized procedures to evaluate the Attrition Index employing two techniques, solids impaction on a plate and the Davison jet cup. The two test units used are shown in Figs. 6 and 7. They found that these two test techniques are versatile enough to be applicable for a wide range of materials, such as plastic, alumina, and lime-... 

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