Single pellet crush strength testing catalysts

Single-Pellet Crush Strength Testing of Catalysts... 

With the development of catalytic processes such as reforming, hydrocracking and hydrotreating, which utilize formed particles, single pellet crush strength tests were devised by the manufacturers and users of such catalysts. These tests were developed in order to determine the ability of the catalyst particles to maintain integrity during use in catalytic reactors. (2)... 

Results of the second round robin testing of spheres and tablets are shown in Tables I and II. These data are included in ASTM Research Report Number 1004 for Standard Test Method D-4179 for Single Pellet Crush Strength of Formed Catalyst Shapes. 

A test method for single pellet crush testing of catalytic spheres and tablets was developed by ASTM Committee D-32 on Catalysts. A procedure for the single pellet crush strength of extrudates that gives satisfactory interlaboratory variation is yet to be attained. An alternate method will test the assumption that the inter laboratory variations, seen in all round robins, were caused by moisture absorption during testing and the use of a specialized anvil in the test instrument. 

---