In order to operate efficiently, the catalyst needs not only excellent adsorption performance, but also good physical strength characteristics. Mechanical failure of porous pellets can lead to the formation of fragments and fines, which may cause various problems: uneven fluid flow distribution, blockages, large pressure drops on the reactor, changes in heat flux, downstream congestion dirt. Therefore, determining the mechanical strength of the solid catalyst is one of the key parameters to ensure a reliable and efficient reaction process.
Alfa Chemistry Catalysts provides customers with systematic catalyst mechanical performance testing. If necessary, we can assist other characterization methods to provide customers with more comprehensive catalyst mechanical performance analysis reports. Welcome to discuss your specific needs with us.
Side crushing strength (SCS) testing: The SCS testing, also known as the Brazilian test, is a single particle test method used to determine the strength of particles when they are compressed at two diametrically opposed contact points.
Figure 1. Typical load displacement curve during the SCS test of catalyst beads. 
Impact testing: The catalyst particles experience impacts on walls or other particles during their residence time in the bed reactor or during their pneumatic conveying. The strain rate during impact is very high, which may affect the mechanical properties, especially the tendency of crack propagation. Therefore, it is also necessary to test the mechanical strength of the particles under impact load.
Bulk crushing strength (BCS) test: In order to study the resistance of the particle bed under compressive load, a BSC test was performed. In the BCS test, the particle bed is quasi-statically compressed to a specified pressure in a cylindrical cup. After unloading, the material was carefully taken out of the cup and subjected to gravimetric analysis to determine the amount of fine powder and broken particles.
Shear cell test: In silos and moving bed reactors, the catalyst support beads are not only subjected to normal compressive stress, but also shear stress. In order to study the resistance of the catalyst particles in the failure zone where the shear strain is very high, a shear cell can be used for testing.
Evaluate the attrition and abrasion resistance of the granular catalyst. Commonly used wear test methods include SPENCE method-rotating tube and ASTM method D 4058-96-rotating drum.
The mechanical strength of the porous alumina catalyst support beads of the reformer used for continuous catalytic regeneration was measured by the impact test. Using this test method, the particle strength can be measured at a higher strain rate than the traditional crushing test method, so as to better simulate the pneumatic conveying and chute flow conditions, and can quickly test a large number of particles.
Figure 2. Impact sequences of catalyst carrier beads against a flat target obtained with a high-speed video camera.