Figure shows the influence of the grinding ball diameter on the mechanocatalytic partial depolymerization of cellulose using two experiment series at rotational speeds of 350 rpm and 430 rpm. When comparing the two experiment series, two different trends can be observed. At a higher rotational speed of 430 rpm, the oligomer fraction decreases with increasing grinding ball diameter from 72 % with 2 mm grinding balls to 45 % with 4 mm grinding balls. At 350 rpm, on the other hand, the oligomer yield remains constant at around 40 %. A possible explanation is the Arrhenius approach, in which both the number of collisions and the reaction probability are decisive. The pre-exponential factor A corresponds to the number of collisions and the second term with the activation energy Ea, the ideal gas constant R and the temperature T to the reaction probability in classical chemical reactions. For the following discussion, the two terms are considered as a whole and it is assumed that the pre-exponential factor A corresponds to the mechanical impacts of the grinding balls.