y, the 2X rule (or gradation) is adopted. That is, the diameter of the ceramic ball should be twice the diameter of the adjacent catalyst, so that the distribution of the gas flow is the most uniform, and the pressure dro is minimal, the reactor is optimized.Chemical CompositionAl2O3+SiO2Al2O3SiO2Fe2O3MgOK2O+Na2O+CaOOther> 92%23-26%68-73%0.351/4''(6mm)>60>0.603/8''(10mm)>85>0.851/2''(13mm)>185>1.853/4''(19mm)>487>4.871''(25mm)>850>8.51-1/2''(38mm)>1200>122''(50mm)>5600>56Size and Tolerance (mm)