In this paper fluidization transition from Geldart B to A induced by change in temperature was visualized by high-temperature electrical capacitance tomography (ECT) recently developed. Silica particles with a Sauter mean diameter of 222 μm and density of 2650 kg/m³, which are typically Geldart B particles at ambient condition, were fluidized in a fluidized bed of 5 cm from 20 to 600 °C. With the increase in temperature, ECT images showed the decrease in superficial gas velocity corresponding to the onset of bubbles, i.e. the minimum bubbling velocity (U_mb) and homogeneous fluidization regime. The pressure drop versus superficial gas velocity curves confirmed the existence of homogeneous fluidization between the minimum fluidization velocity (U_mf) and U_mb at elevated temperature. Our detailed analysis confirms that the cohesive inter-particle forces, which manifest a linear increment with temperature, are responsible for the fluidization transition.