Abstract: The quality indexes of catalyst，like particle size distribution, strength and sphericity, have a great influence on the catalytic process, especially for the supported catalysts used in non-fixed beds. Drying is one of the keys to the preparation of catalysts and greatly affects the quality index of catalysts. A coupling equipment of impregnating and drying was developed to improve the catalyst quality. Based on the demands of the process，a three dimensional model for the coupling equipment was established and the two-phase CFD simulations was conducted with Euler-Euler model. According to the information of flow field and gas-solid two-phase distribution in the dryer, the optimal feeding tube length was obtained. It provides reliable guidance for the design and scale-up of catalyst impregnated dryer.

Key words: supported catalyst, impregnating and drying, CFD, Euler-Euler model