Abstract: The kinetics and mechanism of coke deposition on cracking catalysts are reviewed and a kinetic model of coke deposition is presented. In this model, the process of coke deposition is divided into three steps: the first layer formation, the multi-layers formation and the plugging of pores. The regeneration kinetics of various kinds of commercial coked zeolite cracking catalysts is investigated. The reaction order of carbon burning is first order in respect of carbon content when the carbon content is higher than 0.1-0.2%(wt.), but it shifts from first order to 1.5 order when the carbon content is further lowered. The kinetic equations are presented. The fouling metals on catalysts catalyze the reaction of coke burning. During regeneration, the C:H ratios in coke do not change significantly versus the coke contents. It seems that the burning rate of hydrogen in coke is not faster than that of carbon during regeneration.

摘要： 本文提出了催化剂上结焦的动力学模型。此模型认为结焦过程可分为三个阶段:单层结焦、多层结焦及微孔堵塞。考察了各种工业用分子筛裂化催化剂的再生动力学,认为碳的燃烧可分为两个阶段:当碳含量大于0.1～0.2%(重)时,烧碳反应对含碳量为一级反应,而当含碳量进一步降低时,反应级数由一级转为1.5级。提出了烧碳反应动力学方程。在不同的再生反应深度下,焦碳的C/H比无明显变化,在再生过程中焦碳中的氢的燃烧速率并不比碳的燃烧速率快。