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采用TPO-MS表征了3-甲基吡啶氯氟化反应积炭失活CrO-Al催化剂,发现催化剂的积炭由碳、氢、氮组成,并且烧炭温度上限为500℃。通过热重分析研究了该催化剂的烧炭动力学行为,发现相同反应条件下,随着反应时间延长,催化剂积炭量增加而且积炭种类从容易烧除的轻积炭向不易烧除的重积炭转化,因此不同反应时间的催化剂积炭有不同的烧炭动力学模型。选取反应5 h和反应10 h的积炭催化剂做烧炭再生动力学实验,分别建立两种积炭催化剂的烧炭再生动力学模型,并且与实际的烧炭数据进行拟合,线性相关系数R~2>0.97。
TPO-MS was used to characterize the inactivation of CrO-Al catalyst for 3-picoline chlorofluorination. It was found that the carbon deposition of the catalyst was composed of carbon, hydrogen and nitrogen, and the upper limit of carbon temperature was 500 ℃. The kinetic behaviors of the catalysts were investigated by TG analysis. It was found that with the increase of the reaction time, the amount of carbon deposited on the catalyst increased and the carbon deposition varied from easy-to-burn light carbon to hard-to-burn Carbon deposition, so different reaction time catalyst coke have different charring kinetic model. The kinetic experiments of charcoal regeneration were carried out with 5 hours of reaction and 10 hours of reaction. The kinetic models of charcoal regeneration were established and fitted with the actual carbon data. The linear correlation coefficient R ~ 2> 0.97.