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催化剂活性非均匀分布分析——(Ⅰ)无外扩散和幂指数动力学的情形 被引量:1

ANALYSIS OF NONUNIFORM ACTIVITY DISTRIBUTION IN CATALYST PELLETS(Ⅰ)THE CASE OF N-TH ORDER CHEMICAL REACTION AND NEGLIGIBLE EXTERNAL MASS TRANSFER RESISTANCES
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摘要 本文采用正态函数逼近分析的方法,讨论了活性分布宽度对球形催化剂有效因子的影响。对于具有幂指数型动力学的放热反应,活性组分集中在最佳位置处的无限薄层上可得到最大有效因子η_(max),然而,分布宽度的略微增加会使有效因子迅速降至最小有效因子η_(max)。随着β值的增加,这种现象更加显著。若活性组分以一定宽度存在于颗粒内部,那么,分布位置必须向的内侧偏移一定距离才会使催化剂有最佳有效因子。因此,为使真实催化剂具有最佳有效因子,就必须在附近对分布宽度和位置再次进行优化。 Normal distribution function analysis is used to describe the nonuniform activity distribution in catalyst pellets and the effect of the activity distirbution width of a real catalyst on the effectiveness factor is investigated.For the exothermic reaction(β>0),the effectiveness factor is maximized by concentrating all the active component at a specific position in the pellet.However,the effectiveness factor will sharply go down to a minimum value once the active component is located about the position with a certain width,and this behavior becomes significant with the increase of β value.In this case,the distribution position of the active component should be moved toward a distance at the inside of the specific postion in order to make the catalyst to show best activity. Therefore,for a real catalyst the re-optimization of the distribution width and position must be performed about the specific position.
出处 《化学反应工程与工艺》 CAS CSCD 北大核心 1991年第4期386-391,共6页 Chemical Reaction Engineering and Technology
基金 中国科学院山西煤炭化学研究所所长基金
关键词 催化剂 活性 活性分布 正态函数 Activity distribution Normal function Catalyst Effectiveness factor Distribution width Optimal effectiveness factor
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同被引文献2

  • 1李永旺,CAMSE’92,1992年
  • 2吴华,化工学报,1984年,4期,283页

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