Catalyst Deactivation and Chemical Process Dynamics

催化剂失活和化学过程动力学

• 批准号: 8901946
• 负责人: John Butt
• 金额: $ 10.3万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-09-01 至 1991-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8901946&HistoricalAwards=false
• 关键词: Catalyst; Deactivation; Chemical; Process; Dynamics

Catalyst deactivation is an important, sometimes controlling, factor in many processed invloving catalytic chemical transformations. There are three major categories of deactivation: (1) Poisoning-the loss of activity by selective chemisorption of strongly bound impurties on the surface (2) Coking or fouling-the loss of activity by the for the formation of carbonaceous residues (3) sintering-the loss of activity by agglomeration producing loss of active surface area. Often more than one of thes mechanisms can act simultaneoulsy, particularly for reactions conducted at severe condition and with complex feed mixtures. This research project focusses on the congruent effects of catalyst decay by chemical poisoning and by coke formation, processes (1) and (2) above. The PI plans both theoretical analysis and experimental verification of the effects of these two processes on the dynamics of fixed bed catlystic the modification of diffusional limitations on rector performance by catalyst deactivation, both with respect to the influence on themain reaction considered as well as the rate of deactivation itself. Individual modes of deactivation as well as their combination will be studied.

催化剂失活是一个重要的，有时是控制， 在许多涉及催化化学品的加工过程中 转变 有三大类 失活： (1)中毒-活性的损失， 强结合杂质的化学吸附 表面 (2)结焦或结垢- 碳质残渣的形成 (3)烧结--因附聚而失去活性 产生活性表面积的损失。 通常不止一种机制可以起作用， 特别是对于在苛刻条件下进行的反应， 复杂的饲料混合物。 该研究项目的重点是 化学中毒引起的催化剂衰变的一致效应 以及通过上述方法（1）和（2）的焦炭形成。 PI计划理论分析和实验 验证这两个过程对 固定床催化动力学 催化剂对反应器性能的扩散限制 失活，无论是相对于影响的主要 反应以及失活率 本身 各种失活模式及其 将进行研究。