Influence of Partial Wetting on Single Catalyst Pellet Selectivity in Gas-Liquid Multireaction Systems

气液多反应系统中部分润湿对单催化剂颗粒选择性的影响

• 批准号: 8700554
• 负责人: Michael Harold
• 金额: $ 18.1万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-06-01 至 1990-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8700554&HistoricalAwards=false
• 关键词: Influence; Partial; Wetting; Single; Catalyst

Some commercially important chemicals are produced in trickle bed reactors where gaseous and liquid reactants flow cocurrently down through a fixed catalyst bed. An important feature of such three-phase system is that the catalyst pellet may exposed to an extremely nonuniform environment because the flowing liquid may only partially contact (wet) the pellet surface. Partial wetting can enhance or retard the rate of a reaction depending on whether the reaction is gas reactant limiting or liquid reactant limiting. The purpose of the proposed work is to devise a meachanism which will enable reactor designers to predict how the intrinsic catalytic selectivity is altered by the multiphase transport associated with partial wetting. The PIs plan to do both experimental as well as modelling work for this system. Initially, a single pellet reactor is to be constructed and reaction rates will be measured. Then four spherical pellets will be put together to simulate packing conditions in a large fuel scale reactor. In this setup liquid pockets can be created and their effect on the reaction rate evaluated. Facilities will thus exist to measure directly the relationship between the overall reaction rates (selectivity) and the wetting efficiency.

一些具有重要商业价值的化学品是在涓涓细流中生产的 气体和液体反应物流动的床反应器 并流向下通过固定催化剂床。 一个重要 这种三相体系的特征是催化剂颗粒 可能会暴露在极不均匀的环境中， 流动的液体可以仅部分地接触（润湿）颗粒 面 部分润湿可以增强或延缓 反应取决于反应是否是气体反应物 限制或液体反应物限制。 的目的 建议的工作是设计一种机制， 反应堆设计师预测， 选择性被多相输送改变， 部分湿润。 PI计划进行实验和建模工作 系统的最佳选择。 最初，一个单一的颗粒反应堆将被 构建并测量反应速率。 然后四 将球形颗粒放在一起以模拟填充 在大型燃料规模反应堆中的条件。 在此设置中，液体 可以产生口袋，并且它们对反应速率的影响 评估。 因此，将有设施直接测量 总反应速率之间的关系（选择性） 和润湿效率。