Studies of Structured Catalytic Reactors

结构化催化反应器的研究

• 批准号: 6825-2013
• 负责人: Hayes, Robert
• 金额: $ 2.11万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=637914
• 关键词: Studies; Structured; Catalytic; Reactors

The catalytic oxidation of ammonia over platinum or platinum-rhodium catalysts is a crucial reaction for both the manufacture of nitric acid and in the catalytic exhaust gas after treatment systems for lean burn engines (e.g. with Diesel and natural gas fuels). In the first application, the oxidation of NH3 to NO is typically carried out industrially using a gauze type catalyst, which is composed of an alloy of platinum and rhodium. Nitrous oxide is a byproduct of the ammonia oxidation process. Although it is not a toxic substance, especially at the levels released to the atmosphere in this process, it is nonetheless a strong greenhouse gas, with a global warming potential about 310 times that of carbon dioxide. Currently, to minimize emissions of N2O from ammonia oxidation reactors, an auxiliary catalyst may be added after the gauze layers5. This catalyst is often in the form of pellets or Rashig ring in shape. There is currently great interest in this process, especially in Alberta, where significant greenhouse gas emission credits can be claimed for N2O abatement. The objectives of this work are:(1) Study and elucidate the mass and heat transfer behaviour in the boundary layers around the catalyst in gauze reactors;(2) Implement micro-kinetic models of ammonia oxidation into a CFD reactor model and validate same;(3) Compare the performance of different gauze designs using CFD and to compare with experimental performance;(4) Investigate methods for the reduction of N2O from ammonia oxidation reactors,

氨在铂或铂铑催化剂上的催化氧化是硝酸制造和稀薄燃烧发动机（例如使用柴油和天然气燃料）的催化废气后处理系统中的关键反应。在第一种应用中，工业上通常使用网状催化剂将NH3氧化成NO，该催化剂由铂和铑的合金组成。一氧化二氮是氨氧化过程的副产品。虽然它不是有毒物质，尤其是在这个过程中释放到大气中的含量，但它仍然是一种强温室气体，其全球变暖潜力约为二氧化碳的 310 倍。目前，为了最大限度地减少氨氧化反应器的 N2O 排放，可以在纱网层之后添加辅助催化剂5。这种催化剂通常呈颗粒状或拉希环状。目前人们对这一过程非常感兴趣，尤其是在阿尔伯塔省，该地区可以通过减少一氧化二氮来获得大量温室气体排放信用。这项工作的目标是：（1）研究和阐明网纱反应器中催化剂周围边界层的传质和传热行为；（2）将氨氧化的微观动力学模型应用到CFD反应器模型中并进行验证；（3）使用CFD比较不同网纱设计的性能并与实验性能进行比较；（4）研究氨氧化中还原N2O的方法 反应堆,