Nitrogen Oxide Reduction Using Methane or Methanol over Well-Characterized Dispersed Rare Earth Oxide Catalysts

在充分表征的分散稀土氧化物催化剂上使用甲烷或甲醇还原氮氧化物

• 批准号: 9633752
• 负责人: M. Albert Vannice
• 金额: $ 32.98万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9633752&HistoricalAwards=false
• 关键词: Nitrogen; Oxide; Reduction; Using; Methane

ABSTRACT CTS-9633752 This is an extension of studies on reduction of nitrogen oxides by methane. It has been established that certain rare-earth oxides, with or without promotion by strontium, have high specific activities for this reaction and activity is enhanced by excess oxygen. In this work, lanthana and neodymia (excellent catalysts in the bulk form) both with and without strontium promoter, are dispersed on high-surface-area supports such as alumina, silica, or zirconia. Catalytic behavior and rate expressions over a range of oxygen partial pressures are determined using a variety of reductants including methane, methanol, hydrogen, and carbon monoxide. The supported rare-earth-oxide catalysts are characterization by BET measurements, chemisorption of nitric oxide and other gases, X-ray diffraction, diffuse reflectance Fourier-transform infrared spectroscopy (DRIFTS), electron-spin resonance, thermal analysis, and isotopic kinetic studies. This work is directly relevant to the current efforts to control emissions of nitrogen oxides and reduce occurrence of acid rain. This technology is suitable for emission control in both stationary boiler (power plant) sources and lean-burn mobile (automotive) sources.

摘要CTS-9633752 这是甲烷还原氮氧化物研究的延伸。 已经确定，某些稀土氧化物，有或没有锶的促进，对该反应具有高的比活性，并且活性通过过量的氧而增强。 在这项工作中，氧化镧和氧化钕（体形式的优异催化剂），无论有没有锶促进剂，分散在高表面积的载体，如氧化铝，二氧化硅，或氧化锆。 使用各种还原剂，包括甲烷，甲醇，氢气和一氧化碳，确定在一定范围内的氧分压的催化行为和速率表达式。 负载型稀土氧化物催化剂通过BET测量、一氧化氮和其他气体的化学吸附、X射线衍射、漫反射傅里叶变换红外光谱（DRIFTS）、电子自旋共振、热分析和同位素动力学研究来表征。 这项工作与目前控制氮氧化物排放和减少 酸雨。 该技术适用于固定锅炉（发电厂）源和贫燃移动的（汽车）源的排放控制。