Mechanistic Studies of TiO2-based Mn/Ni Catalysts for the Low Temperature SCR of NOx with NH3

中温脱硝工艺在世界范围内得到了广泛应用，因为氨选择性催化还原（SCR）NO被广泛认为是环境保护的关键化学转化。然而，水和二氧化硫中毒是将用于处理替代燃料和化学原料的SCR催化剂的重要挑战。 主要研究者之前的工作已经证明Mn/TiO 2在低至80 oC的温度下具有活性，并且具有防水性。 为了提高对二氧化硫的耐受性，向该催化剂中添加Ni似乎是有希望的。 该研究将提供基于关键机理和光谱研究的Mn-Ni/TiO 2系统的基本理解。 将利用瞬态动力学方法，以提供新的见解的反应途径，并建立高选择性的基础。 主要研究者还将使用先进的仪器能力，如原位FTIR光谱与标记的化合物，以确定吸附的物种和活性中间体。 其他表面分析技术被巧妙地纳入拟议的工作。 这种方法的结合是优秀的现代催化研究的特点。这项研究的更广泛的影响包括对学生进行先进催化和表征技术的教育，并参与相关的技术应用。 学生将参与海报和论文演示，并在许多出版物的准备。 首席研究员致力于为研究项目招募代表性不足的少数族裔，包括与辛辛那提大学新的种族工程办公室合作。

Medium temperature DeNOx processes have been widely utilized throughout the world since the selective catalytic reduction (SCR) of NO by ammonia is widely recognized as a key chemical transformation for environmental protection. Hoewever, water and sulfur dioxide poisoning are important challenges for SCR catalysts that will be used to process alternative fuels and chemical feedstocks. Prior work by the principal investigator has demonstrated that Mn/TiO2 is active at temperatures as low as 80 oC and is resistant to water. Addition of Ni to this catalyst appears promising in order to enhance sulfur dioxide tolerance. The research will provide a fundamental understanding of Mn-Ni/TiO2 systems based on key mechanistic and spectroscopic investigations. Transient kinetic methods will be utilized in order to provide new insights into the reactions pathways and to establish the basis for high selectivity. The principal investigator will also use advanced instrumentation capabilities such as in situ FTIR spectroscopy with labeled compounds to determine adsorbed species and reactive intermediates. Other surface analysis techniques are skillfully incorporated into the proposed work. The combination of approaches is characteristic of excellent, modern catalysis research.The broader impacts of this research include education of students in advanced catalysis and characterization techniques and involvement in relevant technological applications. Students will be involved in poster and paper presentations and in preparation of numerous publications. The principal investigator is committed to recruiting under-represented minorities for the research program, including working with a new ethnic engineering office at the University of Cincinnati.