Mixed Conducting Membrances For Nox Decomposition in Automobile Exhausts

该项目涉及设计和合成混合离子和电子导电膜，促进汽车尾气中氮氧化物的分解。该策略依赖于钙钛矿催化剂分解氮氧化物和氧化离子“泵”从活性部位去除氧气。导电膜和催化膜可以是相同的材料，也可以是不同的材料。研究目标包括固态电解槽催化剂的优化和混合导电膜组分的优化。本研究阐明了氮氧化物在催化位点的分解机理和维持长期活性所需的条件。鉴定了实现远离反应位点的快速氧化离子中介所必需的固态膜的特性；这些都是优化的操作在代表性的汽车排气温度。这是SBIR的第二阶段工作。它导致了一种长寿命、低成本的膜转换器，用于去除汽车尾气中的氮氧化物。//这项技术特别适用于稀燃发动机，这种发动机因其高燃油效率而有望在未来占据主导地位

This program involves the design and synthesis of mixed ionic and electronic conducting membranes that promote decomposition of nitrogen oxides in automobile exhaust. The strategy depends on a perovskite catalyst to decompose the nitrogen oxide and an oxide-ion "pump" to remove oxygen from the active site. The conducting membrane and catalytic membrane may be the same or different materials. Research objectives include optimization of the catalysts in solid-state electrolytic cells and optimization of the components of the mixed conducting membranes. The research clarifies the mechanism of decomposition of nitrogen oxides at catalytic sites and the conditions required to maintain long-term activity. Characteristics of the solid-state membrane necessary for achieving rapid oxide-ion mediation away from the reaction site are identified; these are optimized for operation at representative automobile exhaust temperatures. This is an SBIR Phase II effort. It leads to a long-life, low-cost, membrane converter for removing nitrogen oxides from automobile exhausts. This technology is especially applicable to lean-burn engines, which are expected to become dominant in the future because of their high fuel efficiency.//