Tailor-designing environmental catalysts

本研究的重点是汽车尾气控制催化剂的设计、制备和表征。目前制造的这些催化剂具有沿催化剂长度均匀分布的活性催化剂位置。然而，在操作过程中，反应梯度会发生变化，包括温度、表面物种浓度和气体成分浓度。这表明，通过在催化剂长度上制备设计的活性中心浓度梯度来利用这些反应参数梯度，可以改善性能，最终导致成本降低，性能改善，并可能延长寿命。基于这一前提，将设计、开发和评价两种催化剂系统：氧化催化剂和选择性催化还原催化剂。

The focus of the proposed research is designing, preparing and characterizing catalysts for automotive emissions control. These catalysts are currently manufactured with a homogeneous distribution of active catalyst sites along the length of the catalyst. However, reaction gradients evolve during operation, which includes temperature, surface species concentrations and gas component concentrations. This indicates that improved performance could be attained by preparing a designed gradient in active site concentration along the catalyst length to take advantage of these reaction parameter gradients, ultimately resulting in reduced costs, improved performance and likely improved longevity. Based on this premise, two catalyst systems will be designed, developed and evaluated; oxidation and selective catalytic reduction catalysts.