The increasingly stringent emission limits require high performances also at high mileage, increasing the need for reliable catalysts characterization during their whole useful life. Thermal ageing is the main problem: high temperatures, variable environment and the presence of water lead to a progressive deactivation of the components. Due to the cost of ageing a converter on-road or on an engine bench, much more rapid laboratory aging methods are now becoming very interesting, rising the problem of the correlation between real and accelerated ageing conditions. In this work a series of identical catalysts aged in different conditions are characterized in order to understand the correlation between the real and accelerated ageing protocols. Applying a wide spectrum of techniques (XRD, SEM, TEM, BET) a complete morphological characterization is performed and interlaced with functional testing, in order to understand the link between the catalysts modification due to thermal effects and their deactivation, and to allow the design of more realistic laboratory ageing protocols. The correlation between real samples, coming from an ageing on an engine, and laboratory ageing is good for the medium-high mileage sample, which results very similar in terms of performance and morphology with the sample aged at hydro-thermal condition. Some differences remain due to the chemical ageing, which was not possible to replicate on the laboratory scale.

日益严格的排放限值要求在高行驶里程下也具有高性能，从而增加了在其整个使用寿命期间对可靠的催化剂进行表征的需求。热老化是主要问题：高温，变化的环境和水的存在会导致组件逐渐失活。由于在道路上或在发动机工作台上对变流器进行老化的成本很高，现在，非常快速的实验室老化方法变得非常有趣，这增加了实际老化条件与加速老化条件之间的相关性问题。在这项工作中，对一系列在不同条件下老化的相同催化剂进行了表征，以了解实际老化方案和加速老化方案之间的关系。应用广泛的技术（XRD，SEM，TEM，BET）进行了完整的形态学表征，并与功能测试进行了交织，以了解由于热效应而引起的催化剂改性及其失活之间的联系，并允许设计更实际的实验室老化方案。对于中高里程样品，来自发动机老化的真实样品与实验室老化之间的相关性很好，在性能和形态方面，结果与在水热条件下老化的样品非常相似。由于化学老化，仍然存在一些差异，无法在实验室规模上复制。并允许设计更现实的实验室老化协议。对于中高里程样品，来自发动机老化的真实样品与实验室老化之间的相关性很好，在性能和形态方面，结果与在水热条件下老化的样品非常相似。由于化学老化，仍然存在一些差异，无法在实验室规模上复制。并允许设计更现实的实验室老化协议。对于中高里程样品，来自发动机老化的真实样品与实验室老化之间的相关性很好，在性能和形态方面，结果与在水热条件下老化的样品非常相似。由于化学老化，仍然存在一些差异，无法在实验室规模上复制。