CORDIS proporciona enlaces a los documentos públicos y las publicaciones de los proyectos de los programas marco HORIZONTE.
Los enlaces a los documentos y las publicaciones de los proyectos del Séptimo Programa Marco, así como los enlaces a algunos tipos de resultados específicos, como conjuntos de datos y «software», se obtienen dinámicamente de OpenAIRE .
Resultado final
The objective of the project was to realize efficient NOx control by applying the concepts of:
- Non-Faradaic Electrochemical Modification of Catalytic Activity (NEMCA), also known as Electrochemical Promotion (EP) to tune the surface potential and
- Dopant-Induced Metal-Support Interaction (DIMSI) to tune the metal electronic properties of Pt and Rh catalysts under conditions of lean-burn and diesel engine exhaust gases.
The achievement of the goal of developing a new catalytic device able to reduce NO with hydrocarbons and CO in the presence of gaseous O(2) was reached by specific studies of the application of NEMCA and DIMSI and their synergetic interaction, as well as by investigation of the chemisorptive and reactivity properties of the aforementioned catalytic systems.
The project had a basic and fundamental character due to the necessity to develop a large background set of fundamental data. This knowledge, which is of significant fundamental importance, can be easily transferred to other catalytic systems.
The project successfully demonstrated the applicability of the concepts of NEMCA and DIMSI for the development of novel DeNOx catalysts. In the case of dispersed catalysts, it was found that the modification of the support, by doping or by the use of mixed oxides, and the use of metal alloys leads to catalysts with enhanced DeNOx activity and selectivity and wider temperature windows of operation.
In particular, laboratory scale experiments showed that doped catalytic materials such as Rh/TiO(2) (W(6)(+)), Rh/TiO(2) (Ca(2)(+)), Pt/(TiO(2)-Al(2)O(30), and bimetallic catalysts such as Rh-Ru/Al(2)O(3) and Rh-Ag/Al(2)O(3) exhibit significantly improved performance, compared to the unmodified or monometallic catalysts. The results obtained indicate promising strategies for research in a crucial area of automotive emission control, which is the reduction of NO under lean conditions. However, further work is required before full-scale vehicle evaluation is justified.
The feasibility of electrochemical promotion was demonstrated for the first time in the presence of oxygen in the feed. Rh catalysts interfaced with YSZ show an enhancement in reactivity during NO reduction by propene/O(2) of a factor up to 150 and 60 for propene and NO conversion, respectively, with a 2-fold enhancement of nitrogen selectivity. Various breakthrough aspects have been discovered, among which the feasibility of electrochemical promotion in bipolar configuration and the practical possibility to bridge the gap between single film electrodes and practical catalysts.
This was achieved with the development of alternative NEMCA devices, employing electronically isolated catalyst configurations. Examples of such configurations are the multi-striped catalyst films and the so-called bipolar configuration of a plug flow reactor, the latter being the first successful attempt of applying electrochemical promotion to continuous tubular reactors suitable for final application.
Synergetic effects of combining electrochemical and chemical promotion were also explored and the possibility of integrating the advantages of these concepts has been demonstrated. However, the NEMCA and DIMSI catalysts and reactor configurations need to be further studied and improved before used in practical applications.
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