Yixiao Wang

Van der Maasweg 9, 2629 HZ Delft 
Room E2.220
Tel: *31 (0)15-2784396

Y. Wang-7@tudelft.nl

Photoresponsive porous materials

Vehicles with low CO2 emissions are being promoted and one effective approach to help address this issue is to popularize highly fuel efficient diesel vehicles and lean burn GDI vehicles. As part of this approach, limiting NOx emissions is a critical issue for diesel and GDI engines operated in lean conditions. In order to meet increasingly stringent emissions regulations in all countries, the development of a high performance deNOx system has become an important requirement[1]. 

The objective of this project is to make the most of NOx reduction effect in lean conditions by increasing the frequency of rich/lean cycles through supplying the reductant over short periods. A direct HC injection system using a fuel injector decoupled from the engine will be investigated as the reductant supplying method instead of a rich in-cylinder system, which may cause concerns about drivabillty. Recent progress in kinetic measuring techniques has made the analysis of reactions over catalysts intransient conditions possible. The fast transient behaviour of gas components in rich/lean conditions over an NSR Catalyst had shown that N2 is formed not only in rich conditions, but also during a number of seconds after switching from rich to lean[2].

New model washcoat formulations will be developed and screened. Once optimization is complete a fundamental study will be performed in order to investigate the mechanism of the underlying chemical processes. The LNT catalysts will be characterized and tested with step-response technology in order to determine their boundaries in respect to adsorption and conversion as a function of temperature and gas compositions and the frequency of hydrocarbon inject. Different LNT formulations will be tested in combination with different HC injection strategies to find the best combination of both. Sulfur resistance and catalyst life time under different simulated. 


The Scholarship Council of China (CSC) is gratefully acknowledged for financial support.


1. Inoue, M., et al., deNOx Performance and Reaction Mechanism of the Di-Air System. Topics in Catalysis, 2013: p. 1-4.

2. Bisaiji, Y., et al., Development of Di-Air-A New Diesel deNOx System by Adsorbed Intermediate Reductants. SAE International Journal of Fuels and Lubricants, 2012. 5(1): p. 380-388.