Controlled Distribution of PGM in Transversal and Vertical Direction of Washcoat; New Approach for Targeting Emission at Cold Start and High Speed Region 2019-26-0144
Emission regulations are getting stricter over the years and therefore, new catalyst technology is essential in order to meet these stringent emission regulations. The focus of the new catalyst technology is to purify emission at cold start and high space velocity (SV) region which is considered to be the most challenging aspect, and various attempts have been made by several researchers to overcome this issue. For instance, some of the existing technologies with higher concentration of Platinum Group Metal (PGM) at the front side are able to purify cold emissions effectively. However, efficiency at high SV is a concern due to lower PGM concentration at the rear side. In another approach, selective deposition of PGM at the washcoat surface, which was aimed at purification of emission at high SV, lacks efficient purification of cold emissions. We believe that controlled distribution of PGM along (transversal) and perpendicular (vertical) to the gas flow direction is critical to achieve efficient purification at cold start and high SV region. Hence, we have developed a new technology with which we are able to control PGM distribution along transversal and vertical direction. The catalyst developed by this new technology shows significant reduction of cold emissions. In addition, it is also able to purify exhaust gases at high SV which makes this technology more attractive. Vehicle evaluation data clearly suggests that the newly developed catalyst shows improved performance over existing technology. The higher efficiency of newly developed catalyst could be attributed to optimized distribution of PGM along transversal and vertical direction which results in efficient interactions of exhaust gases and PGM sites.