Characterisation of NH3 adsorption on a V-SCR catalyst

Abstract: All around the world the environmental focus is growing rapidly.The aim of thismaster’s thesis has been to work on developing experimental methodologies to achieve qualitatively, reliable and optimal data used on modelling. The selected study case is the analysis of ammonia adsorption on a V-SCR catalyst, which is an important step for future SCR-performance. Over the last years the mechanism of the V-SCR catalyst and the nature of its active sites have been widely discussed in order to be understood. However, so far, no clear conclusionshavebeen established about the catalytic mechanism, particularly on atomic level,thatdemonstrates the complexity of the catalytic chemistry within the SCR process. The kinetics of the adsorption of ammonia on a commercial V-SCR catalyst needs further investigation and much more knowledge is neededto understand the chemistry and the behavior behind it. In order to obtain this, new methods where high-quality data is achievedfor the adsorption phenomenon, need to be developed.The results from this workhas demonstrated the used method to be a reliable way to ensure reproductively dataat each temperature used for ammonia adsorption performed over a V-SCR catalyst. Further work with focus on the in-depth of the kinetics in the adsorptionprocessis needed.It is necessary toenhance the understanding ofthe behaviour of theadsorption on theactive sitesof the V-SCR catalyst surface as well as performing tests with lowerammoniaconcentrations for an even better understandingof the processes.