ABSTRACT At present, the low temperature reactivity and resistance to SO 2 poisoning performance of environmentally friendly Ce‐based catalysts in the NH 3 ‐SCR reaction are still the main factor for practical application. In this work, Fe 3+ was introduced into the TiO 2 lattice using the hydrothermal method and substituted for part of Ti 4+ to form oxygen‐deficient structure in the Fe‐TiO 2 carrier, and active species CeW were loaded onto this defective carrier to test its catalytic performance. It was demonstrated that CeW/Fe‐TiO 2 catalyst with higher oxygen vacancy content exhibited better low temperature catalytic activity and superior resistance to SO 2 poisoning in NH 3 ‐SCR reaction. On the one hand, O v was able to optimize the electronic structure of the catalyst with electron enrichment in the Fe‐O v ‐Ti structural unit and electron transfer to surface Ce atom through oxygen vacancies, thus improving the chemical environment around Ce species. On the other hand, O v effectively adsorbed and activated oxygen and reactant molecule, and the NH 3 ‐SCR reaction proceeded through L‐H pathway, thus improving the low temperature performance of the CeW/Fe‐TiO 2 catalyst. Eventually, DFT results confirmed at the molecular level that the construction of oxygen vacancy defective structures effectively activated the reactant molecules and thus improved the catalyst efficiency.
Wang et al. (Sat,) studied this question.