It is still a big challge to improve the
alkali and
heavy metal resistance of deNOx catalysts for selective catalytic reduction (SCR) of NOx with NH3. In this study, a novel catalyst developed by pillaring
montmorillonite with
iron and
titanium (Fe-Ti-
MMT) was proposed. It is quite interesting that high resistance to alkaline and
heavy metals has been demonstrated by using Fe-Ti-
MMT catalysts. It has been demonstrated that the specific pillaring synthesis procedure and further addition of the Ti pillared sites greatly contributed to the wide active temperature window and enhanced the resistance to
alkali and
heavy metal. The higher ratio of active Fe2+ species, more active
acid sites, and enhanced
ammonia adsorption indicated the remarkable activity as well as K and Pb resistance. Moreover, the K and Pb
poisons would promote the generation of active adsorbed NOx species on the Fe-Ti-
MMT but induce the formation of stable inactive ones on that of Fe-
MMT, which greatly tuned the reaction pathways and improved the reaction rate for Ti modified Fe pillared
MMT catalysts. The strategy of incorporating Ti into the Fe pillared
MMT catalysts strongly provides a novel inspiration for keeping excellent NH3-SCR performance in the presence of
alkali/
heavy metal for NOx removal.