Catalytic Performance, Characterization, and Mechanism Study of Fe₂(SO₄)₃/TiO₂ Catalyst for Selective Catalytic Reduction of NOx by Ammonia

Environmentally-benign catalysts for the selective catalytic reduction of NOxfrom diesel engines: structure–activity relationship and reaction mechanism aspects

“…Usually, it is also accepted that NO can be molecularly adsorbed on the transition metal ion or it can dissociatively chemisorb on oxide ion vacancies of the metal oxide catalysts, and react with adsorbed NH 3 50 with high NO x conversion at 350-450 1C, they considered that the relatively strong Brønsted acid sites induced by sulfate species contributed substantially to the deNO x efficiency. Thus, the roles of Lewis acid sites and Brønsted acid sites in the NH 3 -SCR reaction over Fe 2 O 3 -containing catalysts are still in debate, and in future studies, we strongly recommend that the elucidation of the involvement of these two types of acid sites in the NH 3 -SCR reaction should be closely correlated to the reaction temperature.…”

Characterization and SCR Performance of Nano-Structured Iron-Manganese Oxides: Effect of Annealing Temperature

“…Among these catalysts, V 2 O 5 /TiO 2 in combination with MoO 3 and WO 3 has been commercialized in consequence of its high catalytic reactivity, including NO conversion, N 2 selectivity and resistance to sulfur poisoning, and mechanical strength. In view of high reaction temperature and environmental toxicity of vanadium species (Liu and He, 2010;Liu et al, 2011b;Ma et al, 2011;Youn et al, 2016), vanadium-free catalysts attracted much attention including M-zeolite catalysts (M-Fe, Cu, Mn, Mo) (Pérez-RamıŔez et al, 2004;Yoshida et al, 2004;Liu et al, 2011a;Ochońska et al, 2012;Schuricht and Reschetilowski, 2012;Mejri et al, 2016) and metal oxides catalysts (Fe, Mn, Cu, Ce, Cr, etc. ) (Kato et al, 1981;Baksh et al, 1992;Kapteijn et al, 1994;Chen et al, 1995;Schneider et al, 1995;Zhu et al, 1999;Eigenmann et al, 2006;Min et al, 2007;Xu et al, 2008;Liu et al, 2013a;Shin et al, 2016).…”

Highly dispersed iron vanadate catalyst supported on TiO2 for the selective catalytic reduction of NOx with NH3

“…[14][15][16][17][18][19][20][21][22] [23][24][25][26][27][28][29][30][31][32]. All the above-mentioned catalysts show relatively high deNO x efficiency in different temperature ranges, and the Fe-based catalysts among them usually show good NH 3 -SCR activity, N 2 selectivity, and H 2 O/SO 2 durability at medium or high temperatures above 200°C [23,29,30]. Therefore, it is promising to combine the advantages of vanadium species and iron species for the NH 3 -SCR process into one catalyst, such as an FeVO 4 catalyst, to enlarge the operation temperature window and enhance the N 2 selectivity at high temperatures.…”