Influence of Co or Ce addition on the NOx storage and sulfur-resistance performance of the lean-burn NOx trap catalyst Pt/K/TiO2-ZrO2

Cu/Ba/bauxite: an Inexpensive and Efficient Alternative for Pt/Ba/Al2O3 in NOx Removal

“…The presence of SO 2 results in a slight decrement of NO x storage capacity in Cu/Ba/bauxite-SO 2 , while a sharp decrement was observed in Pt/Ba/Al 2 O 3 -SO 2 , which was mainly caused by the sulfation of storage component Ba, resulting in less Ba sites available to NO x storage. However, the presence of Fe, Ti and Cu in Cu/Ba/bauxite-SO 2 contributes to suppress the formation of BaSO 4 to a certain degree913. As a result, Cu/Ba/bauxite shows much higher NO x storage capacity than Pt/Ba/Al 2 O 3 in the presence of SO 2 .…”

“…One effective strategy is to add the inexpensive transition metal oxides into Pt/Ba/Al 2 O 3 91011. The synergetic effect between the additives and catalysts can provide a positive structural and electrical environment for NSR.…”

Prominent enhancement of La2O3 addition to the support on the NOx storage and sulfur-resistance performance of Pt/K/TiO2–Al2O3 lean-burn NOx trap catalysts

“…For the sulfated Pt/K/TAL(0), the main peak at 538 C can be attributed to the reduction of bulk potassium sulfates [33]. The shoulder peak at 455 C may correspond to the reduction of surface aluminum sulfates [32,33] because the support also possesses this peak. The very weak peak at 335 C is attributed to the reduction of surface sulfates of aluminum [12].…”

“…S5, which is contrary to the demand for rapid response of LNT catalyst, even if its NO x storage capacity is rather high. According to literatures [33,37], the NO x storage performance is highly related to the oxidation ability of the catalysts for NO to NO 2 oxidation. In this study, the concentrations of NO and NO 2 in the feed gas are kept almost invariable, about 250 and 150 ppm, respectively.…”

A short review about NOx storage-reduction catalysts based on metal oxides and hydrotalcite-type anionic clays

“…For example, the catalytic Pt/K/TiO 2 -ZrO 2 system (Liu et al, 2008;Zou et al, 2009) received more attention due to its excellent performance in NO x storage and sulfur resistance. Moreover, the Pt (1.0 wt.%) / K (7.0 wt.%) / TiO 2 -ZrO 2 catalysts promoted with Co (5.0 wt.%) or Ce (5.0 wt.%) were studied (Zou et al, 2009). The Co or Ce addition greatly improved the NO x storage capacity of Pt/K/(TiO 2 -ZrO 2 ) due to the enhanced oxidation ability and the release of more K sites.…”