Simultaneous treatment of organic compounds, CO, and NOx in the incineration flue gas by three-way catalyst

Improving the Activity of Rh/Al2O3 Catalyst for NO Reduction by Na Addition in the Presences of H2O and O2

“…The results also consistent with the works of Flores-Moreno et al [52] and Mendioroz et al [25]. When H 2 O introduced into the reactor and its content increased to 1.6 vol%, the peak intensity at 3,700-3,500 cm -1 assigned to OH species [36, [3,43]. However, the peak intensity at 1,500-1,300 cm -1 assigned to NO 3 and NO 2 species was increased (Fig.…”

“…Figure 1 depicts the schematic diagram of the reaction system for the catalyst tests. The activity test was measured [3,9,43]. Figure 2 also shows that the inhibition of H 2 O on the Rh/Al 2 O 3 catalyst decreased when the reaction temperature was higher than 300°C.…”

“…In recent years, many studies have addressed the effect of H 2 O on the catalyst for NO reduction [8][9][10][11][12][13][14][15][16] (Table 1). The major effects of H 2 O on the catalysts include: (1) competition with NO and reductant to adsorbed on the active sites of catalysts; (2) inhibit the formation of reaction intermediate; (3) promote or inhibit the adsorption of reductant, and (4) alter the chemical state of active metals. Most [20] indicated that adding K to Pt/Al 2 O 3 catalyst can increase its catalytic activity, but this promotion effect was decreased when H 2 O introduced into the reaction because the active sites were blocked by H 2 O.…”

“…Selective catalytic reduction (SCR) has been an attractive method for NO reduction because of its high control efficiency, low reaction temperature, and low energy/fuel requirement. Many studies have applied SCR for NO reduction and the feasible catalysts include transition metal catalysts (Cu, Fe, V, Co and Ni) supported by activated carbon [1,2], noble metal catalysts (Pd-Rh) supported on alumina [3] and some combined/modified metal catalysts (Pd-Na and Rh-Na) [4][5][6][7].…”

Effects of Na, Cu, Ni and Co Modifications on the Activity and Characteristics of Rh/Al2O3 Catalysts for NO Reduction

“…After SNCR treatment, the average concentration of NO during waste incineration is 70-120 ppm [1]; this value does not exceed the regulation limits but is quite near the threshold. Therefore, the best technology for NO removal, selective catalytic reduction (SCR), was used and studied [2][3][4] to treat the flue gas of waste incineration.…”