Promotion of Ni/H-BEA by Fe for NO sub(x) Reduction with Propane in a Lean-Burn Condition

• Published in: Energy & fuels 2011-10, Vol.25 (10), p.4377-4383-4377-4383
• Main Authors: Jiang, Jianqing, Pan, Hua, Sun, Guojin, Ye, Qing, Shao, Zhenhua, Shi, Yao
• Format: Article
• Language: English
• Subjects: Bimetals; Catalysts; Catalytic activity; Conversion; Iron; Nickel; Propane; Reduction; Tolerances
• ISSN: 0887-0624; 1520-5029
• DOI: 10.1021/ef200770f

The effect of iron addition to Ni/H-BEA on selective catalytic reduction of NO sub(x) with propane (C sub(3)H sub(8)-SCR) was investigated under a lean-burn condition. The addition of iron significantly lowered the optimum reaction temperature of Ni/H-BEA from 623 to 573 K. The 3Ni-1Fe/H-BEA catalyst had the highest activity among samples with different bimetal loading. NO sub(x) conversion of 100% was obtained at 573 K. Oxygen played an important role in activating NO and propane during the C sub(3)H sub(8)-SCR reaction. NO sub(x) conversion increased as the C sub(3)H sub(8)/NO molar ratio increased. A complete conversion of NO sub(x) was achieved with C sub(3)H sub(8)/NO = 1.25 at 573 K. The catalytic activity was inhibited slightly at a low SO sub(2) concentration (100 ppm) but decreased dramatically at a high SO sub(2) concentration (600 ppm) over different catalysts. The introduction of 10% water also exhibited a negative impact on the reduction of NO sub(x). The catalytic activity of Ni-Fe/H-BEA represented only a slight drop in the presence of 100 ppm SO sub(2) and 10% H sub(2)O. The addition of iron to Ni/H-BEA notably improved the tolerance of SO sub(2) and H sub(2)O.