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Abstract

This work investigated the nitrous oxide (NOx) storage process using alumina-based catalysts (K2 O/Al2 O3 , CaO/Al2 O3,  and BaO/Al2 O3 ). The feed was a synthetic exhaust gas containing 1,000 ppm of nitrogen monoxide (NO), 1,000 ppm i-C4 H10 , and an 8% O2  and N2  balance. The catalyst was carried out at temperatures between 250–450°C and a contact time of 20 minutes. It was found that NOx was effectively adsorbed in the presence of oxygen. The NOx storage capacity of K2 O/Al2 O3 was higher than that of BaO/Al2 O3.  The NOx storage capacity for K2 O/Al2 O3  decreased with increasing temperature and achieved a maximum at 250°C. Potassium loading higher than 15% in the catalyst negatively affected the morphological properties. The combination of Ba and K loading in the catalyst led to an improvement in the catalytic activity compared to its single metal catalysts. As a conclusion, mixed metal oxide was a potential catalyst for de-NOx process in meeting the stringent diesel engine exhaust emissions regulations. The catalysts were characterized by a number of techniques and measurements, such as X-ray diffraction (XRD), electron affinity (EA), a scanning electron microscope (SEM), Brunner-Emmett-Teller (BET) to measure surface area, and pore volume and pore size distribution assessments.

 

Keywords

NOx storage Lean de-NOx Exhaust catalyst Diesel exhaust Mixed metal oxide.

Article Details

How to Cite
Alsobaai, A. (2017). Storage of Nitrous Oxide (NOx) in Diesel Engine Exhaust Gas using Alumina-Based Catalysts: Preparation, Characterization, and Testing. The Journal of Engineering Research [TJER], 14(1), 64–73. https://doi.org/10.24200/tjer.vol14iss1pp64-73

References

  1. Alsobaai AM, Zakaria R, Hameed HB (2007a), Hydrocracking of petroleum gas oil over NiW/MCM-48-USY composite catalyst. Journal of Fuel Processing Technology 88: 921- 928.
  2. Alsobaai AM, Zakaria R, Hameed HB, (2007b), Characterization and hydrocracking of gas oil on sulphided NiW-MCM-48 catalysts. Chemical Engineering Journal 132(1-3): 173- 181.
  3. Alsobaai AM, Zakaria R, Hameed HB (2007c), Gas oil hydrocracking on NiW/USY catalyst: effect of tungsten and nickel loading. Chemical Engineering Journal 132(1- 3): 77-83.
  4. Athanasios GK, Margaritis K, Carlo B, Gabriele DB, Abdurrahman I, Ingemar D (2015), Impact of combination of EGR, SCR, and DPF technologies for the low-emission rail diesel engines. Emission Control Science and Technology 1(3): 213-225.
  5. Bethke KA, Kung MC, Yang B, Shah M, Alt D, Li C, Kung HH (1995), Metal oxide catalysts for lean NOx reduction. Catalysis Today 26: 169-183.
  6. Castoldi L, Nova I, Lietti L, Forzatti P (2004), Study of the effect loading for catalytic activity of Pt-Ba/Al2O3 model catalysts. Catalysis Today 96: 43-52.
  7. Centi G Arena GE, Perathoner S (2003), Nanostructured catalyst for NOx storagereduction and N2O decomposition. Journal of Catalysts 216: 443-454.
  8. Dawody J, Skonglundh M, Fridell E (2004), The effect of metal oxide additives (WO3, MoO3, V2O5, Ga2O3) on the oxidation of NO and SO2 over Pt/Al2O3 and Pt/BaO/Al2O3 catalysts. Journal of Molecular Catalysis A: Chemical 209: 215-225.
  9. Despres J, Koebel M, Kröcher o, Elsener, Wokaun A (2003), Storage of NO2 on BaO/TiO2 and the influence of NO. Applied Catalysis B: Environmental 43: 389-395.
  10. Epling WS, Parks JE, Campbell GC, Yezerets A, Currier NW, Campbell LE (2004), Further evidence of multiple NOx sorption sites on NOx storage/reduction catalysts. Catalysis Today 96: 21-30.
  11. Fanson PT, Horton MR, Delglass WM, Lauterbach J (2003), FTIR analysis of storage behavior and sulfur tolerance in barium-based NOx storage and reduction (NSR) catalysts. Applied Catalysis B: Environmental 46: 393-413.
  12. Fridell E, Skoglundh M, Westerberg B, Johansson S, Smedler G (1999), NOx Storage in barium-containing catalysts. Journal of Catalysis 183: 196-209.
  13. Halachev T, Antanasova P, Agudo AL, Arias MG, Ramirez J (1996), Activity of P-Ni- W/Al2O3 catalysts with varying phosphorus content in the hydrogenation of naphthalene. Catalysis A: General 136: 161-175.
  14. Josh AP, Jennifer AL, Todd JT, James EP (2013), Lean NOx trap chemistry under lean-gasoline exhaust conditions: impact of high NOx concentrations and high Temperature. Topics in Catalysis 56(1): 89- 93.
  15. Kabin KS, Muncrief RL, Harold MP (2004), NOx storage and reduction on a Pt/BaO/alumina monolithic storage catalyst. Catalysis Today 96: 79-89.
  16. Kim DH, Kwal JH, Szanyi J, Burton SD, Peden CH (2007), Water-induced bulk Ba(NO3)2 formation from NO2 exposed thermally aged BaO/Al2O3. Applied Catalysis B: Environmental 72: 234-240.
  17. Lietti L, Forzatti P, Nova I, Tronconi E (2001), NOx storage reduction over Pt-Ba/γ-Al2O3 catalyst. Journal of Catalysis 204: 175-191.
  18. Matsumoto S (2004), Recent advances in automobile exhaust catalyst. Catalysis Today 90: 183-190.
  19. Michael F, Andreas W, Bastian H, Sebastian K (2014), Particulate emissions from diesel engines: correlation between engine technology and emissions. Journal of Occupational Medicine and Toxicology 9:6.
  20. Milt VG, Pisarello ML, Miró EE, Querini CA (2003a), Abatement of diesel-exhaust pollutants: NOx storage and soot combustion K/La2O3 catalysts. Applied Catalysis B: Environmental 41: 397-414.
  21. Milt VG, Querini CA, Miró EE, Ulla MA (2003b), Abatement of diesel-exhaust pollutants: NOx adsorption on Co, Ba,K/CeO2 catalyst. Journal of Catalysis 220: 424-432.
  22. Su Y, Amiridis MD (2004), In situ FTIR studies of the mechanism of NOx storage and reduction on Pt/Ba/Al2O3 catalysts. Catalysis Today 96: 31-41.
  23. Sedlmair C, Seshan K, Jentys, Lercher JJ (2003), Elementary steps of NOx adsorption and surface reaction on a commercial storagereduction catalyst. Journal of Catalysis 214: 308-306.
  24. Takahashi N, Shinjoh H, Ijima T, Suzuku T, Yamazaki K, Yokota K, Suzuki H, Miyoshi N, Matsumoto S, Tanizawa T, Tanaka T, Tateishi S, Kasahara K (1996), The new concept 3-way catalyst for automotive leanburn engine: NOx storage and reduction catalyst. Catalysis Today 27: 63.
  25. Westerberg B, Fridell E (2001), A transient FTIR study of species formed during NOx storage in the Pt/BaO/Al2O3 system. Journal of Molecular Catalysis A: Chemical 165: 249-263.