Development of highly active coated monolith SCR catalyst with strong abrasion resistance for low-temperature application

Abstract

Monolith SCR catalysts coated with V₂O₅-WO₃/TiO₂ were prepared by varying binder and coating thickness. Comparing with a monolith extruded with 100% V₂O₅-WO₃/TiO₂ powder, a coated monolith with a catalyst-coating layer of 260 μm in thickness exhibited the similar initial NO_x reduction activity at 250°C. After 4 h abrasion (attrition) in an air stream containing 300 g·m⁻³ fine sands (50–100 μm) at a superficial gas velocity of 10 m·s⁻¹, the catalyst still has the activity as a 100% molded monolith does in a 24-h activity test and it retains about 92% of its initial activity at 250°C. Estimation of the equivalent durable hours at a fly ash concentration of 1.0 g·m⁻³ in flue gas and a gas velocity of 5 m·s⁻¹ demonstrated that this coated monolith catalyst is capable of resisting abrasion for 13 months without losing more than 8% of its initial activity. The result suggests the great potential of the coated monolith for application to de-NO_x of flue gases with low fly ash concentrations from, such as glass and ceramics manufacturing processes.

Keywords

coated monolith / low-temperature denitration / abrasion resistance / attrition

References

[1] Forzatti P. Present status and perspectives in de-NO_x SCR catalysis. Applied Catalysis A, General, 2001, 222(1): 221–236

[2] Moon L S, Su K S, Chang H S. Systematic mechanism study of the high temperature SCR of NO_x by NH₃ over a W/TiO₂ catalyst. Chemical Engineering Science, 2012, 79: 177–185

[3] Liu Z, Ihl W S. Recent advances in catalytic deNO_x science and technology. Catalysis Reviews, 2006, 48(1): 43–89

[4] Chen L, Li J, Ge M. Promotional effect of Ce-doped V₂O₅-WO₃/TiO₂ with low vanadium loadings for selective catalytic reduction of NO_x by NH₃. Journal of Physical Chemistry C, 2009, 113(50): 21177–21184

[5] Klovsky J R, Koradia P B, Lim C T. Evaluation of a new zeolitic catalyst for NO_x reduction with NH₃. Industrial & Engineering Chemistry Product Research and Development, 1980, 19(2): 218–225

[6] Matsumoto S. DeNO_x catalyst for automotive lean-burn engine. Catalysis Today, 1996, 29(1): 43–45

[7] Krocher O, Elsener M. Chemical deactivation of V₂O₅/WO₃-TiO₂ SCR catalysts by additives and impurities from fuels, lubrication oils, and urea solution-I. Catalytic studies. Applied Catalysis B: Environmental, 2008, 77(3−4): 215–227

[8] Li J, He H, Hu C, Zhao J. The abatement of major pollutants in air and water by environmental catalysis. Frontiers of Environmental Science & Engineering, 2013, 7(3): 302–325

[9] Hao J, He K, Duan L, Li J, Wang L. Air pollution and its control in China. Frontiers of Environmental Science & Engineering in China, 2007, 1(2): 129–142

[10] Willi R, Roduit B, Koeppel R, Wokaun A, Baiker A. Selective reduction of NO by NH₃ over vanadia-based commercial catalyst: Parametric sensitivity and kinetic modelling. Chemical Engineering Science, 1996, 51(11): 2897–2902

[11] Yang J, Ma H, Yamamoto Y, Yu J, Xu G, Zhang Z, Suzuki Y. SCR catalyst coated on low-cost monolith support for flue gas denitration of industrial furnaces. Chemical Engineering Journal, 2013, 230: 513–521

[12] Phil H H, Reddy M P, Kumar P A, Ju L K, Hyo J S. SO₂ resistant antimony promoted V₂O₅/TiO₂ catalyst for NH₃-SCR of NO_x at low temperatures. Applied Catalysis B: Environmental, 2008, 78(3): 301–308

[13] Yu J, Guo F, Wang Y, Zhu J, Liu Y, Su F, Gao S, Xu G. Sulfur poisoning resistant mesoporous Mn-base catalyst for low-temperature SCR of NO with NH₃. Applied Catalysis B: Environmental, 2010, 95(1): 160–168

[14] General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China, Standardization Administration of the People’s Republic of China. GB/T 17954−2007 Economical Operation of Industrial Boilers. Beijing: Standards Press of China, 2007 (in Chinese)

[15] Yu J, Guo F, Yang J, Wang Y, Xu G. A Surface Precipitated Honeycomb Denitration Catalyst and Its Preparation Method. China Patent, 2011, CN201210167211.5 (in Chinese)

[16] Yu J, Guo F, Li Q, Wang Y, Dong L, Gao S, Xu G. A New Denitration Catalyst Preparation Method. China Patent, 2010, CN201010537130.0 (in Chinese)

[17] Su J, Liu Q, Liu Z, Huang Z. Honeycomb CuO/Al₂O₃/cordierite catalyst for selective catalytic reduction of NO by NH₃ effect of Al₂O₃ coating. Industrial & Engineering Chemistry Research, 2008, 47(13): 4295–4301

[18] Zamaro J M, Ulla M A, Miró E E. The effect of different slurry compositions and solvents upon the properties of ZSM5-washcoated cordierite honeycombs for the SCR of NO_x with methane. Catalysis Today, 2005, 107: 86–93

[19] García-Bordejé E, Calvillo L, Lazaro M, Moliner R. Study of configuration and coating thickness of vanadium on carbon-coated monoliths in the SCR of NO at low temperature. Industrial & Engineering Chemistry Research, 2004, 43(15): 4073–4079

[20] Lei Z, Wen C, Chen B. Optimization of internals for selective catalytic reduction (SCR) for NO removal. Environmental Science & Technology, 2011, 45(8): 3437–3444

[21] Yamamoto S, Hikazudani S, Hino N, Shimizu K. End-treating Method for Catalyst-Carrying Honeycomb Structure in Exhaust Gas Denitration System. International Patent, 2013, WO2013125137 (A1)

Acknowledgements

The work was financially supported by the International Science and Technology Cooperation Program of China (2013DFA51530), National High Technology Research and Development Program of China (Grant No. 2010AA065004), and Strategic Priority Research Program of the Chinese Academy of Sciences (XDA07030300).

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg