Advertisement

Dynamics of Two-Step CO Oxidation Light-Off on Pt/\(\gamma\)-Al\(_2\)O\(_3\) and Pd/\(\gamma\)-Al\(_2\)O\(_3\) in the Presence of C\(_3\)H\(_6\)

  • Jan Březina
  • Panagiotis Boutikos
  • Adéla Buzková Arvajová
  • Rudolf Pečinka
  • Petr KočíEmail author
Original Paper
  • 37 Downloads

Abstract

Although the kinetics of CO and hydrocarbon (HC) oxidation reactions on three-way catalyst and diesel oxidation catalysts for automotive exhaust gas aftertreatment has been studied for a couple of decades, there are still some phenomena affecting the catalyst performance and pollutant conversion that need to be better understood and controlled. Two-step CO light-off is an undesired effect that significantly delays the process of reaching full CO conversion in the exhaust gas mixture including also hydrocarbons. In such a case CO light-off curve exhibits a plateau or shoulder where the CO conversion does not increase or even temporarily decreases with temperature, though there is enough O\(_2\) available for both CO and HC oxidation. The onset of hydrocarbon oxidation may inhibit the CO conversion due to blocking of active catalytic sites by adsorbed reaction intermediates. Furthermore, CO can be released as a by-product of the hydrocarbon oxidation. In this contribution we present the results of a systematic experimental study exploring these phenomena on Pt/\(\gamma\)-Al\(_2\)O\(_3\) and Pd/\(\gamma\)-Al\(_2\)O\(_3\) catalysts. Pt/\(\gamma\)-Al\(_2\)O\(_3\) showed larger decrease of CO conversion caused by accumulation of the surface intermediates. On the contrary, the production of CO by incomplete C\(_3\)H\(_6\) oxidation was higher on Pd/\(\gamma\)-Al\(_2\)O\(_3\). Overall extent of the two-step CO light-off effect was higher on Pt/\(\gamma\)-Al\(_2\)O\(_3\).

Keywords

Exhaust gas aftertreatment CO oxidation Hydrocarbon oxidation Inhibition Pt/\(\gamma\)-Al\(_2\)O\(_3\) catalyst Pd/\(\gamma\)-Al\(_2\)O\(_3\) catalyst 

Notes

Acknowledgements

The work was financially supported by the Czech Science Foundation (GA 17-26018S) and specific university research (MSMT No 20-SVV/2018).

References

  1. 1.
    Torregrosa AJ, Broatch A, García A, Mónico LF (2013) Sensitivity of combustion noise and NOx and soot emissions to pilot injection in PCCI diesel engines. Appl Energy 104:149–157CrossRefGoogle Scholar
  2. 2.
    Lu X, Han D, Huang Z (2011) Fuel design and management for the control of advanced compression-ignition combustion modes. Prog Energy Combust Sci 37:741–783CrossRefGoogle Scholar
  3. 3.
    Summers JC, Louis Hegedus L (1978) Effects of platinum and palladium impregnation on the performance and durability of automobile exhaust oxidizing catalysts. J Catal 51:185–192CrossRefGoogle Scholar
  4. 4.
    Kaneeda M, Iizuka H, Hiratsuka T, Shinotsuka N, Arai M (2009) Improvement of thermal stability of NO oxidation Pt/\(\gamma\)-Al\(_2\)O\(_3\) catalyst by addition of Pd. Appl Catal B 90:564–569CrossRefGoogle Scholar
  5. 5.
    Pliangos C, Yentekakis IV, Papadakis VG, Vayenas CG, Verykios XE (1997) Support-induced promotional effects on the activity of automotive exhaust catalysts: 1. The case of oxidation of light hydrocarbons (C\(_2\)H\(_4\)). Appl Catal B 14:161–173CrossRefGoogle Scholar
  6. 6.
    Voltz SE, Morgan CR, Liederman D, Jacob SM (1973) Kinetic study of carbon monoxide and propylene oxidation on platinum catalysts. Ind Eng Chem Prod Res Dev 12:294–301CrossRefGoogle Scholar
  7. 7.
    Patterson MJ, Angove DE, Cant NW (2000) The effect of carbon monoxide on the oxidation of four C6 to C8 hydrocarbons over platinum, palladium and rhodium. Appl Catal B 26:47–57CrossRefGoogle Scholar
  8. 8.
    Hazlett MJ, Epling WS (2016) Spatially resolving CO and C\(_3\)H\(_6\) oxidation reactions in a Pt/\(\gamma\)-Al\(_2\)O\(_3\) model oxidation catalyst. Catal Today 267:157–166CrossRefGoogle Scholar
  9. 9.
    Hazlett MJ, Moses-Debusk M, Parks JE, Allard LW, Epling WS (2017) Kinetic and mechanistic study of bimetallic Pt-Pd/\(\gamma\)-Al\(_2\)O\(_3\) catalysts for CO and C\(_3\)H\(_6\) oxidation. Appl Catal B 202:404–417CrossRefGoogle Scholar
  10. 10.
    Buzková Arvajová A, Březina J, Pečinka R, Kočí P (2018) Modeling of two-step CO oxidation light-off on Pt/\(\gamma\)-Al\(_2\)O\(_3\) in the presence of C\(_3\)H\(_6\) and NOx. Appl Catal B 233:167–174CrossRefGoogle Scholar
  11. 11.
    Lang W, Laing P, Cheng Y, Hubbard C, Harold MP (2017) Co-oxidation of CO and propylene on Pd/CeO\(_2\)-ZrO\(_2\)and Pd/\(\gamma\)-Al\(_2\)O\(_3\) monolith catalysts: a light-off, kinetics, and mechanistic study. Appl Catal B 218:430–442CrossRefGoogle Scholar
  12. 12.
    Daneshvar K, Dadi RK, Luss D, Balakotaiah V, Kang SB, Kalamaras CM, Epling WS (2017) Experimental and modeling study of CO and hydrocarbons light-off on various Pt-Pd/\(\gamma\)-Al\(_2\)O\(_3\) diesel oxidation catalysts. Chem Eng J 323:347–360CrossRefGoogle Scholar
  13. 13.
    Herrmann M, Hayes RE, Votsmeier M (2018) Propene induced reversible deactivation effects in diesel oxidation catalysts. Appl Catal B 220:446–461CrossRefGoogle Scholar
  14. 14.
    Agarwal AK, Singh AP, Maurya RK (2017) Evolution, challenges and path forward for low temperature combustion engines. Prog Energy Combust Sci 61:1–56CrossRefGoogle Scholar
  15. 15.
    Koop J, Deutschmann O (2009) Detailed surface reaction mechanism for Pt-catalyzed abatement of automotive exhaust gases. Appl Catal B 91:47–58CrossRefGoogle Scholar
  16. 16.
    Hauff K, Tuttlies U, Eigenberger G, Nieken U (2010) A global description of DOC kinetics for catalysts with different platinum loadings and aging status, Appl Catal B 100:10–18CrossRefGoogle Scholar
  17. 17.
    Raj R, Harold MP, Balakotaiah V (2015) Steady-state and dynamic hysteresis effects during lean co-oxidation of CO and C\(_3\)H\(_6\) over Pt/Al\(_2\)O\(_3\) monolithic catalyst. Chem Eng J 281:322–333CrossRefGoogle Scholar
  18. 18.
    Kapička J, Marek M (1989) Oscillations on individual catalytic pellets in a packed bed: CO oxidation on Pt/Al\(_2\)O\(_3\). J Catal 119:508–511CrossRefGoogle Scholar
  19. 19.
    Sá J, Abreu Fernandes DL, Aiouache F, Goguet A, Hardacre C, Lundie D, Naeem W, Partridge WP, Stere C (2010) SpaciMS: spatial and temporal operando resolution of reactions within catalytic monoliths. Analyst 135:2260–2272CrossRefGoogle Scholar
  20. 20.
    Kočí P, Kubíček M, Marek M (2004) Modelling of TWC monolith converters with microkinetics and diffusion in the washcoat. Ind Eng Chem Res 43:4503–4510CrossRefGoogle Scholar
  21. 21.
    Kočí P, Nevoral V, Záhrubský M, Kubíček M, Marek M (2004) Nonlinear dynamics of automobile exhaust gas converters: the role of nonstationary kinetics. Chem Eng Sci 59(22–23):5597–5605CrossRefGoogle Scholar
  22. 22.
    Arvajová A, Kočí P, Schmeißer V, Weibel M (2016) The impact of CO and C3H6 pulses on PtOx reduction and NO oxidation in a diesel oxidation catalyst. Appl Catal B 181:644–650CrossRefGoogle Scholar
  23. 23.
    Boutikos P, Březina J, Buzková Arvajová A, Kočí P (2019) Comparison of O2 and NO2 impact on PtOx and PdOx formation in diesel oxidation catalysts and their reduction by CO and C3H6 pulses. Chem Eng J.  https://doi.org/10.1016/j.cej.2018.08.040 CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Chemical EngineeringUniversity of Chemistry and Technology, PraguePragueCzech Republic

Personalised recommendations