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Features of the Mechanism of Catalytic Oxidation of Carbon Monoxide on Pd/Al2O3 Catalysts

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Article Type Research Article
Subject General Science
OCLC JBRES Record
Kakhniashvili G, Bakhtadze S and Nakhutsrishvili I
Issue: Volume7-Issue2
Pages: 1-8
Received: 2026-01-30
Accepted: 2026-02-07
Published: 2026-02-09

Abstract

The mechanism of catalytic low-temperature oxidation of CO on Pd/Al2O3 was studied. A combined reaction mechanism through the formation and decomposition of carboxyl-type structures was proposed, in which adsorbed oxygen reoxidizes reduced palladium atoms and ensures the decomposition of carboxyl structures with the formation of CO2 and the regeneration of OH groups. It was shown that with a small addition of Pd the activity of the catalyst increases significantly. The positive effect is due to the activation of CO or a change in the state of oxygen on the surface of the catalyst. Palladium was estimated by the value of hydrogen adsorption at 70°C. The reaction rate of catalytic oxidation of carbon monoxide, as the main characteristic of the activity and efficiency of the studied catalysts, was measured on a circulation-static unit using the method of continuous analysis of the gas mixture. The higher SCA of supported palladium in comparison with massive palladium in the reaction of low-temperature oxidation of CO may be associated with the written-off mechanism. This assumption is consistent with the TDA data. Close values ??of the adsorption energy of CO on the compared objects indicate a practically identical state of adsorbed CO on supported and massive palladium. However, the concentration of this form of CO, active in the oxidation reaction, on Pd/Al2O3 is approximately two orders of magnitude higher. Pd black adsorbs CO mainly in a weakly bound, low-activity form, which is reversible already at 100°C. For Pd black, which has no hydroxyl coating, a mechanism is realized with the participation of CO molecules and adsorbed oxygen atoms in intermediate complexes. The decomposition of these complexes is consistent with the high activation energy. The effect of superadditive adsorption capacity for carbon monoxide and specific catalytic activity in the reaction of low-temperature oxidation of CO was found. It was also discovered that the low-temperature oxidation reaction of CO on catalysts of the Pd/Al2O3 system can proceed via a non-trivial mechanism, which includes the participation of hydroxyl groups of the Al2O3 surface, coordinated by palladium, in the reaction.

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© 2026 Kakhniashvili G, et al. Distributed under Creative Commons CC-BY 4.0 Creative CommonsAttribution

How to cite this article

Kakhniashvili G, Bakhtadze S, Nakhutsrishvili I. Features of the Mechanism of Catalytic Oxidation of Carbon Monoxide on Pd/Al2O3 Catalysts. J Biomed Res Environ Sci. 2026 Feb 09; 7(2): 8. Doi: 10.37871/jbres2263

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Physical Chemistry

References

  1. Pekka S, Bredenberg J. Catalytic purification of tarry fuel gas. Fuel. 1990;69(10):1219-1225. doi: 10.1016/0016-2361(90)90280-4.
  2. Noskov AS. Catalytic purification of gases from organic admixtures and nitrogen oxides in the regime of a moving heat wave. Combust Explos Shock Waves. 1997;33:284-293. doi: 10.1007/BF02671867.
  3. Ivanenko O, Trypolskyi A, Dovholap S, Didenko O, Shabliy T, Karvatskii A, Mikulionok I, Krysenko T., Vahin A, Strizhak P. Development of an innovative catalyst for neutralization of carbon monoxide in multi-chamber kilns of electrode blanks. EUREKA: Physics and Engineering. 2024; 3:17-35. doi: 10.21303/2461-4262.2024.003398.
  4. Lyu F, Qiao J, Xu X, Zeng Y, Zhong Z, Xing W. Simple preparation of V2O5-WO3/TiO2/SiC catalytic membrane with highly efficient dust removal and no reduction. Separation and Purification Technology. 2024;343:127155. doi: 10.1016/j.seppur.2024.127155.
  5. Büker K, von Morstein O, Yildirim Ö, Daheim N, Frey A, Voss Ch, Geisbauer A. Purification of steel mill gases under changing feed stock conditions. Chemie Ingenieur Technic. 2024;96(9):1218-1223. doi: 10.1002/cite.202400031.
  6. Pfeifer S, Pasel Sh, Bläkeret Ch, Eckardt T, Klinkenberg N, Eggebrecht J, Gleichmann K, Bathen D. Catalytic COS Formation on Ion-Exchanged LTA Zeolites During Adsorption. Microporous and Mesoporous Materials 2025 February 1; 383: 113408. doi:
  7. https://doi.org/10.1016/j.micromeso.2024.11340
  8. Faber J, Brodzik K. Influence of Preparation and Analysis Methods on Determination of Rh, Pd and Pt Content in Automotive Catalysts Samples. Materials Science and Engineering 2018 421(4): 042018. doi: 10.1088/1757-899X/421/4/042018.
  9. Watanabe Y. Encyclopedia of interfacial chemistry: Surface science and electrochemistry, Elsevier Inc., Bonn; 2018. p.265.
  10. Salanov A, Serkova A, Isupova L, Tsybulya S, Parmon, V. Catalytic etching and oxidation of platinum group metals: Morphology, chemical composition and structure of Pt, Pd and Rh foils in the O2 atmosphere and during NH3 oxidation with Air at 1133 K. Catalysts. 2023;13;13(2):249. doi: 10.3390/catal13020249.
  11. Sharma H, Bisht A, Sethulakshmi N, Sharma S. Catalysis by substituted platinum (ionic Pt) catalysts. Hydrogen Energy, Part B. 2024;51:748-768. doi: 10.1016/j.ijhydene.2023.08.343.                            
  12. Kamalov GK, Povolotskii EY, Silant'eva OA, En Man C. Role of the support in the formation of the active phase of catalysts for the hydrogenation of carbon monoxide. Theoretical and Experimental Chemistry. 1991;27:487-493. doi: 10.1007/bf01372704.
  13. Soubaihi RL, Saoud KM, Awadallah-F A, Elkhatat AM, Al-Muhtaseb Sh-A, Dutta J. Investigation of palladium catalysts in mesoporous silica support for CO oxidation and CO2 adsorption. Heylon. 2023;9(7):e18354. doi: 10.1016/j.heliyon.2023.e18354.
  14. Zhang J, Shu M, Niu Y, Yi L, Yi H, Zhou Y, Zhao Sh, Tang X, Gao F. Advances in CO catalytic oxidation on typical noble metal catalysts: mechanism, performance and optimization. Chemical Enginering. 2024;495:153523. doi: 10.1016/j.cej.2024.153523.
  15. García-Martínez F, Turco E, Schiller F, Enrique Ortega JE. CO and O2 Interaction with kinked Pt surfaces. ACS Catalysis. 2024;14:6319-6327. doi: 10.1021/acscatal.4c00435.
  16. Melani G, Nagata Y, Saalfrank P. Vibrational Energy Relaxation of interfacial OH on a water-covered ?-Al2O3(0001) surface: A non-equilibrium ab initio molecular dynamics study. PhysChemChemPhys. 2021;23(13):7714. doi: 10.1039/D0CP03777J.
  17. Prasetyo N, Hofer TS. Adsorption and dissociation of water molecules at the ?-Al2O3(0001) surface: A 2-dimensional hybrid self-consistent charge density functional based tight-binding/molecular mechanics molecular dynamics (2D SCC-DFTB/MM MD) simulation study. Computational Materials Science. 2019;164:195-204. doi: 10.1016/j.commatsci.2019.04.006.
  18. Zhang X, Arges ChJ, Kumar MM. Computational investigations of the water structure at the ?-Al2O3(0001)-water interface. Physical Chemistry C. 2023;127(31):15600-15610. doi: 10.1021/scs.jpcc.3c03243.
  19. Sun Sh, Yao H, Pan J, Xian Z. The bonded interfacial layer structure of ?-Al2O3 (0001)/water at different pH values studied by sum frequency vibrational spectroscopy. Chemical Physics. 2024;16(21)1:214708. doi: 10.1063/5.0235695.
  20. Kozerozhets IV, Semenov EA, Avdeeva VV, Ivakin YuD, Kupreenko SYu, Egorov AV, Kholodkova AA, Vasil'ev MG, Kozlova LO, Panasyuk GP. State and forms of water in dispersed aluminum oxides and hydroxide. Ceramics International. 2023;49(18):30381-30394. doi: 10.1016/j.ceramint.2023.06.300.
  21. Patra ShG, Meyerstein D. On the mechanism of heterogeneous water oxidation catalysis: A theoretical perspective. Inorganics. 2022;10(11):182. doi: 10.3390/inorganics10110182.  
  22. Luo X, Wang Y, Wu B, Wang Y, Li C, Shao M, Liu B, Wei Z. A Stepwise Electrochemical Baeyer-Villiger Oxidation with Water as the Oxygen Source. J Phys Chem Lett. 2024 Oct 24;15(42):10435-10441. doi: 10.1021/acs.jpclett.4c02342. Epub 2024 Oct 10. PMID: 39388520.
  23. Yildiz I. Stepwise or concerted or a hybrid mechanism for berberine bridge enzyme?: A computational mechanistic study by QM-MM and QM methods. Molecular Structure. 2024;1300:137247. doi: 10.1016/j.molstruc.2023.137247.
  24. Pospíšil P, Prasad A, Rác M. Mechanism of the Formation of Electronically Excited Species by Oxidative Metabolic Processes: Role of Reactive Oxygen Species. Biomolecules. 2019 Jul 5;9(7):258. doi: 10.3390/biom9070258. PMID: 31284470; PMCID: PMC6681336.
  25. Vandenborre J, Truche L, Costagliola A, Craff E, Blain G, Baty V, Haddad F, Fattahi M. Carboxylate anion generation in aqueous solution from carbonate radiolysis. A potential route for abiotic organic acid synthesis on earth and beyond. Earth and Planetary Science Letters. 2021;564:116892. doi: 10.1016/j.epsl.2021.116892.
  26. Hu W, Liu Z, Chen L, Wang T, Hu Y, Long R, Liu D, Li B. Enhanced photocatalytic CO2 reduction to CH4via restorable surface Plasmon and Pdn–W?+ synergetic sites. Inorganic Chemistry Frontiers. 2024;15:4576-4589. doi: 10.1039/D4QI00812J.
  27. Duca G. Homogeneous catalysis with metal complexes: Fundamentals and applications. Springer: New York; 2012. p. 422.
  28. Rogers EM. Diffusion of innovations. 5th ed. Free Press; 2023. p. 236.
  29. Takita Y, Moro-oka Y, Ozaki A. Catalytic oxidation of olefins over oxide catalysts containing molybdenum: VI. Kinetics of propylene oxidation to form acetone over SnO2MoO3. Catalysis. 1978;52(1):95-101. doi: 10.1016/0021-9517(78)90126-4.
  30. Ai M, Ozaki A. Improvement of acetone yield in the oxidation of propylene. Bulletin of the Chemical Society of Japan. 1979;52(5):1454-1458. doi: 10.1246/bcsj.521454.                                                  
  31. Wang L, Zhang X, Sun Y, Xu M, Zhang J, Zhu Y, Zhu L, Qiao S, Ma J, Wei J, Lin F. Environmental water-mediated dual-mechanism regulation of PtCu?-MnOx-catalyzed acetone oxidation: enhancement of MvK and inhibition of L-H mechanism. Environmental Chemical Engineering. 2024;12(5):113957. doi: 10.1016/j.jece.2024.113957.
  32. Li M, Shen J. Microkinetic Analysis for the selective oxidation of propylene to acetone over vanadia/titania. Applied Catalysis A: General .2003;246(2):351-363. doi: 10.1016/S0926-860X(03)00053-X.
  33. Mamusi F, Zarifnia Z, Farmanzadeh D. Theoretical investigation of carbon monoxide oxidation on two-dimensional aluminum carbide. Results in Chemistry. 2024;13:101962. doi: 10.1016/j.rechem.2024.101962.
  34. Iancu AC, Nicolaev A, Apostol NG, Abramiuc LE, Teodorescu CM. Reversible oxidation of ethylene on ferroelectric BaTiO3(001): An X-ray photoelectron spectroscopy study. Heliyon. 2024 Jul 23;10(15):e35072. doi: 10.1016/j.heliyon.2024.e35072. PMID: 39157359; PMCID: PMC11328086.
  35. Nagita K, Kamiya K, Nakanishi Sh, Hamamoto Y, Morikawa Y. CO hydrogenation promoted by oxygen atoms adsorbed onto Cu(100). Physical Chemistry C. 2024;128(11):4607-4615. doi: 10.1021/asc.jpcc.4c00666.
  36. Fujishima A, Rao TN, Tryk DA. Titanium dioxide photocatalysis. Photochemistry and photobiology c: photochemistry reviews. 2000;1(1):1-21. doi: 10.1016/S1389-5567(00)00002-2.
  37. Seifikar F, Habibi-Yangjeh A. Floating photocatalysts as promising materials for environmental detoxification and energy production: A review. Chemosphere. 2024 May;355:141686. doi: 10.1016/j.chemosphere.2024.141686. Epub 2024 Mar 19. PMID: 38513952.
  38. Ma Y, Wang M, Zhou X. First-principles investigation of ?-Ge3N4 loaded with ruo2 cocatalysts for photocatalytic overall water splitting. Energy Chemistry. 2020;44(22):24-32. doi: 10.1016/j.jechem.2019.09.013.
  39. Sato J, Saito N, Yamada Y, Maeda K, Takata T, Kondo JN, Hara M, Kobayashi H, Domen K, Inoue Y. RuO2-loaded beta-Ge3N4 as a non-oxide photocatalyst for overall water splitting. J Am Chem Soc. 2005 Mar 30;127(12):4150-1. doi: 10.1021/ja042973v. PMID: 15783179.
  40. Lee Y, Watanabe T, Takata T, Hara M, Yoshimura M, Domen K. Effect of high-pressure ammonia treatment on the activity of Ge3N4 photocatalyst for overall water splitting. J Phys Chem B. 2006 Sep 7;110(35):17563-9. doi: 10.1021/jp063068v. PMID: 16942099.
  41. Maeda K, Domen K. New non-oxide photocatalysts designed for overall water splitting under visible light. Physical Chemistry C. 2007;111:7851-7861. doi: 10.021/jp070911w.
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