Adsorption of CO and NO on Ceria- and Pt-Supported TiO₂: In Situ FTIR Study

Zeinhom M. El-Bahy

Chemistry Department, Faculty of Science, Taif University, Taif, Saudi Arabia.

DOI: 10.4236/mrc.2013.24019                

Abstract

Pt/TiO₂, Ce/TiO₂ and binary system PtCe/TiO₂ catalysts were prepared by impregnation method and the structural properties of these catalysts were investigated by means of XRD, CO-TPD and UV-vis diffuse reflectance spectroscopy. As investigated by XRD, the composition of the prepared samples anatase and rutile phases with higher amount of anatase phase and its particle size was in the range of 19 - 22 nm. The band gap also decreased from 3.1 to 2.85 after addition of metal to TiO₂. The adsorption and interaction properties of NO and/or CO gases were monitored using an in situ FTIR technique. The intensity and position of the infrared peaks were strongly dependent on the composition of the catalyst. In presence of Pt, the main oxidative reductive products of (NO + CO) are CO₂ and NCO complex. The formation of NCO depends on not only the presence of platinum in the catalyst but also the presence of Lewis acid sites which is Ti⁴⁺ in this study. However, the interaction between NO and CO gases increased in presence of CeO₂. The optimum Ce content in PtCe/TiO₂ was 0.1% (Ce/TiO₂) at which the maximum peak intensity was observed for NCO and CO₂.

Keywords

In Situ FTIR; NO Reduction; CO Oxidation; TPD-CO; Platinum-Cerium

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	J. Beheshtian, M. Kamfiroozi, Z. Bagheri and A. Ahmadi, “Computational Study of CO and NO Adsorption on Magnesium Oxide Nanotubes,” Physica E, Vol. 44, No. 3, 2011, pp. 546-549. http://dx.doi.org/10.1016/j.physe.2011.09.016
[2]	B. Z. Sun, W. K. Chen, J. D. Zheng and C. H. Lu, “Roles of Oxygen Vacancy in the Adsorption Properties of CO and NO on Cu2O(1 1 1) Surface: Results of a First-Principles Study,” Applied Surface Science, Vol. 255, No. 5, 2008, pp. 3141-3148. http://dx.doi.org/10.1016/j.apsusc.2008.09.005
[3]	R. L. Keiski, M. Harkonen, A. Lahti, T. Maunula, A. Savimaki and T. Slotte, “An Infrared Study of CO and NO Adsorption on Pt, Rh, Pd 3-Way Catalysts, Catalysis and Automotive Pollution Control III,” Studies in Surface Science and Catalysis, Vol. 96, 1995, pp. 85-95. http://dx.doi.org/10.1016/S0167-2991(06)81421-7
[4]	E. Ivanova, M. Mihaylov, F. Thibault-Starzyk, M. Daturi and K. Hadjiivanov, “FTIR Spectroscopy Study of CO and NO Adsorption and Co-Adsorption on Pt/TiO2,” Journal of Molecular Catalysis A, Vol. 274, No. 1-2, 2007, pp. 179-184. http://dx.doi.org/10.1016/j.molcata.2007.05.006
[5]	E. Guglielminotti and F. Boccuzzi, “Spectroscopic Characterization of the CeO2/TiO2 and Rh-CeO2/TiO2 Systems: CO Adsorption and NO-CO, NO-C3H8 Reactions,” Journal of Molecular Catalysis A, Vol. 104, No. 3, 1996, pp. 273-283. http://dx.doi.org/10.1016/1381-1169(95)00180-8
[6]	I. D. González, R. M. Navarro, W. Wen, N. Marinkovic, J. A. Rodrigué, F. Rosa and J. L. G. Fierro, “A Comparative Study of the Water Gas Shift Reaction over Platinum Catalysts Supported on CeO2, TiO2 and Ce-Modified TiO2,” Catalysis Today, Vol. 149, No. 3-4, 2010, pp. 372-379. http://dx.doi.org/10.1016/j.cattod.2009.07.100
[7]	I. Malpartida, E. Ivanova, M. Mihaylov, K. Hadjiivanov, V. Blasin-Aube, O. Marie and M. Daturi, “CO and NO Adsorption for the IR Characterization of Fe2+ Cations in Ferrierite: An Efficient Catalyst for NOx SCR with NH3 as Studied by Operando IR Spectroscopy,” Catalysis Today, Vol. 149, No. 3-4, 2010, pp. 295-303. http://dx.doi.org/10.1016/j.cattod.2009.09.015
[8]	P. Klug and L. E. Alexander, “Direction Procedures for Polycrystalline and Amorphous Materials,” Wiley, New York, 1954.
[9]	Q. H. Zhang, L. Gao and J. K. Guo, “Effects of Calcination on the Photocatalytic Properties of Nanosized TiO2 Powders Prepared by TiCl4 Hydrolysis,” Applied Catalysis B, Vol. 26, No. 3, 2000, pp. 207-215. http://dx.doi.org/10.1016/S0926-3373(00)00122-3
[10]	L. Q. Jing, X. J. Sun, B. F. Xin, B. Q. Wang, W. M. Cai and H. G. Fu, “The Preparation and Characterization of La Doped TiO2 Nanoparticles and Their Photocatalytic Activity,” Journal of Solid State Chemistry, Vol. 177, No. 10, 2004, pp. 3375-3382. http://dx.doi.org/10.1016/j.jssc.2004.05.064
[11]	A. Torncrona, M. Skoglundh, P. Thormahlen, E. Fridell and E. Jobson, “Low Temperature Catalytic Activity of Cobalt Oxide and Ceria Promoted Pt and Pd: Influence of Pretreatment and Gas Composition,” Applied Catalysis B, Vol. 14, No. 1-2, 1997, pp. 131-145. http://dx.doi.org/10.1016/S0926-3373(97)00018-0
[12]	Z. Jiang, W. Huang, H. Zhao, Z. Zhang, D. Tan and X. Bao, “Dispersion and Site-Blocking Effect of Molybdenum Oxide for CO Chemisorption on the Pt(1 1 0) Substrate,” Journal of Molecular Catalysis A, Vol. 268, No. 1-2, 2007, pp. 213-220. http://dx.doi.org/10.1016/j.molcata.2006.12.024
[13]	C. Te Hsieh, W. S. Fan, W. Y. Chen and J. Y. Lin, “Adsorption and Visible-Light-Derived Photocatalytic Kinetics of Organic Dye on Co-Doped Titania Nanotubes Prepared by Hydrothermal Synthesis,” Separation and Purification Technology, Vol. 67, No. 3, 2009, pp. 312-318. http://dx.doi.org/10.1016/j.seppur.2009.03.041
[14]	W. Y. Teoh, R. Amal, L. Madler and S. E. Pratsinis, “Flame Sprayed Visible Light Active Fe-TiO2 for Photomineralisation of Oxalic Acid,” Catalysis Today, Vol. 120, No. 2, 2007, pp. 203-213. http://dx.doi.org/10.1016/j.cattod.2006.07.049
[15]	M. Mihaylov, K. Chakarova and K. Hadjiivanov, “Formation of Carbonyl and Nitrosyl Complexes on Titaniaand Zirconia-Supported Nickel: FTIR Spectroscopy Study,” Journal of Catalysis, Vol. 228, No. 2, 2004, pp. 273-281. http://dx.doi.org/10.1016/j.jcat.2004.08.039
[16]	I. Tankov, W. H. Cassinelli, J. M. C. Bueno, K. Arishtirova and S. Damyanova, “DRIFTS Study of CO Adsorption on Praseodymium Modified Pt/Al2O3,” Applied Surface Science, Vol. 259, 2012, pp. 831-839. http://dx.doi.org/10.1016/j.apsusc.2012.07.138
[17]	K. Pokrovski, K. T. Jung and A. T. Bell, “Investigation of CO and CO2 Adsorption on Tetragonal and Monoclinic Zirconia,” Langmuir, Vol. 17, No. 14, 2001, pp. 4297-4303. http://dx.doi.org/10.1021/la001723z
[18]	Z. M. El-Bahy, A. I. Hanafy, M. M. Ibrahim and M. Anpo, “In Situ FTIR Studies of CO Oxidation over Fe-Free and Fe-Promoted PtY Catalysts: Effect of Water Vapor Addition,” Journal of Molecular Catalysis A, Vol. 344, No. 1-2, 2011, pp. 111-121. http://dx.doi.org/10.1016/j.molcata.2011.05.008
[19]	S. D. Ebbesen, B. L. Mojet and L. Lefferts, “In Situ ATR-IR Study of CO Adsorption and Oxidation over Pt/Al2O3 in Gas and Aqueous Phase: Promotion Effects by Water and pH,” Journal of Catalysis, Vol. 246, No. 1, 2007, pp. 66-73. http://dx.doi.org/10.1016/j.jcat.2006.11.019
[20]	K. Kinoshita, “Carbon, Electrochemical and Physical Properties,” Wiley, New York, 1988.
[21]	F. Bozon-Verduraz and A. Bensalem, “IR Studies of Cerium Dioxide: Influence of Impurities and Defects,” Journal of the Chemical Society, Faraday Transactions, Vol. 90, No. 4, 1994, pp. 653-657. http://dx.doi.org/10.1039/ft9949000653
[22]	C. Shengzhou, H. Zou, Z. Liu and W. Lin, “DRIFTS Study of Different Gas Adsorption for CO Selective Oxidation on Cu-Zr-Ce-O Catalysts,” Applied Surface Science, Vol. 255, No. 15, 2009, pp. 6963-6967. http://dx.doi.org/10.1016/j.apsusc.2009.03.021
[23]	D. B. Akolekar and S. K. Bhargava, “Adsorption of NO and CO on Silver-Exchanged Microporous Materials,” Journal of Molecular Catalysis A, Vol. 157, No. 1-2, 2000, pp. 199-206. http://dx.doi.org/10.1016/S1381-1169(00)00055-8
[24]	Q. Yu, L. Liu, L. Dong, D. Li, B. Liu, F. Gao, K. Sun, L. Dong and Y. Chen, “Effects of Ce/Zr Ratio on the Reducibility, Adsorption and Catalytic Activity of CuO/ CexZr1ixO2/γ-Al2O3 Catalysts for NO Reduction by CO,” Applied Catalysis B, Vol. 96, No. 3-4, 2010, pp. 350-360. http://dx.doi.org/10.1016/j.apcatb.2010.02.032
[25]	T. Nakatsuji, T. Yamaguchi, N. Sato and H. Ohno, “A Selective NOx Reduction on Rh-Based Catalysts in Lean Conditions Using CO as a Main Reductant,” Applied Catalysis B, Vol. 85, No. 1-2, 2008, pp. 61-70. http://dx.doi.org/10.1016/j.apcatb.2008.06.024
[26]	B. Azambre, L. Zenboury, F. Delacroix and J. V. Weber, “Adsorption of NO and NO2 on Ceria-Zirconia of Composition Ce0.69Zr0.31O2: A DRIFTS Study,” Catalysis Today, Vol. 137, No. 2-4, 2008, pp. 278-282. http://dx.doi.org/10.1016/j.apcatb.2008.06.024
[27]	C. Morterra and G. Magnacca, “A Case Study: Surface Chemistry and Surface Structure of Catalytic Aluminas, as Studied by Vibrational Spectroscopy of Adsorbed Species,” Catalysis Today, Vol. 27, No. 3-4, 1996, pp. 497-532. http://dx.doi.org/10.1016/0920-5861(95)00163-8
[28]	K. I. Hadjiivanov and G. N. Vayssilov, “Characterization of Oxide Surfaces and Zeolites by Carbon Monoxide as an IR Probe Molecule,” Advances in Catalysis, Vol. 47, 2002, pp. 307-511. http://dx.doi.org/10.1016/0920-5861(95)00163-8
[29]	O. S. Alexeev, S. Krishnamoorthy, C. Jensen, M. S. Ziebarth, G. Yaluris, T. G. Roberie and M. D. Amiridis, “In Situ FTIR Characterization of the Adsorption of CO and Its Reaction with NO on Pd-Based FCC Low NOx Combustion Promoters,” Catalysis Today, Vol. 127, No. 1-4, 2007, pp. 189-198. http://dx.doi.org/10.1016/j.cattod.2007.05.003
[30]	F. Solymosi and T. Bansagi, “Infrared Spectroscopic Study of the Isocyanate Surface Complex over Cu-ZSM-5 Catalysts,” Journal of Catalysis, Vol. 156, No. 1, 1995, pp. 75-84. http://dx.doi.org/10.1006/jcat.1995.1233
[31]	R. Dumpelmann, N. W. Cant and D. L. Trimm, “Formation of Isocyanic Acid during the Reaction of Mixtures of NO, CO and H2 over Supported Platinum Catalysts,” Applied Catalysis B, Vol. 6, No. 4, 1995, pp. L291-L296. http://dx.doi.org/10.1016/0926-3373(95)00024-0
[32]	A. M. Sica and C. E. Giola, “Interaction of CO, NO and NO/CO over Pd/γ-Al2O3 and Pd-WOx/γ-Al2O3 Catalysts,” Applied Catalysis A, Vol. 239, No. 1-2, 2003, pp. 121-139. http://dx.doi.org/10.1016/S0926-860X(02)00380-0
[33]	R. Di Monte, J. Kaspar, P. Fornasiero, M. Graziani, C. Pazéand and G. Gubitosa, “NO Reduction by CO over Pd/Ce0.6Zr0.4O2/Al2O3 Catalysts: In Situ FT-IR Studies of NO and CO Adsorption,” Inorganica Chimica Acta, Vol. 334, 2002, pp. 318-326. http://dx.doi.org/10.1016/S0020-1693(02)00800-9
[34]	H. Arai and H. Tominaga, “An Infrared Study of Nitric Oxide Adsorbed on Rhodium-Alumina Catalyst,” Journal of Catalysis, Vol. 43, No. 1-3, 1976, pp. 131-142. http://dx.doi.org/10.1016/0021-9517(76)90300-6
[35]	L. Liu, B. Liu, L. Dong, J. Zhu, H. Wan, K. Sun, B. Zhao, H. Zhu, L. Dong and Y. Chen, “In Situ FT-Infrared Investigation of CO or/and NO Interaction with CuO/ Ce0.67Zr0.33O2 Catalysts,” Applied Catalysis B, Vol. 90, No. 3-4, 2009, pp. 578-586. http://dx.doi.org/10.1016/j.apcatb.2009.04.019
[36]	K. Chakarova, M. Mihaylov and K. Hadjiivaniov, “FTIR Spectroscopic Study of CO Adsorption on Pt-H-ZSM-5,” Microporous and Mesoporous Materials, Vol. 81, No. 1-3, 2005, pp. 305-312. http://dx.doi.org/10.1016/j.micromeso.2005.01.033
[37]	K. Chakarova, M. Mihaylov and K. Hadjiivaniov, “Poly- carbonyl Species in Pt/H-ZSM-5: FTIR Spectroscopic Study of 12CO-13CO Co-Adsorption,” Catalysis Communications, Vol. 6, No. 7, 2005, pp. 466-471. http://dx.doi.org/10.1016/j.catcom.2005.04.007
[38]	K. Chakarova, K. Hadjiivanov, G. Atanasova and K. Tenchev, “Effect of Preparation Technique on the Properties of Platinum in NaY Zeolite: A Study by FTIR Spectroscopy of Adsorbed CO,” Journal of Molecular Catalysis A, Vol. 264, No. 1-2, 2007, pp. 270-279. http://dx.doi.org/10.1016/j.molcata.2006.09.040
[39]	S. H. Oh and C. C. Eickel, “Influence of Metal Particle Size and Support on the Catalytic Properties of Supported Rhodium: CO+O2 and CO+NO Reactions,” Journal of Catalysis, Vol. 128, No. 2, 1991, pp. 526-536. http://dx.doi.org/10.1016/0021-9517(91)90310-Z
[40]	S. H. Oh, “Effects of Cerium Addition on the CO+NO Reaction Kinetics over Alumina-Supported Rhodium Catalysts,” Journal of Catalysis, Vol. 124, No. 2, 1990, pp. 477-487. http://dx.doi.org/10.1016/0021-9517(90)90194-O
[41]	M. Paulis, H. Peyrard and M. Montes, “Influence of Chlorine on the Activity and Stability of Pt/Al2O3 Catalysts in the Complete Oxidation of Toluene,” Journal of Catalysis, Vol. 199, No. 1, 2001, pp. 30-40. http://dx.doi.org/10.1006/jcat.2000.3146
[42]	T. M. Salama, Z. M. El-Bahy and F. I. Zidan, “Aqueous H2O2 as an Oxidant for CO over Ptand Au-NaY Catalysts,” Journal of Molecular Catalysis A, Vol. 264, No. 1-2, 2007, pp. 128-134. http://dx.doi.org/10.1016/j.molcata.2006.08.003
[43]	A. Parinyaswan, S. Pongstabodee and A. Luengnaruemitchai, “Catalytic Performances of Pt-Pd/CeO2 Catalysts for Selective CO Oxidation,” International Journal of Hydrogen Energy, Vol. 31, No. 13, 2006, pp. 1942-1949. http://dx.doi.org/10.1016/j.ijhydene.2006.05.002
[44]	S. D. Ebbesen, B. L. Mojet and L. Lefferts, “In situ ATR-IR Study of CO Adsorption and Oxidation over Pt/Al2O3 in Gas and Aqueous Phase: Promotion Effects by Water and pH,” Journal of Catalysis, Vol. 246, No. 1, 2007, pp. 66-73. http://dx.doi.org/10.1016/j.jcat.2006.11.019