Effect of HCl on the structure and catalytic activity of Pt/Al2O3 nanocatalyst prepared in microemulsion system

Document Type : Research Article

Authors

1 Department of Chemistry, Faculty of Science, Arak University, Arak, 38156-8-8349, Iran.

2 Department of Chemistry, Faculty of Science, Arak University, Arak, 38156-8-8349, Iran.; Institute of Nanosciences & Nanotechnolgy, Arak University, Arak, 8156-8-8349, Iran

Abstract

Now a day preparation of special and effective nanocatalysts is a hot research topic. Obviously the size and structure of the active site of a catalyst plays the key role in catalytic activity. In this novel research the Pt nanocatalyst supported on γ-Al2O3 was prepared in two different microemulsion systems to clarify the effect of microemulsion essence on catalyst character and activity. Two types of microemulsion systems were constructed from Triton X-100/2-butanol as surfactant and co-surfactant, n-heptane as organic phase and H2O + H2PtCl6 (or HCl(aq) + H2PtCl6) as aqueous phase to investigate the effect of HCl on the shape and structure of the prepared nanocatalysts. Shape, size and size distribution of the Pt nanoparticles on the alumina were monitored by cyclic voltammetry and SEM analysis. Activity of the nanocatalysts was determined by reduction of p-nitrophenol as a reaction model.

Keywords

Main Subjects

References

References:
1. Bennett, C.O. and Che, M. "Some geometric aspects of structure sensitivity", J. Catal., 120, pp. 293-302 (1989).
2. Bond, G.C. "Supported metal catalysts: some unsolved problem", Chem. Soc. Rev., 20, pp. 441-475 (1991).
3. Sanchez-Sanchez, C.M., Solla-Gullon, J., Vidal-Iglesias, F.J., Aldaz, A., Montiel, V., and Herrero, E. "Imaging structure sensitive catalysis on different shape-controlled platinum nanoparticles", J. Am. Chem. Soc., 132, pp. 5622-5624 (2010).
4. Oudar, J. "Hydrogenation reactions on platinum single crystals", Zeitschrift fur Physikalische Chemie, 197, pp. 125-136 (1996).
5. Englisch, M., Jentys, A., and Lercher, J.A. "Structure sensitivity of the hydrogenation of crotonaldehyde over Pt/SiO2 and Pt/TiO2", J. Catal., 166, pp. 25-35 (1997).
6. Kooti, M. and Afshari, M. "Magnetic cobalt ferrite nanoparticles as an efficient catalyst for oxidation of alkenes", Scientia Iranica, F, 19, pp. 1991-1995 (2012). 
7. Miyazaki, A., Balint, I., and Nakano, Y. "Morphology control of platinum nanoparticles and their catalytic properties", J. Nanopart Res., 5, pp. 69-80 (2003).
8. Long, N.V., Ohtaki, M., Hien, T.D., Jalem, R., and Nogami, M. "Synthesis and characterization of polyhedral and quasisphere non-polyhedral Pt nanoparticles: effects of their various surface morphologies and sizes on electrocatalytic activity for fuel cell applications", J. Nanopart Res., 13, pp. 5177-5191 (2011).
9. Long, N.V., Chien, N.D., Hayakawa, T., Matsubara, T., Ohtaki, M., and Nogami, M. "Sharp cubic and octahedral morphologies of poly(vinylpyrrolidone)- stabilised platinum nanoparticles by polyol method in ethylene glycol: their nucleation, growth and formation mechanisms", J. Experimental Nanoscience, 7, pp. 133-149 (2012).
10. Aran-Ais, R.M., Solla-Gullon, J., Herrero, E., and Feliu, J.M. "On the quality and stability of preferentially oriented (100) Pt nanoparticles: An electrochemical insight", J. Electroanal. Chem., 808, pp. 433-438 (2018).
11. Cuenya, B.R. and Behafarid, F. "Nanocatalysis: sizeand shape-dependent chemisorption and catalytic reactivity", Surface Science Reports, 70, pp. 135-187 (2015).
12. Martinez-Rodriguez, R.A., Vidal-Iglesias, F.J., Solla- Gullon, J., Cabrera, C.R., and Feliu, J.M. "Synthesis and electrocatalytic properties of H2SO4-induced (100) Pt nanoparticles prepared in water-in-oil microemulsion", Chem. Phys. Chem., 15, pp. 1997-2001 (2014).
13. Martinez-Rodriguez, R.A., Vidal-Iglesias, F.J., Solla- Gullon, J., Cabrera, C.R., and Feliu, J.M. "Synthesis of Pt nanoparticles in water-in-oil microemulsion: Effect of HCl on their surface structure", J. Am. Chem. Soc., 136, pp. 1280-1283 (2014).
14. Martinez-Rodriguez, R.A., Vidal-Iglesias, F.J., Solla- Gullon, J., Cabrera, C.R., and Feliu, J.M. "Electrochemical characterisation of platinum nanoparticles prepared in a water-in-oil microemulsion in the presence of different modifiers and metal precursors", Chem. Electro. Chem., 3, pp. 1601-1608 (2016).
15. Soleimani, S., Salabat, A., and Tabor, R.F. "Effect of surfactant type on platinum nanoparticle size of composite Pt/ff-Al2O3 catalysts synthesized by a microemulsion method", J. Colloid Interface Sci., 426, pp. 287-292 (2014).
16. Salabat, A. and Soleimani, S. "Ultrasonic irradiation and solvent effects on destabilization of colloidal suspensions of platinum nanoparticles", Particuology, 17, pp. 145-148 (2014).
17. Soleimani, S. and Salabat, A. "Effect of various factors on the Pt nanoparticle size produced in a microemulsion system", Colloid Journal, 77, pp. 207-212 (2015).
18. Pradhan, N., Pal, A., and Pal, T. "Silver nanoparticle catalyzed reduction of aromatic nitro compounds", Colloid Surface A, 196, pp. 247-257 (2002).
19. Vidal-Iglesias, F.J., Aran-Ais, R.M., Solla-Gullon, J., Herrero, E., and Feliu, J.M. "Electrochemical characterization of shape-controlled Pt nanoparticles in different supporting electrolytes", ACS Catalysis, 2, pp. 901-910 (2012).
20. Das, J., Aziz, M.A., and Yang, H. "A nanocatalystbased assay for proteins: DNA-free ultrasensitive electrochemical detection using catalytic reduction of p-nitrophenol by gold-nanoparticle labels", J. Am. Chem. Soc., 128, pp. 16022-16023 (2006).
Scientia Iranica
Volume 26, Issue 3
Transactions on Nanotechnology (F)
May and June 2019
Pages 1925-1930

Files

Cited by

History

  • Receive Date: 29 September 2017
  • Revise Date: 15 January 2018
  • Accept Date: 14 May 2018

Share

How to cite

Statistics