Zeolite supported Sn-Pt catalysts prepared by surface reactions

J. L. Margitfalvi, I. Borbáth, G. Vankó, M. Hegedűs, S. Gobölös, A. Vértes

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A Pt/H-mordenite (Pt/H-MOR) catalyst has been modified with tin using the controlled surface reaction between tin tetraalklyls and hydrogen adsorbed on platinum. Experimental evidences show that upon modification of Pt/H-MOR catalyst with tin tetraalkyls, the surface chemistry established for Pt/SiO2 and Pt/Al2O3 cannot be maintained, i.e., the formation of multilayered organometallic complexes (MLOC) is hindered. Consequently, the results indicate that the introduction of tin into platinum is possible if the Sn/Pt(s) ratio is below 0.5. In this case, zeolite supported alloy type Sn-Pt nanoparticles are formed. At higher Sn/Pt(s) ratios, in addition to the formation of alloy type Sn-Pt nanoparticles, ionic forms of tin anchored onto the zeolite are also formed. The reaction between tin tetraalkyls and surface OH groups of the zeolite is involved in the formation of ionic forms of tin stabilized on the zeolite surface. Upon applying Mossbauer spectroscopy, different tin containing surface species were identified including two SnPt alloy phases. Tin introduced in this way slightly decreases the H/Pt and CO/Pt ratios measured by chemisorption and changes the activity and selectivity of these catalysts in n-hexane isomerization at 275 °C. (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)209-226
Number of pages18
JournalJournal of Molecular Catalysis A: Chemical
Volume162
Issue number1-2
DOIs
Publication statusPublished - Nov 20 2000

Fingerprint

Zeolites
Tin
Surface reactions
surface reactions
tin
catalysts
Catalysts
Platinum
platinum
Nanoparticles
nanoparticles
Catalyst selectivity
Mossbauer spectroscopy
Organometallics
Carbon Monoxide
Chemisorption
Isomerization
Surface chemistry
Hexane
chemisorption

Keywords

  • Catalyst modification
  • Modification with tin tetraalkyls
  • Pt/H-mordenite catalysts
  • Sn-Pt/mordenite catalysts
  • Tin tetraethyl
  • Tin tetramethyl

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Zeolite supported Sn-Pt catalysts prepared by surface reactions. / Margitfalvi, J. L.; Borbáth, I.; Vankó, G.; Hegedűs, M.; Gobölös, S.; Vértes, A.

In: Journal of Molecular Catalysis A: Chemical, Vol. 162, No. 1-2, 20.11.2000, p. 209-226.

Research output: Contribution to journalArticle

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AB - A Pt/H-mordenite (Pt/H-MOR) catalyst has been modified with tin using the controlled surface reaction between tin tetraalklyls and hydrogen adsorbed on platinum. Experimental evidences show that upon modification of Pt/H-MOR catalyst with tin tetraalkyls, the surface chemistry established for Pt/SiO2 and Pt/Al2O3 cannot be maintained, i.e., the formation of multilayered organometallic complexes (MLOC) is hindered. Consequently, the results indicate that the introduction of tin into platinum is possible if the Sn/Pt(s) ratio is below 0.5. In this case, zeolite supported alloy type Sn-Pt nanoparticles are formed. At higher Sn/Pt(s) ratios, in addition to the formation of alloy type Sn-Pt nanoparticles, ionic forms of tin anchored onto the zeolite are also formed. The reaction between tin tetraalkyls and surface OH groups of the zeolite is involved in the formation of ionic forms of tin stabilized on the zeolite surface. Upon applying Mossbauer spectroscopy, different tin containing surface species were identified including two SnPt alloy phases. Tin introduced in this way slightly decreases the H/Pt and CO/Pt ratios measured by chemisorption and changes the activity and selectivity of these catalysts in n-hexane isomerization at 275 °C. (C) 2000 Elsevier Science B.V.

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