Hydrogenation of benzonitrile on Sn-Pt/SiO2 Catalysts prepared by introducing SnEt4 to Pt/SiO2: Role of TIN

Sándor Gobölös, Nagen Mahata, I. Borbáth, M. Hegedűs, József L. Margitfalvi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Liquid phase hydrogenation of benzonitrile was studied over Sn-Pt/SiO2 catalysts prepared by introducing tetraethyl tin onto the 3 wt.% Pt/SiO2 catalyst. Tin content of the catalysts ranged from 0.05 to 0.63 wt.%, whereas Sn/Pt surface atomic ratios determined by chemisorption measurements were between 0.1 to 3.5. Dibenzylamine selectivity influenced to a small extent by the level of conversion and the Sn/Pt ratio was ca. 75 %. The addition of tin to Pt in the range of (Sn/Pt)surface = 0.50-1.25 led to an increase in the turnover frequency (TOF) by a factor of 2. TOF showed a maximum at a surface atomic ratio of Sn/Pt = 1. The enhancement of catalyst activity upon the addition of tin is explained by the formation of Snδ+-Pt ensemble sites on the surface of bimetallic nanoclusters. It is suggested that highly dispersed positively charged tin species, by polarizing the triple bond, enhance the reactivity of the -CN group. Calcination at 300°C followed by re-reduction of the catalysts resulted in a monotonic decrease of specific activity with increasing Sn/Pt ratio.

Original languageEnglish
Pages (from-to)345-352
Number of pages8
JournalReaction Kinetics and Catalysis Letters
Volume74
Issue number2
DOIs
Publication statusPublished - 2001

Fingerprint

Tin
Hydrogenation
hydrogenation
tin
catalysts
Catalysts
Nanoclusters
Chemisorption
Calcination
Catalyst activity
nanoclusters
roasting
chemisorption
liquid phases
reactivity
selectivity
benzonitrile
Liquids
augmentation

Keywords

  • Benzonitrile
  • Hydrogenation
  • Sn-Pt/SiO catalyst

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Cite this

Hydrogenation of benzonitrile on Sn-Pt/SiO2 Catalysts prepared by introducing SnEt4 to Pt/SiO2 : Role of TIN. / Gobölös, Sándor; Mahata, Nagen; Borbáth, I.; Hegedűs, M.; Margitfalvi, József L.

In: Reaction Kinetics and Catalysis Letters, Vol. 74, No. 2, 2001, p. 345-352.

Research output: Contribution to journalArticle

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