Formation of multilayered tin organometallic surface species. Preparation of new type of supported Sn-Pt catalysts

József L. Margitfalvi, I. Borbáth, E. Tfirst, A. Tompos

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

In this study, a new aspect of anchoring of tin organic moieties onto platinum is described and discussed. The new approach resulted in substantial increase of the Sn/Pt ratio in tin modified Pt/SiO2 catalysts. In the earlier approach, adsorbed hydrogen was exclusively used for tin anchoring, resulting in a monolayer of tin organic moieties at the top of platinum. In the new approach, a large excess of either tin tetraethyl or hydrogen was used in the tin-anchoring reaction. The presence of coadsorbents, such as oxygen, also led to a substantial increase of the amount of tin anchored. When the primary formed -SnR3 surface entities were partially decomposed, the coordinatively formed unsaturated -SnR2 and -SnR surface species provided additional anchoring sites for the next layer of SnR4. In the presence of adsorbed oxygen, additional new types of landing sites were created to anchor SnR4 in the neighborhood of platinum. The above approach resulted in Sn-Pt/SiO2 catalysts with exclusive tin-platinum interaction and an Sn/Pt ratio ca. 2. Results obtained in this study also reveal that the formation of surface organometallic moieties takes place in a stepwise way, e.g. the buildup of tin organic moieties occurs layer-by-layer. The supported Sn-Pt bimetallic entities formed showed both high activity and selectivity in the hydrogenation of crotonaldehyde to crotylalcohol.

Original languageEnglish
Pages (from-to)29-49
Number of pages21
JournalCatalysis Today
Volume43
Issue number1-2
Publication statusPublished - Aug 13 1998

Fingerprint

Tin
Organometallics
Catalysts
Platinum
2-butenal
Hydrogen
Oxygen
Landing
Anchors
Hydrogenation
Monolayers

Keywords

  • Catalyst modification
  • Controlled surface reactions
  • Formation of crotylalcohol
  • Hydrogenation of crotonaldehyde
  • Pt/SiO catalyst
  • Sn-Pt/SiO catalyst
  • Surface organometallic chemistry
  • Tin tetraethyl

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Formation of multilayered tin organometallic surface species. Preparation of new type of supported Sn-Pt catalysts. / Margitfalvi, József L.; Borbáth, I.; Tfirst, E.; Tompos, A.

In: Catalysis Today, Vol. 43, No. 1-2, 13.08.1998, p. 29-49.

Research output: Contribution to journalArticle

@article{53e7111495a340cf80581e213681c296,
title = "Formation of multilayered tin organometallic surface species. Preparation of new type of supported Sn-Pt catalysts",
abstract = "In this study, a new aspect of anchoring of tin organic moieties onto platinum is described and discussed. The new approach resulted in substantial increase of the Sn/Pt ratio in tin modified Pt/SiO2 catalysts. In the earlier approach, adsorbed hydrogen was exclusively used for tin anchoring, resulting in a monolayer of tin organic moieties at the top of platinum. In the new approach, a large excess of either tin tetraethyl or hydrogen was used in the tin-anchoring reaction. The presence of coadsorbents, such as oxygen, also led to a substantial increase of the amount of tin anchored. When the primary formed -SnR3 surface entities were partially decomposed, the coordinatively formed unsaturated -SnR2 and -SnR surface species provided additional anchoring sites for the next layer of SnR4. In the presence of adsorbed oxygen, additional new types of landing sites were created to anchor SnR4 in the neighborhood of platinum. The above approach resulted in Sn-Pt/SiO2 catalysts with exclusive tin-platinum interaction and an Sn/Pt ratio ca. 2. Results obtained in this study also reveal that the formation of surface organometallic moieties takes place in a stepwise way, e.g. the buildup of tin organic moieties occurs layer-by-layer. The supported Sn-Pt bimetallic entities formed showed both high activity and selectivity in the hydrogenation of crotonaldehyde to crotylalcohol.",
keywords = "Catalyst modification, Controlled surface reactions, Formation of crotylalcohol, Hydrogenation of crotonaldehyde, Pt/SiO catalyst, Sn-Pt/SiO catalyst, Surface organometallic chemistry, Tin tetraethyl",
author = "Margitfalvi, {J{\'o}zsef L.} and I. Borb{\'a}th and E. Tfirst and A. Tompos",
year = "1998",
month = "8",
day = "13",
language = "English",
volume = "43",
pages = "29--49",
journal = "Catalysis Today",
issn = "0920-5861",
publisher = "Elsevier",
number = "1-2",

}

TY - JOUR

T1 - Formation of multilayered tin organometallic surface species. Preparation of new type of supported Sn-Pt catalysts

AU - Margitfalvi, József L.

AU - Borbáth, I.

AU - Tfirst, E.

AU - Tompos, A.

PY - 1998/8/13

Y1 - 1998/8/13

N2 - In this study, a new aspect of anchoring of tin organic moieties onto platinum is described and discussed. The new approach resulted in substantial increase of the Sn/Pt ratio in tin modified Pt/SiO2 catalysts. In the earlier approach, adsorbed hydrogen was exclusively used for tin anchoring, resulting in a monolayer of tin organic moieties at the top of platinum. In the new approach, a large excess of either tin tetraethyl or hydrogen was used in the tin-anchoring reaction. The presence of coadsorbents, such as oxygen, also led to a substantial increase of the amount of tin anchored. When the primary formed -SnR3 surface entities were partially decomposed, the coordinatively formed unsaturated -SnR2 and -SnR surface species provided additional anchoring sites for the next layer of SnR4. In the presence of adsorbed oxygen, additional new types of landing sites were created to anchor SnR4 in the neighborhood of platinum. The above approach resulted in Sn-Pt/SiO2 catalysts with exclusive tin-platinum interaction and an Sn/Pt ratio ca. 2. Results obtained in this study also reveal that the formation of surface organometallic moieties takes place in a stepwise way, e.g. the buildup of tin organic moieties occurs layer-by-layer. The supported Sn-Pt bimetallic entities formed showed both high activity and selectivity in the hydrogenation of crotonaldehyde to crotylalcohol.

AB - In this study, a new aspect of anchoring of tin organic moieties onto platinum is described and discussed. The new approach resulted in substantial increase of the Sn/Pt ratio in tin modified Pt/SiO2 catalysts. In the earlier approach, adsorbed hydrogen was exclusively used for tin anchoring, resulting in a monolayer of tin organic moieties at the top of platinum. In the new approach, a large excess of either tin tetraethyl or hydrogen was used in the tin-anchoring reaction. The presence of coadsorbents, such as oxygen, also led to a substantial increase of the amount of tin anchored. When the primary formed -SnR3 surface entities were partially decomposed, the coordinatively formed unsaturated -SnR2 and -SnR surface species provided additional anchoring sites for the next layer of SnR4. In the presence of adsorbed oxygen, additional new types of landing sites were created to anchor SnR4 in the neighborhood of platinum. The above approach resulted in Sn-Pt/SiO2 catalysts with exclusive tin-platinum interaction and an Sn/Pt ratio ca. 2. Results obtained in this study also reveal that the formation of surface organometallic moieties takes place in a stepwise way, e.g. the buildup of tin organic moieties occurs layer-by-layer. The supported Sn-Pt bimetallic entities formed showed both high activity and selectivity in the hydrogenation of crotonaldehyde to crotylalcohol.

KW - Catalyst modification

KW - Controlled surface reactions

KW - Formation of crotylalcohol

KW - Hydrogenation of crotonaldehyde

KW - Pt/SiO catalyst

KW - Sn-Pt/SiO catalyst

KW - Surface organometallic chemistry

KW - Tin tetraethyl

UR - http://www.scopus.com/inward/record.url?scp=0001881257&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001881257&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0001881257

VL - 43

SP - 29

EP - 49

JO - Catalysis Today

JF - Catalysis Today

SN - 0920-5861

IS - 1-2

ER -