Electron Paramagnetic Resonance Study of Catalysts Derived from Molybdenum Hexacarbonyl

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Abstract
E.p.r. spectroscopy has been used to study supported molybdenum hexacarbonyl olefin dispproportionation catalysts. Activation of silica and alumina supported catalysts causes the appearance of a signal attributed to molybdenum(V) in square pyramidal co-ordination. Exposure of activated catalysts to oxygen gives a signal due to O, probably formed by electron transfer from tetrahedrally co-ordinated molybdenum(V). A second strongly adsorbed O species obtained on alumina supported catalysts is associated with exposed aluminium ions in the support. The square pyramidal molybdenum(V) species cannot be correlated with the activity of the catalysts for propene disproportionation, and it is suggested that the active species is a precursor of the tetrahedral molybdenum(V), possibly molybdenum(IV).
Original languageEnglish
Pages (from-to)1967-1977
Number of pages11
JournalJournal of the Chemical Society, Faraday Transactions
Volume69
Issue number11
DOIs
Publication statusPublished - 1 Jun 1973

Cite this

Electron Paramagnetic Resonance Study of Catalysts Derived from Molybdenum Hexacarbonyl. / Howe, Russell Francis; Leith, I R .

In: Journal of the Chemical Society, Faraday Transactions, Vol. 69, No. 11, 01.06.1973, p. 1967-1977.

Research output: Contribution to journalArticle

@article{c1f61ff5c37741b5aeea780a53885540,
title = "Electron Paramagnetic Resonance Study of Catalysts Derived from Molybdenum Hexacarbonyl",
abstract = "Abstract E.p.r. spectroscopy has been used to study supported molybdenum hexacarbonyl olefin dispproportionation catalysts. Activation of silica and alumina supported catalysts causes the appearance of a signal attributed to molybdenum(V) in square pyramidal co-ordination. Exposure of activated catalysts to oxygen gives a signal due to O, probably formed by electron transfer from tetrahedrally co-ordinated molybdenum(V). A second strongly adsorbed O species obtained on alumina supported catalysts is associated with exposed aluminium ions in the support. The square pyramidal molybdenum(V) species cannot be correlated with the activity of the catalysts for propene disproportionation, and it is suggested that the active species is a precursor of the tetrahedral molybdenum(V), possibly molybdenum(IV).",
author = "Howe, {Russell Francis} and Leith, {I R}",
year = "1973",
month = "6",
day = "1",
doi = "10.1039/F19736901967",
language = "English",
volume = "69",
pages = "1967--1977",
journal = "Journal of the Chemical Society, Faraday Transactions",
issn = "0300-9599",
publisher = "Faraday Division of the Chemical Society",
number = "11",

}

TY - JOUR

T1 - Electron Paramagnetic Resonance Study of Catalysts Derived from Molybdenum Hexacarbonyl

AU - Howe, Russell Francis

AU - Leith, I R

PY - 1973/6/1

Y1 - 1973/6/1

N2 - Abstract E.p.r. spectroscopy has been used to study supported molybdenum hexacarbonyl olefin dispproportionation catalysts. Activation of silica and alumina supported catalysts causes the appearance of a signal attributed to molybdenum(V) in square pyramidal co-ordination. Exposure of activated catalysts to oxygen gives a signal due to O, probably formed by electron transfer from tetrahedrally co-ordinated molybdenum(V). A second strongly adsorbed O species obtained on alumina supported catalysts is associated with exposed aluminium ions in the support. The square pyramidal molybdenum(V) species cannot be correlated with the activity of the catalysts for propene disproportionation, and it is suggested that the active species is a precursor of the tetrahedral molybdenum(V), possibly molybdenum(IV).

AB - Abstract E.p.r. spectroscopy has been used to study supported molybdenum hexacarbonyl olefin dispproportionation catalysts. Activation of silica and alumina supported catalysts causes the appearance of a signal attributed to molybdenum(V) in square pyramidal co-ordination. Exposure of activated catalysts to oxygen gives a signal due to O, probably formed by electron transfer from tetrahedrally co-ordinated molybdenum(V). A second strongly adsorbed O species obtained on alumina supported catalysts is associated with exposed aluminium ions in the support. The square pyramidal molybdenum(V) species cannot be correlated with the activity of the catalysts for propene disproportionation, and it is suggested that the active species is a precursor of the tetrahedral molybdenum(V), possibly molybdenum(IV).

U2 - 10.1039/F19736901967

DO - 10.1039/F19736901967

M3 - Article

VL - 69

SP - 1967

EP - 1977

JO - Journal of the Chemical Society, Faraday Transactions

JF - Journal of the Chemical Society, Faraday Transactions

SN - 0300-9599

IS - 11

ER -