Abstract
Original language | English |
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Pages (from-to) | 1689-1696 |
Number of pages | 8 |
Journal | Journal of the Chemical Society, Faraday Transactions |
Volume | 71 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Jan 1975 |
Cite this
Electron paramagnetic resonance studies of some supported organometallic catalysts. / Howe, Russell Francis.
In: Journal of the Chemical Society, Faraday Transactions, Vol. 71, No. 1, 01.01.1975, p. 1689-1696.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Electron paramagnetic resonance studies of some supported organometallic catalysts
AU - Howe, Russell Francis
PY - 1975/1/1
Y1 - 1975/1/1
N2 - E.p.r. spectroscopy has been used to study catalysts obtained by supporting the following complexes on high surface area silica: Mo2(CH3CO2)4, M2[CH2Si(CH3)3]6(M = Mo or W), W(CO)6, W(CH3)6, Cr(CO)6, Cr[CH2C(CH3)3]4. The supported molybdenum complexes activated at sufficiently high temperatures give rise to e.p.r. signals identical to those observed previously from silica supported Mo(CO)6 and MoO3 catalysts, due to MoV in square pyramidal co-ordination, and O formed by interaction of O2 with tetrahedrally coordinated MoV. The supported tungsten complexes give only an O signal on exposure to O2. The spectrum of adsorbed CH3 radicals is detected during decomposition of supported W(CH3)6. The supported chromium complexes activated in vacuo and exposed to O2 give CrV signals identical to those observed from silica supported CrO3. The catalytic implications of these observations are discussed.
AB - E.p.r. spectroscopy has been used to study catalysts obtained by supporting the following complexes on high surface area silica: Mo2(CH3CO2)4, M2[CH2Si(CH3)3]6(M = Mo or W), W(CO)6, W(CH3)6, Cr(CO)6, Cr[CH2C(CH3)3]4. The supported molybdenum complexes activated at sufficiently high temperatures give rise to e.p.r. signals identical to those observed previously from silica supported Mo(CO)6 and MoO3 catalysts, due to MoV in square pyramidal co-ordination, and O formed by interaction of O2 with tetrahedrally coordinated MoV. The supported tungsten complexes give only an O signal on exposure to O2. The spectrum of adsorbed CH3 radicals is detected during decomposition of supported W(CH3)6. The supported chromium complexes activated in vacuo and exposed to O2 give CrV signals identical to those observed from silica supported CrO3. The catalytic implications of these observations are discussed.
U2 - 10.1039/F19757101689
DO - 10.1039/F19757101689
M3 - Article
VL - 71
SP - 1689
EP - 1696
JO - Journal of the Chemical Society, Faraday Transactions
JF - Journal of the Chemical Society, Faraday Transactions
SN - 0300-9599
IS - 1
ER -