- Partially decomposed catalyst and hydrocarbon oxidation processes using the same
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The present invention is related to a hydrocarbon oxidation process. The process comprises bringing one or more hydrocarbons into contact with a source of oxygen in the presence of a radical initiator and a catalyst. The catalyst comprises an organic metal complex located on a catalyst support, and is obtained by partial decomposition of the organic metal complex. For example, the process can be used to produce dimethyl carbonate from dimethoxy methane. The invention is also related to a partially decomposed catalyst that comprises a silica support and an organic metal complex, wherein at least 5% of the organic compound remains in the catalyst. The organic metal complex comprises an organic compound and a metal-based compound wherein the metal is selected from copper, nickel, and combinations thereof. The invention is also related to a process for manufacturing of a catalyst comprising mixing L-arginine, a Cu-based compound, water, and optionally another metal-based compound to form a solution; impregnating the solution onto a silica support to form a catalyst precursor; and partially decomposing the L-arginine to form the catalyst so that at least 5% of L-arginine remains in the catalyst.
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Page/Page column 5
(2008/06/13)
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- Mechanisms for the chlorine atom initiated oxidation of dimethoxymethane and 1,2-dimethoxyethane in the presence of NO(x)
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The chlorine atom initiated gas-phase oxidations of dimethoxymethane and 1,2-dimethoxyethane, have been investigated in the presence of NO(x). Methoxymethyl formate and dimethyl carbonate were identified as the oxidation products of dimethoxymethane with molar yields of 0.72 ± 0.05 and 0.26 ± 0.02 respectively. The oxidation products of 1,2-dimethoxyethane were methyl formate (1.51 ± 0.16) and methoxyethyl formate (O.11 ± 0.01). The results of these studies are used to elucidate simplified gas-phase atmospheric degradation schemes for the diethers and also provide valuable information on the atmospheric fate of the alkoxy radicals produced in these and similar reactions.
- Wenger,Porter,Collins,Treacy,Sidebottom
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p. 1197 - 1204
(2007/10/03)
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- CH3OCH.+, a New Stable C2H4O.+ Isomer, and a Reassessment of the Oxirane.+ Potential Surface
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The .+ isomer of structure .+ has been shown to be unambiguously generated by CO2 loss from ionized methyl glyoxylate. ΔHf0 for this new ion was measured to be 224 +/- 1 kcal mol-1.The .+ ion produced by the loss of CH2O from ionized 1,3-dioxolane and by the loss of HCOOH from ionized methoxymethyl formate was proposed to have the structure .+, ΔHf0 = 206 +/- 2 kcal mol-1.Ionized oxirane in either its 2B1 or 2A1 state was proposed to be generated by loss of CO2 from ionized ethylene carbonate at a threshold energy corresponding to a ΔHf0 = 235 +/- 1 kcal mol-1.The structure assignments were aided by observations of collisional activation and metastable ion mass spectra.The common fragmentations of .+ and .+ ions, loss of CH3. and H., take place at similar high internal energies, leading to large kinetic energy releases in the metastable ion decompositions.Interpretations of the observations were in keeping with recent high-level ab initio molecular orbital theory calculations, but detailed mechanisms could not be established.
- Buschek, J. M.,Holmes, J. L.,Terlouw, J. K.
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p. 7321 - 7325
(2007/10/02)
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