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1
Content available remote Katalizatory dla procesu utleniającego sprzęgania metanu
Michorczyk B., Ogonowski J., Michorczyk P., Węgrzyniak A.
Przemysł Chemiczny
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2014
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T. 93, nr 7
1166-1173
PL
Przedstawiono aktualny stan wiedzy na temat katalizatorów dla procesu utleniającego sprzęgania metanu (OCM). Opisane w literaturze katalizatory sklasyfikowano w grupach w zależności od ich składu. Scharakteryzowano, każdą z grup katalizatorów, porównano właściwości katalityczne najbardziej obiecujących katalizatorów oraz opisano wady i zalety ich użytkowania. Ponadto, opisano wpływ właściwości, takich jak redukowalność, charakter kwasowo-zasadowy i przewodnictwo elektryczne materiałów katalitycznych na ich aktywność i selektywność w OCM.
EN
A review, with 142 refs.
2
Content available remote Conversion methods of methyl bisulfate dissolved in oleum into methan
Michalkiewicz B.
Polish Journal of Chemical Technology
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2006
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Vol. 8, nr 2
68-69
EN
Three methods of converting methyl bisulfate dissolved in oleum into methanol have been described. In the first one, the ester present in the oleum was hydrolyzed to methanol by adding water to the mixture. In the second method the ester was vaporized in the flowing air stream and then, methyl bisulfate vapour was absorbed in water. In the third one, the ester was separated from the post-reaction mixture by means of membrane distillation, sucked by a pump and absorbed in water. It was found that the two-stage membrane distillation was the most effective method.
3
Content available remote Seclective methane oxidation to organic derivatives
Michalkiewicz B.
Polish Journal of Chemical Technology
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2005
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Vol. 7, nr 3
77-80
EN
Three methods of methane conversion into oxidants, excluding the stage of obtaining the synthesis gas, are known: partial catalytic oxidation over the heterogeneous catalysts, non-catalytic process of oxidation under pressure and methane esterification combined with hydrolysis. When taking into consideration the results of the studies on methane partial oxidation which have been conducted over a number of years, the last method seems to be the most promising one. The obtained ratio of methane conversion into methanol as the final product, comprises nearly 100% when the process is run in oleum, and platinum chloride (IV) acts as the catalyst.
4
Reactions of methane in dielectric-barrier discharges
Górska A., Sentek J., Krawczyk K., Schmidt-Szałowski K.
Polish Journal of Applied Chemistry
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2005
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Vol. 49, nr 1-2
91-100
EN
The reactions of methane under the conditions of barrier discharges were studied in the mixtures: 1) 50% CH4+ 50% Ar, 2) 50%CH4+ 25%CO2+ 25% Ar, and 3) 50%CH4+ 50%CO2, under atmospheric pressure at about 50°C and about 300°C. Besides hydrogen, ethane was the main gaseous product of the reaction, with small additions of ethylene and acetylene. An increase of the overall methane conversion and conversion into C2 hydrocarbons was observed in cases where grains of quartz glass was packed in the discharge gap.
5
Content available remote The effect of boron and magnesium additives on catalytic perform of Mo-0/Si02 in the partial oxidation of methane
Kałucki K., Michalkiewicz B.
Polish Journal of Chemical Technology
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2001
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Vol. 3, nr 4
16-19
EN
The effect of boron or magnesium additive to the catalyst containing molybdenum oxide on the methane conversion and the selectivity of methane oxidation to the particular products have been investigated. It has been found that the boron used as an additive, elevated the selectivity of methane oxidation to formaldehyde. The highest methane conversion wasobtainet over the Mo-0/SiO2 catalyst. For the catalysts with additives, the conversion was low. Both boron and magnesium allow the elimination of the oxidation reaction of carbon monoxide to carbon dioxide.
6
Content available remote Partial oxidation of methane to formaldehyde over a Mo-0/Si02 catalyst
Kałucki K., Michalkiewicz M.
Polish Journal of Chemical Technology
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2000
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Vol. 2, nr 2
17-20
EN
Studies on the oxidation of methane by oxygen over a Mo-O/SiO2 catalyst were performed in a vertical tubular reactor. The process was carried out over a range of temperatures from 400 to 600°C at atmospheric pressure. Both the content of oxygen in the reaction mixture and the contact time were varied. The major products of the oxidation of methane over the Mo-O/SiO, catalyst have been formaldehyde, carbon oxides, and water. The effect of temperature, contact time and methane conversion on the selectivity of methane oxidation to the respective products was studied. The mechanism of the reactions proceeding during the oxidation of methane by oxygen over this catalyst has been proposed.
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