Wyniki wyszukiwania

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Catalytic conversion CCI3F and CCI2F2 over metal supported catalysts

100%

Kirszensztejn P., Wachowski L., Szymkowiak A., Marciniak P., Czajka B., Skupinski W.

Polish Journal of Environmental Studies

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2003

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tom 12

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nr 3

A comparison of the catalytic properties of metals (Pt, Pd and Ru) supported on carbon in the process of catalytic hydrogenolysis of the C-halogen bond in CCl₂F₂ (CFC-12) and CCl₃F (CFC-11) was made. The mechanism of the halogen substitution in the catalytic conversion of CCl₃F was found to differ from that proposed for CCl₂F₂. The catalysts with Ru as the active phase were characterized by much lower activity than those with Pt or Pd, and the main products of conversion in the two reactions were CHClF₂ and CHCl₂F, so the products of substitution of only one chlorine atom in the molecule were obtained, in contrast to the case when Pt or Pd were used.

2

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Co(salen)-catalysed oxidation of synthetic lignin-like polymer: O2 effects

75%

Zhou X.-F.

Drewno. Prace Naukowe. Doniesienia. Komunikaty

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2013

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tom 56

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nr 190

Molecular oxygen (O2) is widely used as an oxidant in catalytic oxidation. This study was part of a biomimetic oxidation targeted at increasing the use of lignin in the production of chemicals through the application of salen transition metal catalysts. In this work, the catalytic performance of a cobalt-Schiff base catalyst Co(salen) in the presence of an oxidant and a ligand, such as pyridine, was analysed using two polymeric lignin model compounds. Oxidation experiments were carried out in alkaline water (pH 11-12) with the use of H2O2 and atmospheric oxygen (1atm) as oxidants. Co(salen) was an active catalyst, increasing the oxidation rate of the S- and G- type phenolic model polymers. In studies with FTIR, C-13 NMR, and GC-MS spectroscopy, the Co(salen)--catalysed oxidation rate was found to be high in the presence of O2. O2 had effects on the activity of the Co(salen), and it was concluded that the rate of the decomposition of the polymer was increased with the addition of O2. The structure of the lignin model polymers also had an effect on their decomposition. In the form of two CH3O-group polymers (S-type lignin model polymer), the depolymerisation decreased. Irrespective of the polymer (both S- and G- type lignin model polymers), the depolymerisation generated benzaldehydes as the main observed products. The model polymer studies were confirmed to be a useful way to obtain information about the reactions occurring during catalytic oxidation.

3

Metal salts as homogeneous catalysts for effective combustion of liquid fuels

63%

Tic W. J.

Polish Journal of Environmental Studies

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2008

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tom 17

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nr 3

439-441

Findings of research on the manufacture of metallic catalysts based on iron salts and iron-and-cerium salts of fatty acids dissolved in fuel oil are presented. Fatty acid metal salts are characterized by good solubility in fuel oil and the resulting catalyst solutions show low viscosities. The obtained metallic catalysts were used in mazout combustion tests in which reduced emissions of NOx and additional heat recovery were obtained as the result of complete fuel combustion.

Ograniczanie wyników

2 Polish Journal of Environmental Studies

1 Drewno. Prace Naukowe. Doniesienia. Komunikaty

1 Czajka B.

1 Kirszensztejn P.

1 Marciniak P.

1 Skupinski W.

1 Szymkowiak A.

1 Tic W. J.

1 Wachowski L.

1 Zhou X.-F.

1 2013

1 2008

1 2003

Catalytic conversion CCI3F and CCI2F2 over metal supported catalysts

Co(salen)-catalysed oxidation of synthetic lignin-like polymer: O2 effects

Metal salts as homogeneous catalysts for effective combustion of liquid fuels