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Badanie aktywności katalizatorów Ni-Al2O3 w procesie uwodornienia kwasu maleinowego

Gawdzik A., Wiener M.

Przemysł Chemiczny

2016

T. 95, nr 5

978--980

Zbadano wpływ zawartości aluminium na aktywność katalizatorów Ni-Al2O3 w procesie uwodornienia kwasu maleinowego. Aktywność katalityczną mierzono metodą potencjometryczną. Najwyższą aktywność katalityczną wykazywał katalizator zawierający 1% mol. Al. Stwierdzono obniżenie aktywności badanych katalizatorów ze wzrostem temperatury procesu uwodornienia.

Seven Ni/Al2O3 catalysts (Al content up to 10% by mole) were prepd. by copptn. from aq. solns. of Al(NO3)3 and NiCO3·2Ni(OH) 2, calcination at 600°C for 2 h and redn. with H2. The catalysts were used for hydrogenation of maleic acid to study their catalytic activity. The catalyst with Al content 1% by mole showed the highest catalytic activity.

Modified and unmodified zinc oxide as coagent in elastomer compounds

Kołodziejczak-Radzimska A., Jesionowski T., Maciejewska M., Zaborski M.

Polish Journal of Chemical Technology

2014

Vol. 16, nr 3

63--68

The aim of this work was to study the activity of unmodifi ed and modifi ed ZnO in the peroxide crosslinking of hydrogenated acrylonitrile-butadiene elastomer (HNBR) and ethylene-propylene copolymer (EPM). In the fi rst step, zinc oxide was obtained by emulsion precipitation. Maleic acid was introduced onto the surface of ZnO Rusing an in situ method. The unmodified and modified zinc oxide was characterized using dispersive and morphological analysis, BET surface area analysis, and elemental, spectroscopic and thermal analysis. In the second stage of the research, the ZnO/MA systems were incorporated into the structure of elastomer compounds improving the kinetic and mechanical properties of vulcanizates. The proposed modification method had a favorable effect on the physicochemical properties of the zinc oxide and on the kinetic and mechanical properties of the vulcanizates. This study demonstrated that modification of zinc oxide by maleic acid is a promising technique.

Plasma degradation of organic compounds: oxidation of oxalic and maleic acids

Bellakhal N., Brisset J.-L.

Polish Journal of Applied Chemistry

1999

Vol. 43, nr 1-2

23-28

Solid Oxalic and Maleic acid pellets are exposed to an inductively coupled oxygen plasma to investigate the oxidizing properties of the plasma on organic powders in view of ageing studies. Both acids degrade to carbon dioxide according to pseudo 1 st order reactions with kinetic constants k= 0.250 min- 1 and k=0.098 min-I respectively, relevant to the experimental conditions. Models involving the oxygen atoms present in the plasma phase are proposed [or the degradation mechanism.