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Fe-modified activated carbon obtained from biomass as a catalyst for α-pinene autoxidation

Kamińska Adrianna, Maciejewska Nikola, Miądlicki Piotr, Kiełbasa Karolina, Sreńscek-Nazzal Joanna, Michalkiewicz Beata

Polish Journal of Chemical Technology

2021

Vol. 23, nr 2

73--80

The presented work describes the autoxidation of alpha-pinene for the first time using a catalyst based on activated carbon from biomass with introduced Fe. The raw material for the preparation of the carbon material was waste orange peel, which was activated with a KOH solution. The following instrumental methods characterized the obtained catalyst (Fe/O_AC):N2 adsorption at 77 K, XRD, UV, SEM, TEM, X-ray microanalysis, and catalytic studies. It was shown that the Fe/O_AC catalyst was very active in the autoxidation of alpha-pinene. The main reaction products were: alpha-pinene oxide, verbenone, verbenol, and campholenic aldehyde.

Commercial Kevlar derived activated carbons for CO2 and C2H4 sorption

Kaliszewski M., Zgrzebnicki M., Kałamaga A., Pinjara S., Wróbel R. J.

Polish Journal of Chemical Technology

2021

Vol. 23, nr 2

81--87

The carbonaceous precursor was obtained via pyrolysis of commercial aramid polymer (Kevlar). Additionally the precursor was activated at 1000°C in CO2 atmosphere for different times. Obtained materials were characterised by BET; XPS; SEM and optical microscopy. The sorption capacities were determined by temperature swing adsorption performed in TGA apparatus for CO2 and C2H4 gases. The obtained materials exhibit high difference in sorption of these gases i.e. 1.5 and 2.8 mmol/g @30°C respectively and high SSA ~1600 m2/g what can be applied in separation applications. The highest uptakes were 1.8 and 3.1 mmol/g @30°C respectively. It was found that the presence of oxygen and nitrogen functional groups enhances C2H4/CO2 uptake ratio.

SO2 Inducedliberation of halide anions from organics

Bronikowski T., Pasiuk-Bronikowska W., Ulejczyk M.

Archiwum Ochrony Środowiska

1999

Vol. 25, no. 2

9-16

To shed more light chemical transformations of pollutants in atmospheric waters, the interaction between sulphoxo radicals ( SO(-3), SO(-4), SO(-5)) and some halogenated organic compounds (1,2,4,5-tetrakis(trifluoromethyl)benzene, 2,4,5-trichlorophenol and 2,5-dichlorophenol) in the aqueous phase was studied. The radicals were generated in a laboratory reactor with a planar gas-liquid interface where the autoxidation of dissolved SO2(SO(2-3), HSO(-3)) took place. The following effects were found: distinct reduction in the rate of SO2 oxidation to SO(2-4)(conductometric method), transformations of the initially applied organic compounds (as shown by uv-spectra) and liberation of halide ions (ionic chromatography). Suggestions on the mechanism of the interaction were given.

Zmierzając do wyjaśnienia chemicznych przemian polutantów w wodach atmosferycznych, badano wzajemne oddziaływane rodników siarkotlenowych i niektórych halogenopochodnych związków organicznych (1,2,4,5-tetrakis(trifluorometylo)benzenu, 2,4,5-trichlorofenolu oraz 2,5-dichlorofenolu) w fazie wodnej. Rodniki te generowano w laboratoryjnym reaktorze z płaską powierzchnią gaz-ciecz, w którym prowadzono autooksydację rozpuszczonego SO2(SO(2-3), HSO(-3)). Stwierdzono znaczne obniżenie szybkości wytwarzania SO(2-4) w obecności badanych związków organicznych (pomiary konduktometryczne), przemiany tych związków w czasie eksperymentów (badania spektrofotometryczne) oraz uwalnianie jonów halogenkowych (analiza metodą chromatografii jonowej). Przedstawiono sugestie dotyczące mechanizmu obserwowanych oddziaływań.