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1
Content available Green method of conversion of geraniol to value-added products in the presence of selected minerals
Fajdek-Bieda Anna, Wróblewska Agnieszka, Perec Andrzej, Miądlicki Piotr
Polish Journal of Chemical Technology
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2023
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Vol. 25, nr 1
47--60
EN
The study presents the results of research on the process of geraniol (GA) transformation in the presence of natural minerals: montmorillonite, mironekuton, halloysite and also in the presence of halloysite modified with 0.1 M water solution of H2SO4. To obtain information on the structure of the used catalysts, instrumental studies were performed (SEM, XRD, FT-IR, XRF, BET). The second part of the research consisted in examining the influence of individual parameters (temperature, catalyst content, and reaction time) on the course of GA transformation process. The syntheses were carried out without the application of solvent and under atmospheric pressure. To determine the most beneficial process conditions, two functions were selected: GA conversion and selectivity of GA. The proposed method of GA transformation on such minerals: montmorillonite, mironekuton, halloysite, has not been described in the literature so far.
2
Content available High performance fluidized bed photoreactor for ethylene decomposition
Rychtowski Piotr, Miądlicki Piotr, Prowans Bartłomiej, Tryba Beata
Polish Journal of Chemical Technology
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2022
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Vol. 24, nr 2
50--56
EN
Removal of C2H4 in the air was carried out in the continuous flow reactor with the photocatalytic bed (expanded polystyrene spheres coated by TiO2 or SiO2/TiO2) under irradiation of UV light. Continuous flow of a gas stream through the reactor was realised at the static bed and under bed fluidization. The required flow of a gas stream through the reactor for bed fluidisation was 500–700 ml/min, whereas for the static bed the flow rate of 20 ml/min was used. Fluidized bed reactor appeared to be much more efficient in ethylene removal than that with the stationary bed. It was caused by the increased speed of C2H4 mass transfer to the photocatalyst surface and better utilization of the incident UV light. In the fluidized bed reactor calculated rate of C2H4 degradation was around 10 μg/min whereas in the stationary state 1.2 μg/min only.
3
Content available 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
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2021
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Vol. 23, nr 2
73--80
EN
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.
4
Content available Effect of extraction method on the antioxidative activity of ground elder (Aegopodium podagraria L.)
Wróblewska Agnieszka, Janda Katarzyna, Makuch Edyta, Walasek Marika, Miądlicki Piotr, Jakubczyk Karolina
Polish Journal of Chemical Technology
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2019
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Vol. 21, nr 3
13--18
EN
In this work the studies on the antioxidative properties of extracts from various morphotic parts of the ground elder (leaves, rhizomes, seeds and flowers) were presented. Moreover, the effect of different extraction methods (ultrasonic assisted extractions, extraction in a Soxhlet apparatus, extraction at the boiling point of the solvent used), solvent and its amount, and extraction time on the antioxidative properties of the obtained extracts were tested. The studies showed that all parts of ground elder can show radical scavenging activity, and it depends mainly on the method of extraction and extraction time. But the most beneficial is ultrasonic assisted extraction which used lower amount of solvent (ethanol). In case of all parts of the ground elder (leaves, rhizomes, seeds and flowers) it allows to obtain very high values of the antioxidant capacity (above 90%) for very short extraction time amounted to 20–40 minutes.
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