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2 Polish Journal of Chemical Technology

2 2020

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The application of modified layered double hydroxides in selective catalytic reduction of nitrogen oxides by ammonia (NH3-SCR)

Szymaszek Agnieszka, Motak Monika, Samojeden Bogdan

Polish Journal of Chemical Technology

2020

Vol. 22, nr 1

61--67

Selective catalytic reduction with ammonia (NH3-SCR) is very efficient DeNOx technique. According to some problems with the commercial catalyst, novel one should be prepared. Hydrotalcites are potential precursors of the new catalysts of NH3-SCR. In this paper, several attempts to apply these materials in NH3-SCR are presented.

Effect of the Yerba mate (Ilex paraguariensis) brewing method on the content of selected elements and antioxidant potential of infusions

Janda Katarzyna, Jakubczyk Karolina, Łukomska Agnieszka, Baranowska-Bosiacka Irena, Rębacz-Maron Ewa, Dec Karolina, Kochman Joanna, Gutowska Izabela

Polish Journal of Chemical Technology

2020

Vol. 22, nr 1

54--60

Yerba mate is a source of biologically active substances. The aim was to determine whether the place of origin of Yerba and the brewing method have any influence on the levels of Ca, Mg and Fe and antioxidant activity of infusions. Samples were steeped in cold water (25o C) and hot water (three consecutive infusions with 85o C water). Infusions had a high antioxidant activity and high Mg level. The levels of elements and the antioxidant activity were influenced by the brewing method. There were no significant differences in the examined parameters depending on the country of origin. The results on the levels of elements and the antioxidant activity indicate that the most efficient brewing method was infusion in hot water. The highest levels of elements were found in first infusions, with the highest antioxidant activity in the third infusions.