| Title |
Catalytic activity of mixed Cu, Co and Cr oxide catalysts / |
| Authors |
Čeplinskas, K ; Jaskūnas, A |
| DOI |
10.15388/CCT.2023 |
| ISBN |
9786090708330 |
| Full Text |
|
| Is Part of |
Chemistry and chemical technology: international conference CCT-2023, March 10, 2023, Vilnius: conference book.. Vilnius : Vilnius university press, 2023. P 031, p. 68.. ISBN 9786090708330 |
| Abstract [eng] |
Supported catalysts used to oxidate volatile organic compounds (VOCs) are usually prepared by wet impregnation method and one of the most active components in this area is CuO [1]. Active sites are formed through the process of adsorption of thermally destructible salts on the selected support and their subsequent calcination. Mixed metal oxides catalysts have great potential in the field of VOCs oxidation because of many kinds of fundamental structures and numerous possibilities of various compositions [2]. In this study the influence of various additions of Co and Cr oxides on catalytic activity of CuO was investigated. According to the previous research of Cu, Co and Cr adsorption on aluminum oxide, it was decided to investigate 5 different mixed oxide catalysts: Cu50/Al2O3; Cu50-Co10/Al2O3; Cu50-Co50/Al2O3; Cu50- Cr10/Al2O3; Cu50-Cr50/Al2O3 (numbers indicate corresponding concentrations of metal ions in sorption solution, g/l). Catalysts’ composition was determined using atomic absorption spectrometry. Catalysts with Co additives had the largest total amount of active components on the surface of support – up to ~14 % total catalyst’s mass. Formation of Cu and Cr oxide mixtures on the surface of support caused the decrease of CuO content. This indicates competitive simultaneous adsorption of active components. The maximum amount of active components in Cu-Cr oxide catalyst reached ~11,5 %, when compared to single CuO catalyst it was ~9 %. Measurements of catalytic activity and selectivity was made by complete oxidation of propyl acetate in the air in fixed catalyst bed tubular reactor. Amounts of propyl acetate and intermediate compounds were determined using gas chromatography and mass spectroscopy methods. CO, CO2 quantities were measured by gas composition analyzer. Oxidation experiments were carried out in temperature range from 150 to 300 °C with the step of 25 °C. Gas flow to the reactor was maintained constant at 1 l/min with initial concentration of propyl acetate ~1 g/m3 (±0,05 g/m3). [...]. |
| Published |
Vilnius : Vilnius university press, 2023 |
| Type |
Conference paper |
| Language |
English |
| Publication date |
2023 |
| CC license |
|
