Effect of Potassium in Layered Double Hydroxide-related Co-Mn-Al Mixed Oxide Catalyst on Deep Oxidation of VOC

0312053 - ÚCHP 2009 GB eng C - Konferenční příspěvek (zahraniční konf.)
Jirátová, Květa - Gaálová, Jana - Klempa, Jan - Grygar, Tomáš - Bastl, Zdeněk - Kovanda, F.
Effect of Potassium in Layered Double Hydroxide-related Co-Mn-Al Mixed Oxide Catalyst on Deep Oxidation of VOC.
[Efekt draslíku v Co-Mn-Al směsných oxidických katalyzátorech pro oxidaci VOC.]
Book of Abstracts. Belfast: CenTACat, 2008 - (Failte, C.), s. 356
[5th International Conference on Environmental Catalysis. Belfast (GB), 31.08.2008-03.09.2008]
Grant CEP: GA ČR GA104/07/1400
Výzkumný záměr: CEZ:AV0Z40720504; CEZ:AV0Z40320502; CEZ:AV0Z40400503
Klíčová slova: Co-Mn-Al mixed oxide * oxidation of voc
Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství

The highest catalytic activity in toluene oxidation was performed with the catalyst containing of about 1 wt% K, while in ethanol oxidation such maximum was observed for the catalyst having nearly 3 wt% K. Reaction temperatures T50 necessary for achieving the conversion of 50 % decreased by 15 °C for toluene and by 35 °C for ethanol. The greatest effect of K on Co4MnAl catalyst was found out in selectivity of ethanol oxidation: Addition of K suppressed formation of undesirable reaction byproducts, i.e. acetaldehyde and acetic acid, more than 10 times. It can be concluded that both high catalytic activity and selectivity (in ethanol oxidation) can be achieved by addition of an optimum amount of potassium promoter. It changes size of crystallites, redox and acid-base properties of the mixed oxide catalyst as revealed by various techniques (XRD, BET, TPR, Raman spectroscopy, XPS, TPD(NH3) and TPD(CO2)).

Draslík v malém množství (kolem 1%) má pozitivní efekt na aktivitu Co-Mn-Al směsných oxidů při oxidaci toluenu i etanolu.
Trvalý link: http://hdl.handle.net/11104/0163220