Optimization of Cs Content in Co-Mn-Al Mixed Oxide as Catalyst for N2O Decomposition.

0456093 - ÚCHP 2016 RIV NL eng J - Journal Article
Chromčáková, Ž. - Obalová, L. - Kustrowski, P. - Drozdek, M. - Karásková, K. - Jirátová, Květa - Kovanda, F.
Optimization of Cs Content in Co-Mn-Al Mixed Oxide as Catalyst for N2O Decomposition.
Research on Chemical Intermediates. Roč. 41, č. 12 (2015), s. 9319-9332. ISSN 0922-6168. E-ISSN 1568-5675.
[Pannonian Symposium on Catalysis /12./. Třešť, 16.09.2014-20.09.2014]
R&D Projects: GA ČR GA14-13750S
Institutional support: RVO:67985858
Keywords : nitrous oxide * mixed oxide catalysts * cesium promoter * layered double hydroxides
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
Impact factor: 1.833, year: 2015

A series of Co–Mn–Al mixed oxide catalysts with different Cs contents (0.5–4.6 wt%) was prepared by calcination of Co–Mn–Al hydrotalcite (Co:Mn:Al = 4:1:1), followed by impregnation by cesium salt (CsNO3, Cs2CO3) using the pore filling method. Chemical analysis, N2 sorption, temperature programmed reduction (TPR)-H2, temperature programmed desorption (TPD)-CO2 and TPD-NH3 and X-ray photoelectron spectroscopy (XPS) were used to characterize the catalysts. All prepared catalysts were tested for N2O catalytic decomposition in inert gas and in the presence of oxygen, water vapor and nitric oxide. The influence of Cs salts used for catalyst preparation and cesium content on catalyst activity were studied. A significant increase in catalytic activity with increasing amount of cesium promoter was observed without respect to the Cs precursor. The strong promotional effect of cesium is electronic in nature and is discussed in term of changes in surface composition and catalyst reducibility.
Permanent Link: http://hdl.handle.net/11104/0256665