Urea thermolysis studied under flow reactor conditions using DSC and FT-IR
Journal article, 2009
The thermal decomposition of urea has been studied under flow reactor conditions using a differential scanning calorimeter (DSC) and Fourier transformed infrared spectroscopy (FT-IR). Samples of urea were administered using either a cordierite monolith impregnated with a urea/water solution or a silica cup with a dry urea sample. The samples were heated between 25 and 700 degrees C with heating rates of 10 and 20 K/min and the thermal response of the sample and off gas concentrations of ammonia and isocyanic acid were recorded. Biuret and cyanuric acid were decomposed in a separate set of experiments to verify some of the features observed in gas phase data during urea decomposition. Results show that depending on the way the sample is administered, i.e. cup or monolith different behavior in the evolved gases are observed. This is due to different reactions taking place in the vessel induced by the different conditions under which the pyrolysis of urea is preformed. (C) 2009 Elsevier B.V. All rights reserved.
Urea decomposition
CYA
acid
Mass-transfer
selective catalytic-reduction
thermal-decomposition pyrolysis
Calorimeter
scr
catalysts
DSC
HNCO
Biuret
NH3
Heat transfer
nox reduction
FT-IR
Author
Andreas Lundström
Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering
Competence Centre for Catalysis (KCK)
Bengt Andersson
Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering
Competence Centre for Catalysis (KCK)
Louise Olsson
Competence Centre for Catalysis (KCK)
Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering
Chemical Engineering Journal
1385-8947 (ISSN)
Vol. 150 2-3 544-550Areas of Advance
Transport
Materials Science
Subject Categories
Chemical Process Engineering
DOI
10.1016/j.cej.2009.03.044