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Urea thermolysis studied under flow reactor conditions using DSC and FT-IR

Andreas Lundström (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik ; Kompetenscentrum katalys (KCK)) ; Bengt Andersson (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik ; Kompetenscentrum katalys (KCK)) ; Louise Olsson (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik ; Kompetenscentrum katalys (KCK))
Chemical Engineering Journal (1385-8947). Vol. 150 (2009), 2-3, p. 544-550.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Urea decomposition, DSC, Calorimeter, FT-IR, NH3, HNCO, CYA, Biuret, Mass-transfer, Heat transfer, selective catalytic-reduction, thermal-decomposition pyrolysis, scr, catalysts, nox reduction, acid



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Denna post skapades 2010-03-01. Senast ändrad 2012-04-09.
CPL Pubid: 116738

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik (2005-2014)
Kompetenscentrum katalys (KCK)

Ämnesområden

Materialvetenskap
Transport
Kemiska processer

Chalmers infrastruktur

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