Thermogravimetric evolved gas analysis of urea and urea …
2013年8月10日 · Evolved gas analyses by mass spectroscopy and FTIR were used in combination with thermogravimetric analyses (TGA, DTG, and DTA) of pure urea, aqueous urea (S:C = 7) solution and urea with nickel catalyst samples.
TGA, DTA, and DTG curves for urea as a function of
Fig. 1 shows the TGA curve of mass loss for urea as a function of temperature. Superimposed on this are the results of DTA, which shows the difference in temperature between the sample and an...
Thermal decomposition (pyrolysis) of urea in an open reaction vessel
2004年12月15日 · A study was done of the thermal decomposition of urea under open reaction vessel conditions by thermogravimetric analysis (TGA), high performance liquid chromatography (HPLC), Fourier transform-infrared (FT-IR), and an ammonium ion-selective electrode (ISE).
Kinetic modeling of urea decomposition and byproduct formation
2021年2月2日 · A kinetic model for urea decomposition and byproduct formation was developed and validated against thermogravimetric analyses (TGA) of urea and urea-derived byproducts, including biuret and cyanuric acid, at heating rates up to 500 °C/min.
TGA curves of urea samples. | Download Scientific Diagram
Figure 4 shows the TGA data plot for all three urea samples. In the TGA data plot three major stages of mass loss are present, each of which are associated primarily with different pyrolysis...
TGA, DTA, and DTG curves for S : C = 7 urea solution as a function …
Thermal decomposition of urea, and aqueous urea solutions, in the presence of 18 wt % nickel on alumina was studied by thermogravimetric analysis. A range of evolved gas species (a wider range...
In this study, an analysis of urea decomposition under open reaction vessel conditions utilizing TGA, high performance liquid chromatography (HPLC), Fourier transform-infra red (FT-IR), and an am-monium ion-selective electrode (ISE), is reported.
Thermogravimetric Experiment of Urea at Constant Temperatures
In this paper, a temperature-rising thermogravimetric experiment of urea was carried out, and the mass loss of urea under different temperatures was observed to be similar to the results of predecessors.
Kinetic modeling of urea decomposition based on systematic ...
2014年3月17日 · The main reaction paths are identified based on the gaseous data analyzed by FTIR–TGA, combined with the analysis of solid phase concentration profiles by the high-performance liquid chromatography (HPLC) for urea and its most important by-product, biuret.
A study was done of the thermal decomposition of urea at different heating rate by thermogravimetric analyzer (TGA). The temperature and enthalpy of fusion of urea were calculated based on TG experiments carried out using different heating rates varying from 5 to 15 0C/min. Thus it was made possible to compare the contributions to the