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Thermodynamics and kinetics of the sulfation of porous calcium silicateThe sulfation of plasma sprayed calcium silicate in flowing SO2/air mixtures at 900 and 1000 C was investigated thermogravimetrically. Reaction products were analyzed using electron microprobe and X-ray diffraction analysis techniques, and results were compared with thermodynamic predictions. The percentage, by volume, of SO2 in air was varied between 0.036 and 10 percent. At 10 percent SO2 the weight gain curve displays a concave downward shoulder early in the sulfation process. An analytical model was developed which treats the initial process as one which decays exponentially with increasing time and the subsequent process as one which decays exponentially with increasing weight gain. At lower SO2 levels the initial rate is controlled by the reactant flow rate. At 1100 C and 0.036 percent SO2 there is no reaction, in agreement with thermodynamic predictions.
Document ID
19820007246
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Miller, R. A. (NASA Lewis Research Center Cleveland, OH, United States)
Kohl, F. J. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 4, 2013
Publication Date
January 1, 1981
Subject Category
Chemistry And Materials (General)
Report/Patent Number
E-1023
NASA-TM-82769
Meeting Information
Meeting: Fall Meeting of the Electrochem. Soc., Inc.,
Location: Denver, CO
Country: United States
Start Date: October 11, 1981
End Date: October 17, 1981
Accession Number
82N15119
Funding Number(s)
PROJECT: RTOP 505-33-12
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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