Publication Date:
2019-07-13
Description:
The 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.
Keywords:
CHEMISTRY AND MATERIALS (GENERAL)
Type:
NASA-TM-82769
,
E-1023
,
Fall Meeting of the Electrochem. Soc., Inc.,; Oct 11, 1981 - Oct 17, 1981; Denver, CO; United States
Format:
application/pdf
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