Thermal behavior of the as-synthesized 0.10Sr/MgO sample was monitored by TGA/DTA.
There were two major endothermic weight losses (Fig. 1): one at 275–375 C and the other at 500–600 C.
The former weight loss of 22% was ascribed to the endothermic decomposition of Mg(OH)2 to MgO, which occurs at 350 C.
The latter 15% loss was well corresponded to the theoretical weight change for the decomposition of (Sr(NO3)2)0.1/MgO to (SrO)0.1/MgO.
This weight loss was also accompanied by two overlapping consecutive endothermic DTA peaks at 550 and 600 C attributed to the melting of Sr(NO3)2 and its decomposition to SrO, respectively.
In comparison to pure Sr(NO3)2, which melts at ca. 571 C and decomposes at ca. 658 C [18], these two peaks shifted to lower temperatures, suggesting that the interaction of
Sr(NO3)2 with MgO facilitates the transformation processes.
At temperature higher than 600 C, no further catalyst transformation was observed.ฃ
were determined following
Thermal behavior of the as-synthesized 0.10Sr/MgO sample was monitored by TGA/DTA.
There were two major endothermic weight losses (Fig. 1): one at 275–375 C and the other at 500–600 C.
The former weight loss of 22% was ascribed to the endothermic decomposition of Mg(OH)2 to MgO, which occurs at 350 C.
The latter 15% loss was well corresponded to the theoretical weight change for the decomposition of (Sr(NO3)2)0.1/MgO to (SrO)0.1/MgO.
This weight loss was also accompanied by two overlapping consecutive endothermic DTA peaks at 550 and 600 C attributed to the melting of Sr(NO3)2 and its decomposition to SrO, respectively.
In comparison to pure Sr(NO3)2, which melts at ca. 571 C and decomposes at ca. 658 C [18], these two peaks shifted to lower temperatures, suggesting that the interaction of
Sr(NO3)2 with MgO facilitates the transformation processes.
At temperature higher than 600 C, no further catalyst transformation was observed.ฃ
were determined following
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