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《Chemical Research In Chinese Universities》 1992-12
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Studies on the Formation of ZrO_2/SO_4~(2-)Superacid System

Gao Zi,Chen Jian-min,Tang Yi (Department of Chemistry,Fudan University,Shanghai,200433)  
The crystallization,phase transition,dehydration and desulfuration of amorphous ZrO2 impregnated by H2SO4 under various calcination temperatures were studied with XRD,TG-DTG-DTA,SEM and chemical analysis methods.It was found that all these processes are evidently related with the formation of superacid.There are no water and free H2SO4 present in the ZrO2/SO42-superacid system,and the acid strength of the superacid system reaches the maximum as the amorphous ZrO2 transforms into a tetragonal crystal phase and slightly less than 1/3 of the surface Zr atoms are bonded with SO42-radicals.
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