Chem. J. Chinese Universities ›› 1986, Vol. 7 ›› Issue (6): 522.
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Cai Tianxi, Sh Renmin, Chen Ping, Wang Daqing, Li Luhui
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Abstract: IRstudy showed that the Fe3+, Mg3+ and Na+ salts of H3PW12O40 have both Lewis acid and Bronsted acid sites. The relative acid strength of salts of H3PW12O40 determined by Benesi’s method is roughly as follows.(Al3+, Fe3+ , La3+, Cu3+ , Cd3+)>Zn2+>(Ca2+, Mg2+ )(Na2+, Li2+)The total acidity of H0≤+ 6.8 related approximately linearly with ionic potential and the electronegativity of the countercations. The acid quantity varied with the calcination temperatnre, showing maximum at 200-250℃.The somewhat different form of the graphs of catalytic activity versus acidity of catalysts on dehydration of isopropanol and isomerization of butene-1 might be due to that the former reaction occured in the bulk of the catalysts.
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Cai Tianxi, Sh Renmin, Chen Ping, Wang Daqing, Li Luhui . Investigation on the Acidity and Catalytic Activity of H3PW12/sub> O40 and Its Salts[J]. Chem. J. Chinese Universities, 1986, 7(6): 522.
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http://www.cjcu.jlu.edu.cn/EN/Y1986/V7/I6/522
