A New Hypothesis Regarding the Surface Acidity of Binary Metal Oxides

We have proposed a new hypothesis that the acid sites on binary metal oxides are formed by an excess of a negative or positive charge in the mixed oxides and that whether the charge is excess or not, and whether it is positive or negative, are determined by the coordination numbers and valences of t...

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Published inBulletin of the Chemical Society of Japan Vol. 47; no. 5; pp. 1064 - 1066
Main Authors Tanabe, Kozo, Sumiyoshi, Takashi, Shibata, Katsue, Kiyoura, Tadamitsu, Kitagawa, Jun
Format Journal Article
LanguageEnglish
Published Tokyo The Chemical Society of Japan 01.05.1974
Chemical Society of Japan
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Summary:We have proposed a new hypothesis that the acid sites on binary metal oxides are formed by an excess of a negative or positive charge in the mixed oxides and that whether the charge is excess or not, and whether it is positive or negative, are determined by the coordination numbers and valences of the positive and negative elements in the model structures pictured according to two postulates. The validity of the hypothesis is, in fact, 90% for the 31 kinds of binary oxides tested, much higher than the validity (48%) of Thomas’ hypothesis. The hypothesis explains well the mechanism of the acidity generation of binary oxides and predicts whether the acid sites will be of the Brönsted or the Lewis type.
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.47.1064