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By Kozo Tanabe

Sturdy Acids and Bases

summary: stable Acids and Bases

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T. Kawaguchi, S. Hasegawa and Y. Nakamura, Tokyo Gakugei Daigaku Kiyö (Japanese), 20, Section 4, No. 1, p. 75 (1968). T. Kawaguchi, S. Hasegawa, K. Kaseda and S. Kurita, Denshi Shashin ( Japanese), 8, 92 (1968). Y. Trambouze, M. Perrin and L. de Mourgues, Advances in Catalysis, vol. 9, p. 544, Academic Press, 1957. H. P. Leftin and W. K. Hall, Actes Congr. Intern. Catalyse, 2e, Paris, II, No. 65 (1960, Pub. 1961). A. Nakamura, K. Sano, K. Takemura and T. Shiba, Shokubai (Tokyo), 4, No. 1, 58 (1962).

4-3 Suggested scheme for acidic and basic sites on r-alumina Letters A to E identify the different types of isolated hydroxyl ions, and " + " denotes an Al3+ ion on the layer below the surface The five absorption maxima which are observed in the infrared spectra (at 3,800, 3,780, 3,744, 3,733 and 3,700 cm" 1 ) are associated with sites A, D, B, E and C respectively. Each site has a different local charge density: type A with 4 O 2 - ions as neighbours is the most negative (a basic site), and type C lacking neighbours is the most positive (an acidic site).

3-3, the base amount increases sharply with increase in the amount of water within the range of 3 to 8 mmol/g and then attains a constant value. 20) The basic sites begin to appear when the adsorbed water is sufficient to poison all the acid sites on the alumina. No such appearance of basic sites due to water adsorption has ever been reported with either silica gel or silica-alumina. Take et al. 1). 2 Amount of adsorbed water (mmol/g) Fig. 3-3 Amount of base vs. 1) The former consist of titration of a catalyst suspension in water against sulfuric acid solution, and the latter involves potentiometric titration with perchloric acid solution in anhydrous acetic acid.

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