The pore size of acidic Cs salts (CsxH3−xPW12O40) was precisely controlled by the Cs content. Cs2.2H0.8PW12O40 possesses micropores in the range from 6.2 to 7.5 Å (in diameter) and exhibits efficient shape selective catalysis toward decomposition of ester, dehydration of alcohol, and alkylation of aromatics in liquid-solid system. This is the first example of shape-selective solid superacid.
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Okuhara et al. (1995) studied this question.
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