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The transformation of the silico-molybdic acid (H 4 [SiMo 12 O 40 ]) used as catalyst in the dehydration of 1,4-butanediol was studied by IR, UV-VIS and ESR spectroscopies. During the reaction, the color of the catalyst changed gradually with the concomitant appearance of a broad new doublet in the 600–900 nm region in the electron spectra. At the beginning, ESR data indicate...
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