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Several spectroscopic techniques have been used to investigate the acidic properties of a set of galliosilicate molecular sieves with the offretite structure. IR spectra in the OH stretching region contain well-defined bands at or near 3735, 3640, 3600 and 3550 cm -1 that can be attributed to OH groups associated with SiOH, and with M(IV)OH groups located in secondary building units,...
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