Abstract
The stretching vibration of hydroxyl groups on H-ZSM-5 samples with different crystallite size and Al content was investigated by diffuse reflectance i.r. spectroscopy. Good linear relations for the intensity of the 3,740-cm−1 for the region versus the external surface area and the intensity of the 3,610-cm−1 for the region versus Al content were obtained. It is proven that the absorbance at 3,740 cm−1 is attributed to the terminal (Si-) O-H groups, which are located completely on the external surface, and an absorbance at 3,610 cm−1 is ascribed to (Al-)O-H groups, which are distributed on both the external and internal surface of H-ZSM-5.
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