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From Table 1 it is evident that the percentage conversion of methanol increases in the following order AS < AM < AU with 100% product selectivity. However, BET surface area follows the order AM < AS < AU. Although the highest conversion of 64% was achieved in case of catalyst AU having surface area of 246 m2/g, there was no clear correlation between the surface area and the catalytic activity.
Hence it was necessary to investigate the nature of the acid sites.

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