Abstract
Zeolite (Al)-ZSM-12 was synthesised in a broad, range of Si/Al ratio using methyltriethylammonium bromide as structure-directing agent with the aim to characterize the type and concentration of acid sites in dependence on Si/Al ratio and calcinations procedure. It was shown that the minimum Si/Al ratio, which can be achieved for ZSM-12, is around 37–40. FTIR spectroscopy used to investigate the adsorption of d 3 -acetonitrile on Broensted and Lewis acid sites revealed that both sites are present in a significant concentration after all calcination procedures. However, the amount of Lewis acid sites can be decreased using the proper way of calcination. The highest concentration of Broensted sites particularly at lower Si/Al ratios was achieved via calcinations of (Al)-ZSM-12 in a stream of ammonia followed by a repeated sodium ion exchange and further calcinations in a stream of air.
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