Abstract
Iron catalysts supported on ZSM-5 zeolites of a wide range of silica-to-alumina ratios (29-∞) have been prepared and tested in carbon monoxide hydrogenation. The crystalline phases of the catalysts were characterized by X-ray diffraction and their acidity by infrared spectroscopy of adsorbed pyridine. The catalytic tests were conducted at 533 K, an overall pressure of 21 bar and a feed ratio CO/H2 close to 1. It was found that the selectivity to light olefins (C2–C4) increases in parallel with the increase of the Si/Al ratio of the zeolite. This was explained in terms of the decrease in Bronsted acidity of the catalysts. As a consequence, very high olefin selectivities can be achieved by decreasing the number of strong acid sites in the zeolite structure, but at the expense of high oxygenate formation.
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