Abstract
Catalytic decomposition of 100ppmv pyridine (C5H5N) with an Australian limonite ore, composed mainly of goethite (α-FeOOH), has been examined for hot gas cleanup with a fixed-bed quartz reactor at 300–500°C under a large space velocity of 51,000h−1. When α-FeOOH in the limonite is reduced with pure H2 at 500°C, the transformation into nanoscale particles of metallic iron (α-Fe) occurs, and the catalyst achieves almost complete C5H5N decomposition in inert He at 500°C and provides an N2 yield greater than 80% for at least 10h. The limonite also exhibits a high catalytic activity at 500°C, even without H2 reduction. Based on the results of N 1s X-ray photoelectron spectroscopy and temperature-programmed desorption measurements, it is probable that the limonite-catalyzed formation of N2 from pyridine proceeds through cycle mechanisms involving α-Fe and iron nitride species.
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