A study on the selective catalytic reduction of NO _<i>x</i> by ammonia on sulphated iron-based catalysts.

Accordingly, when the content of Fe 3+ was constant, with an increase in SO 4 2− , the concentration of Fe atoms on the surface showed a decreasing trend.

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With the further addition of SO 4 2− to 15%, the NO x conversion exhibited an increasing trend from 150 °C to 500 °C, which was much lower than that of the FeS 5 Zr catalyst in the range of 150–450 °C but it reached close to 100% at 500 °C. 3.2 Impact of Fe 3+ and SO 4 2− loading on ammonia oxidation Fig. 2(a) shows the curve of ammonia oxidation using a series of acidified catalysts in the temperature range of 150–500 °C.

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