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The effect of SO2 on catalytic activity for NO reduction to N2 by methanol in excess oxygen over $$\gamma$$ -alumina has been investigated. SCR activity increased initially upon exposure of a fresh $$\gamma$$ -alumina catalyst to SO2 which is attributed to formation of Brønsted acid sites. Longer exposure to SO2 leads to a decline in catalytic activity to a lower steady-state NOx reduction...
The DME‐SCR activity was suppressed upon exposure of a γ-alumina catalyst to SO2, in contrast to methanol‐SCR, which remains active at the same surface sulphate coverage. This difference in behaviour is attributed to the limited availability of surface methoxy, which may be regarded as a prerequisite for NOx- reduction over γ-alumina under lean conditions, in the case of dimethyl ether in the presence...
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