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This study aims to explore how WO3 and Fe2O3 modify the mechanism of H2-SCR in Pt/SiO2-Al2O3 catalysts over various temperatures.

March 21, 2026ChemCatChemOpen Access

Effect of WO 3 and Fe 2 O 3 Additives on H 2 ‐SCR Over Pt/SiO 2 ─Al 2 O 3 Catalysts: An Operando DRIFTS Investigation

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Operando investigation of H2-SCR pathways in catalysts modified with WO3 or Fe2O3, indicating distinct reactivity changes.

This study aims to explore how WO3 and Fe2O3 modify the mechanism of H2-SCR in Pt/SiO2-Al2O3 catalysts over various temperatures.
Used 0.3 wt.% Pt/SiO2-Al2O3 catalysts, with and without WO3 and Fe2O3 additives.
Conducted operando DRIFTS investigations to analyze reaction pathways.
Examined catalytic performance across a temperature range of 50–200°C.
WO3 enhances H2 activation at low temperatures, improving catalytic activity.
Fe2O3 inhibits NO reduction and suppresses low-temperature N2O formation.
NH3-SCR pathway is promoted by WO3 but limited due to unconverted NOX presence.
At temperatures above 150°C, neither WO3 nor Fe2O3 significantly affects the NH3 + O2 reaction.

Attia et al. (2026) studied this question.

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