Enhanced
stability of iron-based catalysts by noble metals has
been previously reported. To further understand the efficiency of
precious metals in preventing the Fe surface from being oxidized,
we synthesized a series of Pt-doped Fe catalysts with controlled amounts
of Pt decoration on the Fe surface using one-pot hydrolysis and co-condensation
of inorganic salts, which were then studied in the hydrodeoxygenation
(HDO) of m-cresol. The results showed that the addition
of Pt could significantly improve the catalyst activity and stability
in the HDO of m-cresol. A minimum Pt/Fe atomic ratio
of 1/13 was found to maintain the Fe stability, implying that Pt has
an ensembled effect on Fe or Pt atoms to stabilize neighboring Fe
atoms. In particular, a 0.05Pt–Fe catalyst with a trace amount
of Pt (50 ppm or 0.05 wt % Pt) showed excellent stability without
oxidation for 40 h time-on-stream even in the presence of H2O. This work illustrates that the activity and stability of earth
abundant Fe-based catalysts can be improved with ppm precious metals.
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