Enhanced sulfur-resistance in Fe-based catalysts with secondary crystallization for the removal of odorous S-VOCs (CH3SH)

Abstract

Sulfur poisoning is a major challenge in the design of high-performance heterogeneous catalysts. In this study, an effective sulfur-resistant catalyst for the catalytic decomposition of CH3SH was prepared by a secondary crystallization method. Compared with the conventional impregnation method, this method can effectively regulate the position of Fe on the S-1 support and the property of the acidic site. The strong redox properties, strong acidity and highly dispersed Fe species on the modified 2.5 % Fe@S-1 catalyst contributed to the improvement of the low-temperature activity of the catalytic decomposition of CH3SH, and increased the sulfur and coke resistantce of the catalyst. As expected, the 2.5 % Fe@S-1 catalyst maintained 90 % CH3SH conversion within 80 h of TOS. By contrast, Fe particles in 2.5 % Fe/S-1 catalysts was large and prone to agglomeration, resulting in poor catalyst stability. It was shown that Fe-based catalysts prepared by the secondary crystallization method have potential applications in CH3SH degradation.