CeO2–MnOx/ZSM-5 sorbents for H2S removal at high temperature

• The sulfidation activity of CeO2 was significantly enhanced by addition of Mn.
• 5Ce5Mn/ZSM-5 sorbent had the highest sulfur capacity of 7653.1 μmol S/g.
• H2 repressed sulfur removal and CO had a little impact on sulfidation reaction.

xCeyMn/ZSM-5 sorbents were prepared using sol–gel method and employed for H2S removal in the temperature range of 600–800 °C. The sorbents exhibited high performance in sulfur removal due to the cooperative effect of CeO2 and MnOx. The presence of H2 was unfavorable for sulfidation and obviously shortened the breakthrough time and reduced the sulfur capacity. However, the existence of CO had little impact on the sulfur-removal performance. The characterization results revealed that the ZSM-5 structure remained intact during preparation and sulfidation process. And active species, such as CeO2 and Mn2O3, were well dispersed on ZSM-5, which would suppress the mechanical disintegration and improve the thermal stability of xCeyMn/ZSM-5.

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