Abstract
Ni2+ doped ZnO/MCM-41 adsorbents with various doping content were prepared by melt infiltration method and its effect on the room temperature desulfurization and regeneration performance of ZnO adsorbents were systemically investigated. The experimental results indicated that the H2S removal capacity of the adsorbents first increased and then decreased with increasing the Ni2+ doping content, its value reaches the highest of 72.5 mg/g when the Ni2+ doping content is 3 at.%. The improved desulfurization performance was attributed to the decreased grain sizes of ZnO nanoparticles and the increased numbers of Lewis acid sites on its surface, the former affords more active sites towards H2S removal and the latter promoted the dissociation of H2S through acid-base reaction. It also found that Ni2+ doping has a negative effect on the regeneration performance of ZnO adsorbents. The incomplete regeneration of ZnS plus the collapse of adsorbents’ framework structure and the formation of sulfates during the regeneration process are responsible for its inferior regeneration performance.
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