The thiophene removal ability of the synthesized ZnNi/diatomite-pseudo-boehmite adsorbent was tested in a labscale fixed-bed reaction system.X-ray diffractograms(XRD) were used to characterize the adsorbent samples.The effects of Zn/Ni molar ratio,various model fuels and regeneration patterns on the RADS tests were studied.The adsorption mechanism was investigated by XRD and MS analyses.The results indicted that thiophene in the model fuel was first decomposed on the surface Ni of the adsorbent to form Ni3S2 while the hydrocarbon portion of the molecule was released back into the process stream,followed by reduction of Ni3S2 to form H2S in the presence of H2,and then H2S is stored in the adsorbent accompanied by the conversion of ZnO into ZnS.
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