In this study, nanoporous ZnO-Al2O3 mixed oxides (MO) were synthesized via a copolymer assisted self-assembly method and used as the catalyst support for the reactive adsorption desulfurization of model fuel. The as-synthesized Ni/ZnO-Al2O3 adsorbents were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, scanning electron microscopy (SEM), and H2-temperature programed reduction (TPR). Results revealed that with the increase in Ni loading, the Ni-Al2O3 interaction increases significantly compared with Zn-Al2O3, resulting in the ion exchange between Ni2+ and Zn2+ on alumina framework. This phenomenon affords free ZnO with high Ni concentration for higher sulfur capture capacity. Among tested adsorbents, 12%Ni/ZnO-Al2O3 showed the best desulfurization performance by achieving a breakthrough volume of up to 63 mL of a high sulfur concentration feed, corresponding to 108.8 mg S/g sulfur adsorption capacity, which is 76% higher than that of 7%Ni/ZnO-Al2O3 sample. Moreover, the RADS mechanism on Ni/ZnO-Al2O3 adsorbent is also proposed and discussed.
- Mixed oxide
- Reactive adsorptive desulfurization