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The development of adsorbents for gas desulfurization is highly essential to control sulfur dioxide emissions. In this article, CuO-modified SBA-15 and MOR-SBA-15 composite adsorbents were prepared by impregnation and post-grafting methods. As-prepared adsorbents were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy, and N2 adsorption–desorption methods. Furthermore, the adsorption desulfurization efficiency was investigated. The results proved that the impregnation method exhibited a remarkable dominance compared to the grafting method. The 8.7% CuO/MOR-SBA-15-imp adsorbent showed superior performance compared with other adsorbents in removing SO2 from the flue gas. Moreover, the 8.7%CuO/MOR-SBA-15-imp adsorbent illustrated an excellent regeneration for five cycles. The optimal condition for the flue gas desulfurization with the flow rate of 13 NL/h was 400 °C and a 200 mg adsorbent. Kinetic model studies showed that the model was pseudo-first order, and the amounts of activation energy for the 8.7% CuO/SBA-15-imp and 8.7% CuO/MOR-SBA-15-imp samples were 20.4 and 18.5 kJ/mol, respectively.

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