Recycling of spent lithium-ion batteries into SO2‑tolerant low temperature NH3-SCR catalyst

Abstract

Lithium-ion batteries will usher in a large-scale decommissioning wave, and how to resourcefully recycle spent lithium-ion batteries is a hot issue in today's environmental protection business. In this work, a catalyst with excellent catalytic activity and SO2 resistance was designed by modulating the morphology of the catalyst through the mixed solvent of water-polyethylene glycol using the spent lithium-ion batteries cathode materials, analyzed the impact of the ratio of water to polyethylene glycol on the anti-H2O, anti-SO2 and physicochemical properties of the catalysts. The NiCoMnOx-20PEG catalysts prepared when the polyethylene glycol: deionized water ratio was 1:3 showed a spherical structure assembled by needles and flakes, with smooth surfaces and uniform distribution, which resulted in stable catalysts and avoided pore clogging during the reaction process, and achieved near 100% NOx conversion at 80 ∼ 250 °C. The NOx conversion remained at 87.31% after 12 h of SO2 and H2O at 170 °C. The addition of polyethylene glycol can significantly delay the combination the sulfur dioxide and active sites and reduce the formation of sulfate, thus improving the catalyst's resistance to sulfur toxicity.