Herein, we report on low-temperature sulfur dioxide (SO₂) reduction to elemental sulfur via the coupling of nonthermal plasma (NTP) with supported transition metal sulfide catalysts in a dielectric barrier discharge (DBD) reactor. The transition metals include Mo, Fe, Co, Ni, Cu, and Zn. Combining NTP with supported metal sulfide catalysts significantly promotes low-temperature reduction of SO₂ by 148–200%, with over 98% selectivity to elemental sulfur. Over FeS₂/Al₂O₃ catalyst at low temperatures (<250 °C), temperature does not influence SO₂ conversion in the plasma catalytic process, whereas at higher temperatures, the reaction follows a similar trend as thermal catalysis. Strong synergistic effects are attained, as the sulfur yield is about 47–82% higher than the sum of the yield when using DBD-plasma and thermal catalysis separately. The physico−chemical properties of fresh and spent FeS₂/Al₂O₃ catalysts after thermal and plasma reactions are evaluated by N₂ physisorption, FESEM, XPS, XRD, HRTEM, STEM/EDS, and EELS to understand plasma and thermal effects on the catalyst. Our investigations reveal that running the reaction under plasma preserves the surface FeS₂ active phase, preventing its oxidation that otherwise occurs in the thermal catalysis process. Furthermore, plasma inhibits the thermal agglomeration of iron sulfide nanoparticles under reaction conditions.

在这里，我们报道了在介质阻挡放电（DBD）反应器中，通过将非热等离子体（NTP）与负载型过渡金属硫化物催化剂偶联，将低温二氧化硫（SO ₂）还原为元素硫。过渡金属包括Mo，Fe，Co，Ni，Cu和Zn。NTP与负载型金属硫化物催化剂的组合可显着促进SO ₂的低温降低148-200％，对元素硫的选择性超过98％。在低温（<250°C）下使用FeS ₂ / Al ₂ O ₃催化剂，温度不影响SO ₂在等离子催化过程中发生转化，而在较高温度下，反应遵循与热催化相似的趋势。由于硫的收率比分别使用DBD等离子体和热催化法的收率总和高约47-82％，因此获得了强大的协同效应。通过N ₂物理吸附，FESEM，XPS，XRD，HRTEM，STEM / EDS和EELS评估热和等离子体反应后新鲜的和用过的FeS ₂ / Al ₂ O ₃催化剂的理化性质，以了解其对等离子体和热的影响。催化剂。我们的研究表明，在等离子体下进行反应可保留表面FeS ₂活性相，防止其在热催化过程中发生氧化。此外，等离子体在反应条件下抑制了硫化铁纳米颗粒的热团聚。