Advances in nitrogen-rich carbon catalysts for selective catalytic oxidation of H2S

In recent years, selective catalytic oxidation (H2S-SCO) technology, which can efficiently purify H2S and recover sulfur resources, has received much attention. Research on the development of high-performance, high-selective, and low-cost catalysts is the focus of H2S-SCO technology, among which the nitrogen-rich carbon-based catalysts (RNCCs), which have the advantages of high activity, metal-free, easy-to-prepare, low cost, and easy to be regenerated, are considered as a class of highly promising catalysts for H2S-SCO. In this article, the development of metal-based catalysts is introduced, the preparation method, catalytic activity, and physical-chemical properties of RNCC are summarized and generalized, the structure-efficacy relationship of RNCC and the key factors affecting the performance of RNCC are systematically discussed, and the H2S-SCO reaction mechanism of RNCC is concluded. Finally, the current opportunities and challenges of RNCC are also pointed out, and the future development direction is envisioned. © 2024 Chinese Society for Environmental Sciences. All rights reserved.