Cu/Biochar Bifunctional Catalytic Removal of COS and H2S:H2O Dissociation and CuO Anchoring Enhanced by Pyridine N

• DOI: 10.1021/acs.est.3c08914
• Publication Date: 2024-03-01T18:45:41Z
• Authors: Xiang Li; Xueqian Wang; Li Yuan; Langlang Wang; Yixing Ma; Rui Cao; Yibing Xie; Yiran Xiong; Ping Ning
• Keywords: Anchoring

Economic and environmentally friendly strategies are needed to promote the bifunctional catalytic removal of carbonyl sulfide (COS) by hydrolysis hydrogen (H2S) oxidation. N doping is considered be an effective strategy, but essential intrinsic role dopants in catalysts still not well understood. Herein, conjugation urea biochar during Cu/biochar annealing produced pyridine N, which increased combined COS/H2S capacity catalyst from 260.7 374.8 mg·g–1 enhanced turnover frequency H2S 2.50 × 10–4 5.35 s–1. The nucleophilic nature enhances moderate basic sites catalyst, enabling attack protons strong H2O dissociation. Moreover, also forms cavity that anchor CuO, improving Cu dispersion generating more reactive oxygen species. By providing original insight into N-induced a slightly oxygenated humid atmosphere, this study offers valuable guidance for further C═S C–S bond-breaking degradation sulfur-containing pollutants.