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<p>Catalytic hydrolysis has been recognized as one of the most effective strategies for eliminating carbonyl sulfide (COS) from natural gas, a process that relies on strong adsorption capability and efficient molecular activation. Owing to the outstanding physicochemical properties of titanium dioxide (TiO<sub>2</sub>) in COS hydrolysis, bismuth (Bi) ions were incorporated into the TiO<sub>2</sub> framework to induce lattice distortions and defect-rich active centers. Moreover, Bi<sup>3+</sup> cations are generally regarded as weakly basic, and their interaction with surface O<sup>2−</sup> anions enhance the overall surface basicity, which contributes to superior COS elimination. In the next step, interlaced CuO nanosheets (NS-CuO) were fabricated using a scalable alcohol-mediated sol–gel approach, which then served as a structural support for the controlled anchoring of Bi-doped TiO<sub>2</sub> nanoparticles (3Bi-TiO<sub>2</sub>@NS-CuO) through an isoelectric-point-guided annealing route. The resulting heterojunction was deliberately engineered to accelerate charge carrier generation with excellent dynamics and efficient pathways. Under optimum experimental parameters, the 3Bi-TiO<sub>2</sub>@NS-CuO hybrid achieved full COS removal at 60&#xa0;°C and persevered stable activity for more than 30&#xa0;h without observable deactivation. The cooperation of Bi-TiO<sub>2</sub> and NS-CuO promoted effective water adsorption, activation, and dissociation, thereby generating abundant surface hydroxyl (–OH) groups, which were decisive for boosting hydrolysis at reduced temperatures. Overall, this work advances the understanding of heterogeneous catalytic systems for the deep elimination of complex organic sulfur pollutants, offering promising routes for practical low-temperature applications.</p> Graphical Abstract <p>Bi-doped TiO2 nanoparticles anchored on CuO nanosheets create defect-rich heterojunctions with enhanced surface basicity, accelerating COS hydrolysis at low temperatures. The 3Bi-TiO2@NS-CuO catalyst achieves complete COS removal with superior stability and selectivity, offering a promising strategy for efficient natural gas purification.</p> <p></p>

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Removal of Carbonyl Sulfur (COS) in Natural Gas via Catalytic Hydrolysis: Deposition of Bi-Doped TiO2 on Interlaced CuO Nanosheets

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Xiaoxia Li

摘要

Catalytic hydrolysis has been recognized as one of the most effective strategies for eliminating carbonyl sulfide (COS) from natural gas, a process that relies on strong adsorption capability and efficient molecular activation. Owing to the outstanding physicochemical properties of titanium dioxide (TiO2) in COS hydrolysis, bismuth (Bi) ions were incorporated into the TiO2 framework to induce lattice distortions and defect-rich active centers. Moreover, Bi3+ cations are generally regarded as weakly basic, and their interaction with surface O2− anions enhance the overall surface basicity, which contributes to superior COS elimination. In the next step, interlaced CuO nanosheets (NS-CuO) were fabricated using a scalable alcohol-mediated sol–gel approach, which then served as a structural support for the controlled anchoring of Bi-doped TiO2 nanoparticles (3Bi-TiO2@NS-CuO) through an isoelectric-point-guided annealing route. The resulting heterojunction was deliberately engineered to accelerate charge carrier generation with excellent dynamics and efficient pathways. Under optimum experimental parameters, the 3Bi-TiO2@NS-CuO hybrid achieved full COS removal at 60 °C and persevered stable activity for more than 30 h without observable deactivation. The cooperation of Bi-TiO2 and NS-CuO promoted effective water adsorption, activation, and dissociation, thereby generating abundant surface hydroxyl (–OH) groups, which were decisive for boosting hydrolysis at reduced temperatures. Overall, this work advances the understanding of heterogeneous catalytic systems for the deep elimination of complex organic sulfur pollutants, offering promising routes for practical low-temperature applications.

Graphical Abstract

Bi-doped TiO2 nanoparticles anchored on CuO nanosheets create defect-rich heterojunctions with enhanced surface basicity, accelerating COS hydrolysis at low temperatures. The 3Bi-TiO2@NS-CuO catalyst achieves complete COS removal with superior stability and selectivity, offering a promising strategy for efficient natural gas purification.