Enhancing VOCs (o-xylene) oxidation with water resistance through plasma catalysis on Pt-CuO/Co3O4: Exploring the role of oxygen species

IF 6.7 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2025-05-21 DOI:10.1016/j.fuel.2025.135746

Pingting Gao , Shucheng Di , Erhao Gao , Wei Wang , Jiali Zhu , Shuiliang Yao , Jing Li , Zuliang Wu

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引用次数: 0

Abstract

Plasma catalysis is a powerful method for managing low-concentration volatile organic compounds (VOCs) emissions. We identified the optimal Cu/Co molar ratio (0.4) in CuO/Co₃O₄ catalysts via co-precipitation and added 0.1 wt% Pt to create the Pt-0.4CuO/Co₃O₄ catalyst for plasma catalytic oxidation of o-xylene. This catalyst nearly completely oxidized o-xylene at 1300 mg/m³ in a room-temperature dielectric barrier discharge reactor, achieving a COx selectivity of 99.35 % and an energy efficiency of 29.3 g/kWh under 160 J/L discharge conditions. Energy efficiency analysis showed that plasma triggered o-xylene dehydrogenation via active species (such as O and O₃), which is followed by deep oxidation driven by surface oxygen species (Co=O and Co-O-Co), O₂, and O₃. On the Pt-0.4CuO/Co₃O₄ catalyst, O₃ (and O) and O₂ contributed 54.3 % and 45.7 % to o-xylene oxidation, respectively. Pt incorporation to 0.4CuO/Co₃O₄ enhanced o-xylene conversion, COx selectivity, and the catalyst’s H₂O resistance and stability. Characterizations revealed that the Pt-0.4CuO/Co₃O₄ catalyst had the highest specific surface area and pore volume. CuO introduction induced more oxygen vacancies and O_ads, vital for performance. Operando plasma DRIFTS showed that the O atoms in Co=O and Co-O-Co on Co₃O₄ were reduced, which CuO and Pt incorporation could overcome this reduction due to their strong O₃ decomposition ability. CuO and Pt also served as an O-atom source for o-xylene oxidation·H₂O suppressed o-xylene and oxygen adsorption on Co₃O₄, lowering o-xylene conversion and COx selectivity. CuO and Pt incorporation mitigated this, enhancing oxygen adsorption and boosting o-xylene conversion and COx selectivity, thus improving the catalyst’s H₂O resistance.

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等离子体催化Pt-CuO/Co3O4增强VOCs（邻二甲苯）抗水氧化：氧的作用探讨

等离子体催化是一种控制低浓度挥发性有机化合物（VOCs）排放的有效方法。我们通过共沉淀法确定了CuO/Co3O4催化剂中Cu/Co的最佳摩尔比（0.4），并添加0.1 wt%的Pt制备了Pt-0.4CuO/Co3O4等离子体催化氧化邻二甲苯的催化剂。该催化剂在室温介质阻挡放电反应器中以1300 mg/m3氧化邻二甲苯，在160 J/L放电条件下，COx选择性达到99.35%，能效达到29.3 g/kWh。能量效率分析表明，等离子体通过活性物质（如O和O3）触发邻二甲苯脱氢，然后由表面氧（Co=O和Co-O-Co）、O2和O3驱动深度氧化。在Pt-0.4CuO/Co3O4催化剂上，O3（和O）和O2对邻二甲苯氧化的贡献率分别为54.3%和45.7%。Pt加入到0.4CuO/Co3O4中，提高了邻二甲苯转化率、COx选择性、催化剂的耐水性和稳定性。表征结果表明，Pt-0.4CuO/Co3O4催化剂具有最高的比表面积和孔隙体积。CuO的引入引起了更多的氧空位和负载，这对性能至关重要。Operando等离子体DRIFTS表明，Co3O4上Co=O和Co-O-Co中的O原子被还原，CuO和Pt的掺入可以克服这种还原，因为它们具有很强的O3分解能力。CuO和Pt也作为o原子源氧化邻二甲苯·H2O抑制邻二甲苯和氧在Co3O4上的吸附，降低邻二甲苯转化率和COx选择性。CuO和Pt的掺入减轻了这种情况，增强了氧吸附，提高了邻二甲苯的转化率和COx的选择性，从而提高了催化剂的耐水性能。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.