耐焦掺杂钴/介孔氧化铝催化剂在甲烷干转化过程中制氢

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute Pub Date : 2025-04-19 DOI:10.1016/j.joei.2025.102116

Bui T. Thu-Thao , Ngoc-Dung Lai , Ponnusamy Senthil Kumar , Tan Ji Siang , Thuy-Phuong T. Pham , Natarajan Rajamohan , Shams Forruque Ahmed , G. Abdulkareem-Alsultan , Aishah Abdul Jalil , Mohammad Yusuf , Dai-Viet N. Vo

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引用次数: 0

摘要

甲烷的干重整，DRM被广泛认为是一种有前途的H2能源替代化石燃料的途径。在化学计量DRM进料组成和650 ~ 750℃条件下，研究了镨掺杂（0 ~ 7 wt %）对介孔氧化铝（MA）分散Co催化剂性能和抗结焦性能的促进作用。Pr的促进使Co3O4晶粒尺寸从16.8 nm减小到7.8 nm，其中5Pr10Co/MA的Co3O4晶粒尺寸最小。Pr的加入使碱基总浓度由66.8 μmol CO2 gcat−1提高到169.7 μmol CO2 gcat−1。在Pr促进的催化剂（1% ~ 5% Pr）上，由于提高了碱基浓度和CO2的吸附，CH4的转化率稳定且随时间变化。值得注意的是，在700°C时，5Pr10Co/MA的CH4转化率最高（90.91%），CO2转化率最高（82.13%），由于Co3O4晶粒尺寸、氧空位和氧化还原属性最小，5Pr10Co/MA的碳沉积率最低（0.87%），碳生成率最低（2.42 × 10−5 gcarbongcat−1 min−1）。当温度从650℃升高到750℃时，5Pr10Co/MA的H2产率从52.52%提高到87.94%。本文还阐述了氧化还原PrO2/Pr2O3对两步抑制焦炭的机理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Hydrogen production from methane dry reforming on coke-resistant Pr-doped Co/mesoporous alumina catalysts

查看原文本刊更多论文

Hydrogen production from methane dry reforming on coke-resistant Pr-doped Co/mesoporous alumina catalysts

Dry reforming of methane, DRM is largely recognized as a promising route for generating H₂ energy to substitute fossil fuels. In this work, the promotional effect of praseodymium dopant (0-7 wt %) on the performance and coking resistance of mesoporous alumina (MA)-dispersed Co catalysts was investigated at a stoichiometric DRM feed composition and 650–750 °C. Pr promotion considerably reduced Co₃O₄ crystal dimension from 16.8 to 7.8 nm and 5Pr10Co/MA possessed the smallest Co₃O₄ crystallite size. The total basic site concentration was boosted with Pr addition from 66.8 to 169.7 μmol CO₂

g_{c a t}^{- 1}

. Stable CH₄ conversion with time-on-stream was evidenced on Pr-promoted catalysts (1 %-5 %Pr) because of enhancing basic site concentration and CO₂ adsorption. Notably, 5Pr10Co/MA achieved the greatest CH₄ (90.91 %) and CO₂ (82.13 %) conversions at 700 °C and exhibited the highest coke resistance with the least carbon deposition percentage (0.87 %) and carbon formation rate (2.42 × 10⁻⁵

g_{c a r b o n} g_{c a t}^{- 1}

min⁻¹) owing to the smallest Co₃O₄ crystallite size, oxygen vacancy and redox attributes. An enhancement in H₂ yield from 52.52 % to 87.94 % was evidenced on 5Pr10Co/MA with rising temperature from 650 to 750 °C. The two-step mechanism for coke suppression triggered by a redox PrO₂/Pr₂O₃ pair was also elaborated in this study.

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来源期刊

Journal of The Energy Institute 工程技术-能源与燃料

CiteScore

10.60

自引率

5.30%

发文量

166

审稿时长

16 days

期刊介绍： The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.