Insights into carbon formation over molten salt-promoted NiO/Al2O3 during methane pyrolysis

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2024-03-14 DOI:10.1007/s42823-024-00700-w

Yangdong He, Xingsheng Jing, Li Qin, Dan Wang, Chen Wu, Mengying Liu, Mingkai Yang, Zeai Huang

引用次数: 0

Abstract

Pyrolysis of methane is a carbon-economic method to obtain valuable carbon materials and CO_x-free H₂, under the carbon peaking and carbon neutrality goals. In this work, we propose a methane pyrolysis process to produce graphite and H₂ using bubble column reactor containing NiO/Al₂O₃ and NaCl–KCl (molten salt). The process was optimized by the different amounts of NaCl–KCl, the CH₄/Ar ratio and temperature, indicating that the CH₄ conversation rate could reach 92% at 900 °C. Meanwhile, we found that the addition of molten salt could obtain pure carbon materials, even if the conversation rate of CH₄ decreases. The analysis of the carbon products revealed that graphite could be obtained.

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甲烷热解过程中在熔盐促进的 NiO/Al2O3 上形成碳的启示

在碳峰值和碳中和的目标下，甲烷热解是一种获得有价值碳材料和无二氧化碳 H2 的碳经济方法。在这项工作中，我们提出了一种利用含有 NiO/Al2O3 和 NaCl-KCl（熔盐）的气泡柱反应器生产石墨和 H2 的甲烷热解工艺。通过不同的 NaCl-KCl 用量、CH4/Ar 比率和温度对该工艺进行了优化，结果表明，在 900 °C 时，CH4 的转化率可达 92%。同时，我们发现即使 CH4 的转化率降低，加入熔盐也能获得纯碳材料。对碳产物的分析表明，可以获得石墨。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.