Investigation of Alternative Substances for Replacing Hydrogen in Methanation

IF 3 4区工程技术 Q3 ENERGY & FUELS

Energies Pub Date : 2024-07-26 DOI:10.3390/en17153690

Kazuhiro Yamamoto, Ryosuke Nakayama

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引用次数: 0

Abstract

Currently, a power-to-gas technology that obtains electrolytic hydrogen from renewable energy sources, synthesizes it with carbon dioxide, and converts it to methane has received a great deal of attention. It is called methanation, but there are few studies examining alternative substances to replace the raw material of hydrogen. Since hydrogen does not exist naturally, it is important to find other substances that react with carbon dioxide. We focus on flammable gases formed in oil refineries and petrochemical plants. In this study, based on chemical equilibrium calculations of the so-called NASA-CEA, we tested several gases including flammable and nonflammable gases by reacting them with carbon dioxide. Some of them are included in flare stacks. The reactants in the present gas conversion were H2O, CH3OH, C2H5OH, NH3, CH3CN, CH3N2CH3, C3H8O (1-propanol), C3H8O (2-propanol), C2H6, C2H4, C3H8, C3H6, C3H4 (allene), C3H4 (propine), C6H5OH, (CH3COOH)2, HCOOH, HF, HCl, HBr, H2S, HNO3, and SiH4. The results show that substances with more hydrogen atoms per mol of reactant, such as C3H8, CH3N2CH3, and SiH4, can produce more synthetic methane. One more finding is that graphite due to coking increases proportionately to the number of carbon atoms in the chemical formula.

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甲烷化过程中替代氢气的替代物质研究

目前，一种从可再生能源中获取电解氢气、与二氧化碳合成氢气并将其转化为甲烷的 "电转气 "技术受到了广泛关注。这种技术被称为甲烷化，但很少有研究探讨替代氢气原料的其他物质。由于氢在自然界并不存在，因此寻找能与二氧化碳发生反应的其他物质非常重要。我们的研究重点是炼油厂和石化厂形成的易燃气体。在这项研究中，根据所谓的 NASA-CEA 化学平衡计算，我们测试了几种气体，包括可燃和不可燃气体与二氧化碳的反应。其中一些气体包含在火炬烟囱中。本次气体转换的反应物为 H2O、CH3OH、C2H5OH、NH3、CH3CN、CH3N2CH3、C3H8O（1-丙醇）、C3H8O（2-丙醇）、C2H6、C2H4、C3H8、C3H6、C3H4（烯）、C3H4（丙）、C6H5OH、(CH3COOH)2、HCOOH、HF、HCl、HBr、H2S、HNO3 和 SiH4。结果表明，每摩尔反应物中含有更多氢原子的物质，如 C3H8、CH3N2CH3 和 SiH4，可以产生更多的合成甲烷。还有一项发现是，焦化产生的石墨与化学式中的碳原子数成正比增加。

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

Energies ENERGY & FUELS-

CiteScore

6.20

自引率

21.90%

发文量

8045

审稿时长

1.9 months

期刊介绍： Energies (ISSN 1996-1073) is an open access journal of related scientific research, technology development and policy and management studies. It publishes reviews, regular research papers, and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.