A critical review on direct catalytic hydrogasification of coal into CH4: catalysis process configurations, evaluations, and prospects

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2024-04-18 DOI:10.1007/s40789-024-00677-x
Shuai Yan, Jun Feng, Shenfu Yuan, Zihong Xia, Fengshuang Han, Xuan Qu, Jicheng Bi
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Abstract

Coal catalytic hydrogasification (CCHG) is a straightforward approach for producing CH4, which shows advantages over the mature coal-to-CH4 technologies from the perspectives of CH4 yield, thermal efficiency, and CO2 emission. The core of CCHG is to make carbon in coal convert into CH4 efficiently with a catalyst. In the past decades, intensive research has been devoted to catalytic hydrogasification of model carbon (pitch coke, activated carbon, coal char). However, the chemical process of CCHG is still not well understood because the coal structure is more complicated, and CCHG is a combination of coal catalytic hydropyrolysis and coal char catalytic hydrogasification. This review seeks to shed light on the catalytic process of raw coal during CCHG. The configuration of suitable catalysts, operating conditions, and feedstocks for tailoring CH4 formation were identified, and the underlying mechanisms were elucidated. Based on these results, the CCHG process was evaluated, emphasizing pollutant emissions, energy efficiency, and reactor design. Furthermore, the opportunities and strategic approaches for CCHG under the restraint of carbon neutrality were highlighted by considering the penetration of “green” H2, biomass, and CO2 into CCHG. Preliminary investigations from our laboratories demonstrated that the integrated CCHG and biomass/CO2 hydrogenation process could perform as an emerging pathway for boosting CH4 production by consuming fewer fossil fuels, fulfilling the context of green manufacturing. This work not only provides systematic knowledge of CCHG but also helps to guide the efficient hydrogenation of other carbonaceous resources such as biomass, CO2, and coal-derived wastes.

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煤直接催化加氢气化成甲烷的重要综述:催化工艺配置、评估和前景
煤催化加氢气化(CCHG)是一种生产甲烷(CH4)的直接方法,与成熟的煤制甲烷(CH4)技术相比,它在甲烷产量、热效率和二氧化碳排放等方面都具有优势。CCHG 的核心是通过催化剂使煤中的碳高效转化为 CH4。过去几十年来,人们一直致力于模型碳(沥青焦、活性炭、煤炭)的催化加氢气化研究。然而,由于煤的结构更为复杂,且 CCHG 是煤催化加氢分解和煤炭催化加氢气化的结合体,因此人们对 CCHG 的化学过程仍不甚了解。本综述旨在阐明 CCHG 过程中原煤的催化过程。确定了合适的催化剂配置、操作条件和原料,以定制 CH4 的形成,并阐明了其基本机理。基于这些结果,对 CCHG 过程进行了评估,重点是污染物排放、能源效率和反应器设计。此外,考虑到 "绿色 "H2、生物质和 CO2 在 CCHG 中的渗透,强调了在碳中和约束下 CCHG 的机遇和战略方法。我们实验室的初步研究表明,CCHG 和生物质/CO2 加氢综合工艺可作为一种新兴途径,通过消耗更少的化石燃料来提高 CH4 产量,从而实现绿色制造。这项工作不仅提供了有关 CCHG 的系统知识,还有助于指导生物质、二氧化碳和煤衍生废物等其他碳质资源的高效氢化。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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