Enhanced Hydrothermal Depolymerization with Fe/Ni Loaded C Catalysts for Improving Anaerobic Digestion Performance of Corn Stover

IF 3.9 4区工程技术 Q3 ENERGY & FUELS

Energies Pub Date : 2025-01-05 DOI:10.3390/en18010192

Xitong Wang, Chenyang Zhu, Hairong Yuan, Xiujin Li

{"title":"Enhanced Hydrothermal Depolymerization with Fe/Ni Loaded C Catalysts for Improving Anaerobic Digestion Performance of Corn Stover","authors":"Xitong Wang, Chenyang Zhu, Hairong Yuan, Xiujin Li","doi":"10.3390/en18010192","DOIUrl":null,"url":null,"abstract":"This research investigated the effects of hydrothermal depolymerization with Fe/Ni loaded C catalysts on the anaerobic digestion (AD) performance of corn stover (CS). CS was depolymerized at 140 °C for 20 min with Fe/C or Ni/C catalysts, and then anaerobically digested. The results showed that the biomethane yield with Fe/C-600 increased by 36.6% compared to that of the control. This increase could be attributed to effective CS depolymerization with catalysts (DC), indicated by modified structures of solid fraction and enriched available components of liquid fraction. SEM analyses showed that CS microphysical structure after DC was obviously disrupted, resulting in more accessibility of cellulose and hemicellulose. The crystallinity index (CrI) of depolymerized CS was significantly reduced from 32.5% to 23.5%, allowing for a more easily biodegradable non-crystalline area to be available for enzymes. Meanwhile, the DC group produced 4.7 times more reducing sugar (RS), and a 3.4 times increase in total volatile fatty acids (VFAs) as compared to the control. Furthermore, these enhancements in DC led to an increased relative abundance of cellulolytic bacteria (Hydrogenispora and Fermentimonas) and anaerobic methanogenic archaea (Methanosarcina) in following the AD process. This could explain the reason for the biomethane yield increase with DC from microbial perspectives. This study demonstrated that hydrothermal depolymerization with Fe/C or Ni/C could provide an effective approach for obtaining more biomethane from CS via AD.","PeriodicalId":11557,"journal":{"name":"Energies","volume":"18 1","pages":"192-192"},"PeriodicalIF":3.9000,"publicationDate":"2025-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.mdpi.com/1996-1073/18/1/192/pdf?version=1736062164","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Energies","FirstCategoryId":"0","ListUrlMain":"https://doi.org/10.3390/en18010192","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENERGY & FUELS","Score":null,"Total":0}

引用次数: 3

Abstract

This research investigated the effects of hydrothermal depolymerization with Fe/Ni loaded C catalysts on the anaerobic digestion (AD) performance of corn stover (CS). CS was depolymerized at 140 °C for 20 min with Fe/C or Ni/C catalysts, and then anaerobically digested. The results showed that the biomethane yield with Fe/C-600 increased by 36.6% compared to that of the control. This increase could be attributed to effective CS depolymerization with catalysts (DC), indicated by modified structures of solid fraction and enriched available components of liquid fraction. SEM analyses showed that CS microphysical structure after DC was obviously disrupted, resulting in more accessibility of cellulose and hemicellulose. The crystallinity index (CrI) of depolymerized CS was significantly reduced from 32.5% to 23.5%, allowing for a more easily biodegradable non-crystalline area to be available for enzymes. Meanwhile, the DC group produced 4.7 times more reducing sugar (RS), and a 3.4 times increase in total volatile fatty acids (VFAs) as compared to the control. Furthermore, these enhancements in DC led to an increased relative abundance of cellulolytic bacteria (Hydrogenispora and Fermentimonas) and anaerobic methanogenic archaea (Methanosarcina) in following the AD process. This could explain the reason for the biomethane yield increase with DC from microbial perspectives. This study demonstrated that hydrothermal depolymerization with Fe/C or Ni/C could provide an effective approach for obtaining more biomethane from CS via AD.

查看原文本刊更多论文

Fe/Ni负载C催化剂强化水热解聚提高玉米秸秆厌氧消化性能

研究了Fe/Ni负载C催化剂水热解聚对玉米秸秆厌氧消化（CS）性能的影响。CS在140℃下用Fe/C或Ni/C催化剂解聚20 min，然后厌氧消化。结果表明，与对照相比，添加Fe/C-600的生物甲烷产量提高了36.6%。这种增加可能归因于催化剂（DC）有效的CS解聚，表现为固体部分结构的改变和液体部分有效组分的丰富。SEM分析表明，经DC处理后的CS微物理结构被明显破坏，纤维素和半纤维素的可及性增强。解聚后的CS结晶度指数（CrI）从32.5%显著降低到23.5%，从而为酶提供了更容易生物降解的非结晶区域。同时，与对照组相比，DC组产生的还原糖（RS）增加了4.7倍，总挥发性脂肪酸（VFAs）增加了3.4倍。此外，这些DC的增强导致纤维素分解细菌（Hydrogenispora和Fermentimonas）和厌氧产甲烷古细菌（Methanosarcina）在AD过程后的相对丰度增加。这可以从微生物的角度解释生物甲烷产量增加的原因。该研究表明，Fe/C或Ni/C的水热解聚是通过AD从CS中获得更多生物甲烷的有效途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.