Roles of Na and SiO2 in improving the ammonia synthesis rate and cycling stability of Mo2N-based nitrogen carriers

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-03-27 DOI:10.1016/j.ijhydene.2025.03.346

Mengxuan Zhang , Feiyue Guan , Tuo Guo , Man Wu , Qingjie Guo

{"title":"Roles of Na and SiO2 in improving the ammonia synthesis rate and cycling stability of Mo2N-based nitrogen carriers","authors":"Mengxuan Zhang , Feiyue Guan , Tuo Guo , Man Wu , Qingjie Guo","doi":"10.1016/j.ijhydene.2025.03.346","DOIUrl":null,"url":null,"abstract":"<div><div>Chemical looping ammonia synthesis (CLAS) is a method for sustainable ammonia production under low temperatures and atmospheric pressure. The key to CLAS lies in the development of an efficient nitrogen carrier (NC). In this study, a composite NC with excellent ammonia synthesis performance and high cycling stability was investigated for CLAS using Na-modified Mo2N supported on SiO2. The results show that the Na/Mo2N/SiO2 NC achieves an impressive maximum ammonia synthesis rate of 4345 μmol g−1 h−1. The enhanced performance of the Na/Mo2N/SiO2 NC is attributed to the role of Na in accelerating the release rate of lattice nitrogen, whereas SiO2 improves NH3 selectivity. After 9 cycles under ambient pressure, the ammonia synthesis rate of the Na/Mo2N/SiO2 NC remained stable at approximately 854 μmol g−1 h−1 because Na and SiO2 facilitate the regeneration of Mo2N. Furthermore, SiO2 minimises the loss of the active component Na, thereby enhancing cycling stability. This study provides valuable insights into future research on NCs.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"120 ","pages":"Pages 497-506"},"PeriodicalIF":8.1000,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Hydrogen Energy","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S036031992501496X","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Chemical looping ammonia synthesis (CLAS) is a method for sustainable ammonia production under low temperatures and atmospheric pressure. The key to CLAS lies in the development of an efficient nitrogen carrier (NC). In this study, a composite NC with excellent ammonia synthesis performance and high cycling stability was investigated for CLAS using Na-modified Mo₂N supported on SiO₂. The results show that the Na/Mo₂N/SiO₂ NC achieves an impressive maximum ammonia synthesis rate of 4345 μmol g⁻¹ h⁻¹. The enhanced performance of the Na/Mo₂N/SiO₂ NC is attributed to the role of Na in accelerating the release rate of lattice nitrogen, whereas SiO₂ improves NH₃ selectivity. After 9 cycles under ambient pressure, the ammonia synthesis rate of the Na/Mo₂N/SiO₂ NC remained stable at approximately 854 μmol g⁻¹ h⁻¹ because Na and SiO₂ facilitate the regeneration of Mo₂N. Furthermore, SiO₂ minimises the loss of the active component Na, thereby enhancing cycling stability. This study provides valuable insights into future research on NCs.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.