Zhaohua Wang, Xuan Tang, Maolin Wang, Yao Xu, Xuetao Qin, Lihui Zhou, Mi Peng, Sheng Dai, Ding Ma
{"title":"Ce-promoted Ni-NiO small ensemble constrained in an MgO catalyst for efficient hydrogen production through NH3 decomposition","authors":"Zhaohua Wang, Xuan Tang, Maolin Wang, Yao Xu, Xuetao Qin, Lihui Zhou, Mi Peng, Sheng Dai, Ding Ma","doi":"10.1016/j.checat.2024.101000","DOIUrl":null,"url":null,"abstract":"<p>Ammonia is recognized for its potential in hydrogen storage and transportation. Among methods for hydrogen production from ammonia, catalytic decomposition stands out, and developing economical alternatives to noble metal catalysts like ruthenium (Ru) is crucial. Here, we report an exsolution strategy to obtain a size-constrained Ni<sup>0</sup>-NiO small ensemble on MgO that outperforms bare Ni single atoms and particles in ammonia decomposition. Adding Ce to the NiMg catalyst significantly enhances activity, doubling the hydrogen production rate to 92 mmol<sub>H2</sub> g<sub>cat</sub><sup>−1</sup> min<sup>−1</sup> at 550°C, surpassing most Ni-based catalysts. Characterization reveals the role of cerium in forming active Ni<sup>0</sup>-NiO ensembles by occupying specific sites on MgO. Cerium (Ce) also affects hydrogen and ammonia adsorption and alters reaction pathways. Our work highlights the structure control of transition metal sites and the promotion mechanism of rare-earth elements for ammonia conversion and hydrogen production reaction.</p>","PeriodicalId":53121,"journal":{"name":"Chem Catalysis","volume":null,"pages":null},"PeriodicalIF":11.5000,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chem Catalysis","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1016/j.checat.2024.101000","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Ammonia is recognized for its potential in hydrogen storage and transportation. Among methods for hydrogen production from ammonia, catalytic decomposition stands out, and developing economical alternatives to noble metal catalysts like ruthenium (Ru) is crucial. Here, we report an exsolution strategy to obtain a size-constrained Ni0-NiO small ensemble on MgO that outperforms bare Ni single atoms and particles in ammonia decomposition. Adding Ce to the NiMg catalyst significantly enhances activity, doubling the hydrogen production rate to 92 mmolH2 gcat−1 min−1 at 550°C, surpassing most Ni-based catalysts. Characterization reveals the role of cerium in forming active Ni0-NiO ensembles by occupying specific sites on MgO. Cerium (Ce) also affects hydrogen and ammonia adsorption and alters reaction pathways. Our work highlights the structure control of transition metal sites and the promotion mechanism of rare-earth elements for ammonia conversion and hydrogen production reaction.
期刊介绍:
Chem Catalysis is a monthly journal that publishes innovative research on fundamental and applied catalysis, providing a platform for researchers across chemistry, chemical engineering, and related fields. It serves as a premier resource for scientists and engineers in academia and industry, covering heterogeneous, homogeneous, and biocatalysis. Emphasizing transformative methods and technologies, the journal aims to advance understanding, introduce novel catalysts, and connect fundamental insights to real-world applications for societal benefit.