Moyu Liao , Ruofei Xiang , Xinwen Zhou , Zhongxu Dai , Li Wang , Hang Qin , Hanning Xiao
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Compared with the binary Cu–Al spinel, the Mn<sup>2+</sup> substitution led to a decrease in the particle size, a change in the chemical composition and reduction behavior, a decline in the acidity, an increase in the specific surface area, and an improvement in the surface chemical state. As a result, the release rate of active Cu from the Mn-containing CuAl<sub>2</sub>O<sub>4</sub> spinel was significantly slowed down and the formed nanoparticles were fine, which was believed to be in favor of maintaining a stable catalytic performance longer. Among the prepared catalysts, the monolithic catalyst loaded with Cu<sub>0.4</sub>Mn<sub>0.6</sub>Al<sub>2</sub>O<sub>4</sub> exhibited the highest activity and stability. The findings of this work suggested that introducing Mn<sup>2+</sup> might be a promising way to regulate the Cu releasing property for obtaining a better sustained release catalyst system.</p></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":null,"pages":null},"PeriodicalIF":9.0000,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Enhancing effect of Mn2+ substitution in CuAl2O4 spinel for methanol steam reforming in a microreactor\",\"authors\":\"Moyu Liao , Ruofei Xiang , Xinwen Zhou , Zhongxu Dai , Li Wang , Hang Qin , Hanning Xiao\",\"doi\":\"10.1016/j.renene.2024.120815\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Hydrogen generation via methanol steam reforming is a promising method for producing renewable energy. In this work, a series of Mn<sup>2+</sup>-substituted CuAl<sub>2</sub>O<sub>4</sub> spinels were prepared by solution combustion method, and the crystal structure, micromorphology, chemical constitution, reduction behavior, acidity, specific surface area and surface chemical state of the spinels were comprehensively characterized by various equipments. The obtained spinels were washcoated on Cu foams to prepare monolithic catalysts, and the catalytic performance of the catalysts was evaluated in a methanol steam reforming microreactor. Compared with the binary Cu–Al spinel, the Mn<sup>2+</sup> substitution led to a decrease in the particle size, a change in the chemical composition and reduction behavior, a decline in the acidity, an increase in the specific surface area, and an improvement in the surface chemical state. As a result, the release rate of active Cu from the Mn-containing CuAl<sub>2</sub>O<sub>4</sub> spinel was significantly slowed down and the formed nanoparticles were fine, which was believed to be in favor of maintaining a stable catalytic performance longer. Among the prepared catalysts, the monolithic catalyst loaded with Cu<sub>0.4</sub>Mn<sub>0.6</sub>Al<sub>2</sub>O<sub>4</sub> exhibited the highest activity and stability. The findings of this work suggested that introducing Mn<sup>2+</sup> might be a promising way to regulate the Cu releasing property for obtaining a better sustained release catalyst system.</p></div>\",\"PeriodicalId\":419,\"journal\":{\"name\":\"Renewable Energy\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":9.0000,\"publicationDate\":\"2024-06-14\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Renewable Energy\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0960148124008838\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENERGY & FUELS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Renewable Energy","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0960148124008838","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0
摘要
通过甲醇蒸汽转化制氢是一种很有前景的生产可再生能源的方法。本研究采用溶液燃烧法制备了一系列Mn2+取代的CuAl2O4尖晶石,并通过多种仪器对尖晶石的晶体结构、微观形貌、化学组成、还原行为、酸度、比表面积和表面化学态等进行了综合表征。将得到的尖晶石洗涂在铜泡沫上制备整体催化剂,并在甲醇蒸汽转化微反应器中评估了催化剂的催化性能。与二元 Cu-Al 尖晶石相比,Mn2+ 取代导致粒径减小、化学成分和还原行为发生变化、酸度下降、比表面积增大以及表面化学状态改善。因此,含锰 CuAl2O4 尖晶石中活性 Cu 的释放速度明显减慢,形成的纳米颗粒细小,这被认为有利于更长时间地保持稳定的催化性能。在制备的催化剂中,负载 Cu0.4Mn0.6Al2O4 的整体催化剂活性和稳定性最高。这项研究结果表明,引入 Mn2+ 可能是调节 Cu 释放特性以获得更好的缓释催化剂体系的一种可行方法。
Enhancing effect of Mn2+ substitution in CuAl2O4 spinel for methanol steam reforming in a microreactor
Hydrogen generation via methanol steam reforming is a promising method for producing renewable energy. In this work, a series of Mn2+-substituted CuAl2O4 spinels were prepared by solution combustion method, and the crystal structure, micromorphology, chemical constitution, reduction behavior, acidity, specific surface area and surface chemical state of the spinels were comprehensively characterized by various equipments. The obtained spinels were washcoated on Cu foams to prepare monolithic catalysts, and the catalytic performance of the catalysts was evaluated in a methanol steam reforming microreactor. Compared with the binary Cu–Al spinel, the Mn2+ substitution led to a decrease in the particle size, a change in the chemical composition and reduction behavior, a decline in the acidity, an increase in the specific surface area, and an improvement in the surface chemical state. As a result, the release rate of active Cu from the Mn-containing CuAl2O4 spinel was significantly slowed down and the formed nanoparticles were fine, which was believed to be in favor of maintaining a stable catalytic performance longer. Among the prepared catalysts, the monolithic catalyst loaded with Cu0.4Mn0.6Al2O4 exhibited the highest activity and stability. The findings of this work suggested that introducing Mn2+ might be a promising way to regulate the Cu releasing property for obtaining a better sustained release catalyst system.
期刊介绍:
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