{"title":"Enhancement effect of gallium modified CuMgAl spinel on the production of high-purity H2 by methanol steam reforming","authors":"Yuan Wei, Qiuwan Shen, Zhaoyang Zhang, Gaokui Chen, Xin Zhang, Shian Li","doi":"10.1111/jace.20510","DOIUrl":null,"url":null,"abstract":"<p>In the hydrogen production technology from methanol steam reforming (MSR) as a hydrogen source for proton exchange membrane fuel cells (PEMFCs), the toxic effect of CO in the feed gas on the fuel cell is an important issue. In this study, Ga was innovatively introduced into Cu<sub>0.75</sub>Mg<sub>0.25</sub>Al<sub>2</sub>O<sub>4</sub> spinel to modify the hydrogen purity and low CO selectivity of the hydrogen source for hydrogen production. First, the different Ga doping content in B site was synthesized, and the properties of the catalysts were characterized by X-ray powder diffractometer (XRD), scanning electron, microscope (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and brunner−emmet−teller (BET) techniques, as well as the MSR catalytic performance, was deeply explored. The SEM results indicate that the surface of Cu<sub>0.75</sub>Mg<sub>0.25</sub>Ga<sub>0.2</sub>Al<sub>1.8</sub>O<sub>4</sub> has a unique coagulation and stacking structure. BET analysis shows that it has a larger specific surface area. XPS results show the presence of oxygen vacancies. The reduction of CO production is attributed to the existence of oxygen vacancy, which improves the adsorption capacity of reactive oxygen species and promotes the migration of lattice oxygen. By optimizing of reaction conditions, including temperature, ratio of water and methanol (W/M), and liquid hourly space velocity on the catalytic performance, it was found that Cu<sub>0.75</sub>Mg<sub>0.25</sub>Ga<sub>0.2</sub>Al<sub>1.8</sub>O<sub>4</sub> has the best performance, with a methanol conversion rate as high as 100% and CO selectivity is 0. Furthermore, 50-h stability test results indicate that Cu<sub>0.75</sub>Mg<sub>0.25</sub>Ga<sub>0.2</sub>Al<sub>1.8</sub>O<sub>4</sub> has good stability, and the CO selectivity was almost 0. This study states that the doping of Ga modifies the catalytic performance of CuMgAl spinel; therefore, the Cu<sub>0.75</sub>Mg<sub>0.25</sub>Ga<sub>0.2</sub>Al<sub>1.8</sub>O<sub>4</sub> synthesized in this article is a promising MSR catalyst that can provide a stable high concentration hydrogen source for PEMFC.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 7","pages":""},"PeriodicalIF":3.5000,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the American Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/jace.20510","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 0
Abstract
In the hydrogen production technology from methanol steam reforming (MSR) as a hydrogen source for proton exchange membrane fuel cells (PEMFCs), the toxic effect of CO in the feed gas on the fuel cell is an important issue. In this study, Ga was innovatively introduced into Cu0.75Mg0.25Al2O4 spinel to modify the hydrogen purity and low CO selectivity of the hydrogen source for hydrogen production. First, the different Ga doping content in B site was synthesized, and the properties of the catalysts were characterized by X-ray powder diffractometer (XRD), scanning electron, microscope (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and brunner−emmet−teller (BET) techniques, as well as the MSR catalytic performance, was deeply explored. The SEM results indicate that the surface of Cu0.75Mg0.25Ga0.2Al1.8O4 has a unique coagulation and stacking structure. BET analysis shows that it has a larger specific surface area. XPS results show the presence of oxygen vacancies. The reduction of CO production is attributed to the existence of oxygen vacancy, which improves the adsorption capacity of reactive oxygen species and promotes the migration of lattice oxygen. By optimizing of reaction conditions, including temperature, ratio of water and methanol (W/M), and liquid hourly space velocity on the catalytic performance, it was found that Cu0.75Mg0.25Ga0.2Al1.8O4 has the best performance, with a methanol conversion rate as high as 100% and CO selectivity is 0. Furthermore, 50-h stability test results indicate that Cu0.75Mg0.25Ga0.2Al1.8O4 has good stability, and the CO selectivity was almost 0. This study states that the doping of Ga modifies the catalytic performance of CuMgAl spinel; therefore, the Cu0.75Mg0.25Ga0.2Al1.8O4 synthesized in this article is a promising MSR catalyst that can provide a stable high concentration hydrogen source for PEMFC.
期刊介绍：
The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials.
Papers on fundamental ceramic and glass science are welcome including those in the following areas:
Enabling materials for grand challenges[...]
Materials design, selection, synthesis and processing methods[...]
Characterization of compositions, structures, defects, and properties along with new methods [...]
Mechanisms, Theory, Modeling, and Simulation[...]
JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.
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