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Low quantum efficiency of μ-oxo iron bisporphyrin photoacatalysts explained with femtosecond M-edge XANES 用飞秒m边XANES解释了μ-氧铁双卟啉光催化剂的低量子效率
Catalysis Science & Technology Pub Date : 2021-12-22 DOI: 10.26434/chemrxiv-2021-x6q87
Kori Sye, Clare A Leahy, Josh Vura-Weis
{"title":"Low quantum efficiency of μ-oxo iron bisporphyrin photoacatalysts explained with femtosecond M-edge XANES","authors":"Kori Sye, Clare A Leahy, Josh Vura-Weis","doi":"10.26434/chemrxiv-2021-x6q87","DOIUrl":"https://doi.org/10.26434/chemrxiv-2021-x6q87","url":null,"abstract":"Bridged μ-oxo iron bisporphyrins serve as photocatalysts for oxidative organic transformations, but suffer from low quantum efficiency. We use femtosecond optical and M2,3-edge XANES spectroscopy to investigate the early photodynamics of the μ-oxo iron bisporphyrin, (TPPFe)2O, providing evidence for the preferential formation of an TPPFe(III)+/TPPFe(III)-O- ion pair state instead of the desired TPPFe(II)/TPPFe(IV)=O.","PeriodicalId":9643,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84589712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Sustainable nitrate production out of thin air: The photocatalytic oxidation of molecular nitrogen 从稀薄空气中可持续生产硝酸盐:分子氮的光催化氧化
Catalysis Science & Technology Pub Date : 2021-10-01 DOI: 10.33774/chemrxiv-2021-hljbh
A. Pashkova, Bastien O. Burek, J. Bloh
{"title":"Sustainable nitrate production out of thin air: The photocatalytic oxidation of molecular nitrogen","authors":"A. Pashkova, Bastien O. Burek, J. Bloh","doi":"10.33774/chemrxiv-2021-hljbh","DOIUrl":"https://doi.org/10.33774/chemrxiv-2021-hljbh","url":null,"abstract":"Novel processes for the sustainable production of fertilizers are highly sought after to combat climate change. Herein, we demonstrate that by irradiating with strong UVA-light, TiO2 is able to photocatalytically oxidize molecular nitrogen in the gas phase under ambient conditions to NOx and nitrate. The reaction produces predominantly nitrogen dioxide with a high selectivity of up to 93% which could be captured afterwards to produce nitric acid or nitrates and used as sustainable (solar) fertilizer.","PeriodicalId":9643,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88507901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Highly efficient and stable Ru nanoparticle electrocatalyst for the hydrogen evolution reaction in alkaline conditions 碱性条件下高效稳定的Ru纳米粒子析氢电催化剂
Catalysis Science & Technology Pub Date : 2021-08-30 DOI: 10.33774/chemrxiv-2021-2w10h
Frederik Søndergaard‐Pedersen, R. Tilley, J. J. Gooding, Tania M. Benedetti, Munkhshur Myekhlai, B. Iversen, E. Bøjesen, Harish Lakhotiya, Martin Bondesgaard
{"title":"Highly efficient and stable Ru nanoparticle electrocatalyst for the hydrogen evolution reaction in alkaline conditions","authors":"Frederik Søndergaard‐Pedersen, R. Tilley, J. J. Gooding, Tania M. Benedetti, Munkhshur Myekhlai, B. Iversen, E. Bøjesen, Harish Lakhotiya, Martin Bondesgaard","doi":"10.33774/chemrxiv-2021-2w10h","DOIUrl":"https://doi.org/10.33774/chemrxiv-2021-2w10h","url":null,"abstract":"Developing alternatives to platinum-based electrocatalysts for the hydrogen evolution reaction (HER) is an important challenge for realizing the green transition. This is especially the case for alkaline conditions where Pt-based catalysts have very poor stability. Here, we demonstrate new solvothermal synthesis methods with facile allotropism control for selectively obtaining hexagonal-close-packed (hcp) and face-centered cubic (fcc) ruthenium nanoparticles. Both samples are highly active HER catalysts in alkaline conditions outperforming commercial Pt/C. However, the samples show markedly different stabilities. The hcp sample shows exceptional stability for 12 hours constant operation at 10 mA/cm2 with an overpotential that only increases 6 mV whereas the fcc sample increases 50 mV and the commercial Pt/C more than 350 mV. Thus, this study underlines the importance of controlling the crystal structure of nanoparticle electrocatalysts and shows the potential of using Ru as an alternative to Pt in alkaline conditions.","PeriodicalId":9643,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78183530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Selective oxidation of substituted phenols with Co–N–C catalysts fabricated via low temperature heat treatment 低温热处理制备的Co-N-C催化剂对取代苯酚的选择性氧化
Catalysis Science & Technology Pub Date : 1900-01-01 DOI: 10.1039/d3cy00834g
Bairui Guo, Zhongtian Du, Xiaoyu Shen, Mengjing Han, Yanbin Zhao, Jingjie Luo, Changhai Liang
{"title":"Selective oxidation of substituted phenols with Co–N–C catalysts fabricated via low temperature heat treatment","authors":"Bairui Guo, Zhongtian Du, Xiaoyu Shen, Mengjing Han, Yanbin Zhao, Jingjie Luo, Changhai Liang","doi":"10.1039/d3cy00834g","DOIUrl":"https://doi.org/10.1039/d3cy00834g","url":null,"abstract":"Efficient heterogeneous Co(ii) species were fabricated via pyrolysis at 400 °C, rather than generally at 600–1000 °C.","PeriodicalId":9643,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88725340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Unravelling the chain growth mechanism in Cr/NNN-catalysed ethylene oligomerization Cr/ nnn催化乙烯低聚反应的链生长机制研究
Catalysis Science & Technology Pub Date : 1900-01-01 DOI: 10.1039/d3cy00954h
Jiale Peng, Mengyu Zhu, Long Chen, Z. Liu
{"title":"Unravelling the chain growth mechanism in Cr/NNN-catalysed ethylene oligomerization","authors":"Jiale Peng, Mengyu Zhu, Long Chen, Z. Liu","doi":"10.1039/d3cy00954h","DOIUrl":"https://doi.org/10.1039/d3cy00954h","url":null,"abstract":"A special and controversial Cr/NNN ethylene oligomerization system delivering oligomers in a Schulz-Flory distribution, which was suggested to follow a metallacycle mechanism, has been systematically investigated by means of density...","PeriodicalId":9643,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87219997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Screening of steam reforming catalysts using unsupervised machine learning 使用无监督机器学习筛选蒸汽重整催化剂
Catalysis Science & Technology Pub Date : 1900-01-01 DOI: 10.1039/d3cy00754e
Yujia Liu, Zhenwei Liang, Jiazhun Huang, Biqi Zhong, Xiaojun Yang, Tiejun Wang
{"title":"Screening of steam reforming catalysts using unsupervised machine learning","authors":"Yujia Liu, Zhenwei Liang, Jiazhun Huang, Biqi Zhong, Xiaojun Yang, Tiejun Wang","doi":"10.1039/d3cy00754e","DOIUrl":"https://doi.org/10.1039/d3cy00754e","url":null,"abstract":"An efficient catalyst is crucial for the production of hydrogen through methanol reforming. However, the current study of catalysts for this reaction primarily relies on time-consuming and labor-intensive experimental methods....","PeriodicalId":9643,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84367879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research progress of spinel CoFe2O4 as electrocatalysts for oxygen evolution reaction 尖晶石CoFe2O4作为析氧电催化剂的研究进展
Catalysis Science & Technology Pub Date : 1900-01-01 DOI: 10.1039/d3cy01013a
Hongxin Wang, Qiming Hu, Jiangyuan Qiu, Rui Guo, Xuanwen Liu
{"title":"Research progress of spinel CoFe2O4 as electrocatalysts for oxygen evolution reaction","authors":"Hongxin Wang, Qiming Hu, Jiangyuan Qiu, Rui Guo, Xuanwen Liu","doi":"10.1039/d3cy01013a","DOIUrl":"https://doi.org/10.1039/d3cy01013a","url":null,"abstract":"To satisfy the energy demand of modern society, seeking sustainable, clean and efficient energy production is claimed to be significant. Electrolytic water technology is an efficient and sustainable way to...","PeriodicalId":9643,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83886018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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