Chemistry methods : new approaches to solving problems in chemistry最新文献_第2页

Operando Luminescence Thermometry of a Solid Catalyst in a Reactor during a High-Temperature Chemical Process 高温化学过程中反应器中固体催化剂的操作发光测温仪

IF 6.1

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2025-01-21 DOI: 10.1002/cmtd.202400044

Daniël W. Groefsema, Dr. Freddy T. Rabouw, Michiel Boele, Dr. Alexander P. van Bavel, Prof. Dr. Bert M. Weckhuysen

{"title":"Operando Luminescence Thermometry of a Solid Catalyst in a Reactor during a High-Temperature Chemical Process","authors":"Daniël W. Groefsema, Dr. Freddy T. Rabouw, Michiel Boele, Dr. Alexander P. van Bavel, Prof. Dr. Bert M. Weckhuysen","doi":"10.1002/cmtd.202400044","DOIUrl":"https://doi.org/10.1002/cmtd.202400044","url":null,"abstract":"In most catalytic processes, thermal energy is released or consumed locally in a reactor due to the exothermicity or endothermicity of the chemical reactions. This causes the actual operating temperature of the catalyst material to deviate from the reactor temperature, which can lead to underperformance, reduced catalyst stability, or even thermal runaway. Conventional methods to measure the catalyst temperature, with a thermocouple in the reactor oven or in the catalyst bed, suffer from complications because of separation between the sensor and catalyst material, chemical activity of the thermocouple/coating material, added complexity of the setup, and disruption of the reactant flow and heat flow through the catalyst bed. Here, we show the possibilities and challenges of luminescence thermometry as an analytical technique for remote temperature monitoring of the local catalyst temperature in a strongly exothermic high-temperature reaction environment. We observe that the luminescence lifetime depends not only temperature, but also on oxygen concentration, which can introduce a significant systematic error of up to 40 °C in the recorded temperature. In the case of ratiometric luminescence thermometry, this error is strongly reduced to ~5 °C. We use the ratiometric technique to confirm its applicability in the exothermic oxidative coupling of methane (OCM) process at high reaction temperatures, showing an exothermic increase in the local catalyst temperature of up to 100 °C, relative to the constant reactor temperature under inert conditions.","PeriodicalId":72562,"journal":{"name":"Chemistry methods : new approaches to solving problems in chemistry","volume":"5 3","pages":""},"PeriodicalIF":6.1,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cmtd.202400044","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143582096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimised Synthesis of Rhombic dodecahedral Cu2O Nanoparticles: A Pathway to Superior Morphological Control 菱形十二面体 Cu2O 纳米粒子的优化合成：实现卓越形态控制的途径

IF 6.1

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2025-01-21 DOI: 10.1002/cmtd.202400050

Lorenzo Sarasino, Teruhisa Ohno, Maria Cristina Paganini

{"title":"Optimised Synthesis of Rhombic dodecahedral Cu2O Nanoparticles: A Pathway to Superior Morphological Control","authors":"Lorenzo Sarasino, Teruhisa Ohno, Maria Cristina Paganini","doi":"10.1002/cmtd.202400050","DOIUrl":"https://doi.org/10.1002/cmtd.202400050","url":null,"abstract":"Cuprous oxide (Cu2O) nanoparticles hold significant promise for photocatalytic applications due to their narrow bandgap and high surface reactivity. This study focuses on the synthesis of rhombic dodecahedral Cu2O (RD-Cu2O) nanoparticles, totally enclosed by {110} facets, known to exhibit superior photocatalytic performance over the other low-index crystallographic facets. The precise control over the synthesis conditions can significantly enhance the exposure of this highly active face and therefore improve the catalytic performance of Cu2O nanoparticles, making them superior for applications in pollutant degradation, organic reactions, and artificial photosynthesis. We systematically optimised the synthesis parameters, including reactants concentration, pH and other reaction conditions, to achieve a significant scale up of well-defined RD- Cu2O nanoparticles production, strictly necessary for the use of this photocatalyst on a larger scale. The optimised and scaled up synthesis require 2.0 mmol of CuCl2, 6.0 mmol of Sodium dodecyl sulphate (SDS), 9.6 mmol of NH2OH ⋅ HCl and 7.0 mmol of NaOH added in this order to 400 ml of water at 25 °C. The optimised nanoparticles demonstrated a narrow size distribution and a high degree of crystallographic control. Characterisation techniques such as FESEM, XRD, EPR, UV-Vis spectroscopy, and XPS confirmed the improved morphological and structural properties of the synthesised RD-Cu2O nanoparticles.","PeriodicalId":72562,"journal":{"name":"Chemistry methods : new approaches to solving problems in chemistry","volume":"5 4","pages":""},"PeriodicalIF":6.1,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cmtd.202400050","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

All-in-One Portable Electrochemical Strips for Drug Release, Delivery and Monitoring 用于药物释放、传递和监测的便携式电化学试纸条

IF 6.1

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2025-01-17 DOI: 10.1002/cmtd.202400079

Sima Singh, Mohga Khater, Ada Raucci, Ovidio Catanzano, Fabiana Quaglia, Stefano Cinti

引用次数: 0

Cover Picture: Quantifying the Site Heterogeneities of Non-Uniform Catalysts Using QuantEXAFS (Chem. Methods 1/2025) 封面图：使用QuantEXAFS定量非均匀催化剂的位点异质性（化学）。方法1/2025)

IF 6.1

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2025-01-10 DOI: 10.1002/cmtd.202580101

Rachita Rana, Jiyun Hong, Adam S. Hoffman, Baraa Werghi, Simon R. Bare, Ambarish R. Kulkarni

引用次数: 0

Albumin Folding Changes Affect the Microfluidic Interfacial Broadening Revealed by Surface Plasmon Resonance 白蛋白折叠变化影响表面等离子体共振显示的微流体界面展宽

IF 6.1

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2025-01-09 DOI: 10.1002/cmtd.202400034

Damiano Calcagno, Maria Luisa Perina, Alessia Distefano, Mariacristina Parravano, Antonino Licciardello, Nunzio Tuccitto, Giuseppe Grasso

{"title":"Albumin Folding Changes Affect the Microfluidic Interfacial Broadening Revealed by Surface Plasmon Resonance","authors":"Damiano Calcagno, Maria Luisa Perina, Alessia Distefano, Mariacristina Parravano, Antonino Licciardello, Nunzio Tuccitto, Giuseppe Grasso","doi":"10.1002/cmtd.202400034","DOIUrl":"https://doi.org/10.1002/cmtd.202400034","url":null,"abstract":"Understanding the conformation and diffusion behavior of proteins in biological fluids is crucial for advancements in conformational disease research. While several experimental techniques are available for probing protein conformations, they often come with limitations, such as the need for fluorophores or specific experimental conditions. Albumin, one of the most abundant proteins in the blood and used as a tear supplement in treating ocular surface disorders, plays a vital role as a transport protein, binding various ligands and facilitating their transport. However, the direct relationship between albumin conformation and diffusion coefficient (D) in water solutions remains unexplored. In this study, we describe a novel Surface Plasmon Resonance technique coupled with Stochastic Gillespie′s algorithm simulations to correlate albumin D values with its conformational states directly. Our findings demonstrate the feasibility of monitoring albumin conformational changes under different environmental conditions, as well as its degradation kinetics by trypsin, by analyzing its diffusion characteristics, presenting a promising avenue for advancing our understanding of conformational diseases.","PeriodicalId":72562,"journal":{"name":"Chemistry methods : new approaches to solving problems in chemistry","volume":"5 3","pages":""},"PeriodicalIF":6.1,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cmtd.202400034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143581842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Raman Study of Intermediates Formed During the Electrochemical N-Nitrosation of Secondary Amines 仲胺电化学n -亚硝化过程中中间体的拉曼研究

IF 6.1

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2025-01-05 DOI: 10.1002/cmtd.202400067

Scott Richardson, Dr. Rasool Babaahmadi, Dr. Lee E. Edwards, Rojan Ali, Prof. Dr. Rebecca L. Melen, Prof. Debdulal Roy, Prof. Dr. Thomas Wirth

引用次数: 0

Automated One-Pot Library Synthesis with Aldehydes as Radical Precursors 以醛为前体的自动化一锅文库合成

IF 6.1

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2024-12-20 DOI: 10.1002/cmtd.202400029

Adrián Luguera Ruiz, Brenda Pijper, Maria Lourdes Linares, Santiago Cañellas, Stefano Protti, Maurizio Fagnoni, Jesús Alcázar

引用次数: 0

Cover Picture: Analysis of Macromolecular Size Distributions in Concentrated Solutions (Chem. Methods 12/2024) 封面图：浓缩溶液中大分子尺寸分布的分析（化学）。方法12/2024)

IF 6.1

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2024-12-11 DOI: 10.1002/cmtd.202481201

Dr. Sumit K. Chaturvedi, Dr. Peter Schuck

引用次数: 0

Salt/Co-Crystal Discrimination Made Easy by 17O Solid-State NMR 17O固体核磁共振使盐/共晶判别变得容易

IF 6.1

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2024-12-10 DOI: 10.1002/cmtd.202400022

Ioana-Georgeta Grosu, Dinu Iuga, Ben P. Tatman, Maria O. Miclaus, Steven P. Brown, Claudiu Filip

{"title":"Salt/Co-Crystal Discrimination Made Easy by 17O Solid-State NMR","authors":"Ioana-Georgeta Grosu, Dinu Iuga, Ben P. Tatman, Maria O. Miclaus, Steven P. Brown, Claudiu Filip","doi":"10.1002/cmtd.202400022","DOIUrl":"https://doi.org/10.1002/cmtd.202400022","url":null,"abstract":"A 17O solid-state NMR method for salt/co-crystal discrimination in binary compounds of carboxylic acids is presented. The method incorporates a quick and relatively inexpensive labelling protocol for mechanochemical 17O enrichment of the carboxyl oxygen positions, as previously described by Metro et al. Angew. Chem. 2017, 56, 6803, followed by a visual interpretation of the recorded 17O solid-state magic-angle spinning (MAS) NMR spectra in terms of the nature of the enriched oxygen sites in the prepared binary compound. Care must be taken where variable-temperature changes in the 17O MAS spectra are observed. Nevertheless, we observe that, at low temperatures, the averaging effect of chemical exchange of the carboxyl/carboxylate moieties can be avoided and two well separated 17O lines are obtained for a carboxylic acid, whereas the almost equivalent carboxylate oxygen sites give rise to a single NMR signal. The method is illustrated in two cases, one in which salts can be identified also from their 1H solid-state NMR spectra by the absence of high ppm resonances due to hydrogen bonding, and another one, the more general case of organic crystals with multiple hydrogen bonding, where only 17O solid-state NMR spectra can be employed for salt/co-crystal discrimination. A quantitative analysis of 17O solid-state NMR spectral parameters can provide useful information in structural studies by NMR crystallography approaches.","PeriodicalId":72562,"journal":{"name":"Chemistry methods : new approaches to solving problems in chemistry","volume":"5 2","pages":""},"PeriodicalIF":6.1,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cmtd.202400022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantifying the Site Heterogeneities of Non-Uniform Catalysts Using QuantEXAFS 使用QuantEXAFS定量非均匀催化剂的位点非均质性

IF 6.1

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2024-11-21 DOI: 10.1002/cmtd.202400020

Rachita Rana, Jiyun Hong, Adam S. Hoffman, Baraa Werghi, Simon R. Bare, Ambarish R. Kulkarni

引用次数: 0