Shibashish D. Jaydev, Antonio J. Martín, David Garcia, Katia Chikri, Javier Pérez-Ramírez
{"title":"Assessment of transport phenomena in catalyst effectiveness for chemical polyolefin recycling","authors":"Shibashish D. Jaydev, Antonio J. Martín, David Garcia, Katia Chikri, Javier Pérez-Ramírez","doi":"10.1038/s44286-024-00108-3","DOIUrl":"10.1038/s44286-024-00108-3","url":null,"abstract":"Since the dawn of agitated brewing in the Paleolithic era, effective mixing has enabled efficient reactions. Emerging catalytic chemical polyolefin recycling processes present unique challenges, considering that the polymer melt has a viscosity three orders of magnitude higher than that of honey. The lack of protocols to achieve effective mixing may have resulted in suboptimal catalyst effectiveness. In this study, we have tackled the hydrogenolysis of commercial-grade high-density polyethylene and polypropylene to show how different stirring strategies can create differences of up to 85% and 40% in catalyst effectiveness and selectivity, respectively. The reaction develops near the H2–melt interface, with the extension of the interface and access to catalyst particles the main performance drivers. Leveraging computational fluid dynamics simulations, we have identified a power number of 15,000–40,000 to maximize the catalyst effectiveness factor and optimize stirring parameters. This temperature- and pressure-independent model holds across a viscosity range of 1–1,000 Pa s. Temperature gradients may quickly become relevant for reactor scale-up. The importance of optimizing the contact between catalyst particles, hydrogen and plastic melt in polyolefin chemical recycling has been overlooked, leading to suboptimal performance. The authors develop a criterion based on the dimensionless power number to optimize catalyst effectiveness. Stirring conditions can now be selected to treat commercial-grade polyethylene and polypropylene.","PeriodicalId":501699,"journal":{"name":"Nature Chemical Engineering","volume":"1 9","pages":"565-575"},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44286-024-00108-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142313447","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}
{"title":"Illuminating pathways for nanoparticle superlattice self-assembly","authors":"Taylor J. Woehl","doi":"10.1038/s44286-024-00104-7","DOIUrl":"10.1038/s44286-024-00104-7","url":null,"abstract":"The final structure of nanoparticle self-assembly intimately depends on the assembly pathway, which has remained obscure due to a lack of sufficiently high-spatiotemporal-resolution direct imaging approaches. Now, combining liquid-cell transmission electron microscopy with molecular dynamics simulations uncovers the complete dynamics of solvent-dependent assembly and phase transitions of nanocube superlattices.","PeriodicalId":501699,"journal":{"name":"Nature Chemical Engineering","volume":"1 8","pages":"504-505"},"PeriodicalIF":0.0,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141986155","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}
{"title":"A mathematical argument for teaching faculty","authors":"Robert H. Davis","doi":"10.1038/s44286-024-00100-x","DOIUrl":"10.1038/s44286-024-00100-x","url":null,"abstract":"Robert H. Davis argues quantitatively how hiring more teaching faculty could boost both research and teaching.","PeriodicalId":501699,"journal":{"name":"Nature Chemical Engineering","volume":"1 8","pages":"552-552"},"PeriodicalIF":0.0,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141986148","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}
{"title":"Timing the electricity market","authors":"Mo Qiao","doi":"10.1038/s44286-024-00113-6","DOIUrl":"10.1038/s44286-024-00113-6","url":null,"abstract":"","PeriodicalId":501699,"journal":{"name":"Nature Chemical Engineering","volume":"1 8","pages":"498-498"},"PeriodicalIF":0.0,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141986136","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}
{"title":"Scalable graphene current collectors for enhanced thermal management in batteries","authors":"","doi":"10.1038/s44286-024-00105-6","DOIUrl":"10.1038/s44286-024-00105-6","url":null,"abstract":"A protocol is demonstrated for the fabrication of dense and defect-free graphene current collectors on the hundred-meter scale. Owing to their high thermal conductivity and dense structures, these current collectors effectively prevent thermal runaway in high-energy pouch cells through the dissipation of localized heat and circumvention of undesirable side reactions, enhancing battery safety.","PeriodicalId":501699,"journal":{"name":"Nature Chemical Engineering","volume":"1 8","pages":"506-507"},"PeriodicalIF":0.0,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141986129","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}
{"title":"A refuel for heavy-duty transportation","authors":"Yanfei Zhu","doi":"10.1038/s44286-024-00111-8","DOIUrl":"10.1038/s44286-024-00111-8","url":null,"abstract":"","PeriodicalId":501699,"journal":{"name":"Nature Chemical Engineering","volume":"1 8","pages":"497-497"},"PeriodicalIF":0.0,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141986140","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}
{"title":"Chemical engineering, broadly speaking","authors":"","doi":"10.1038/s44286-024-00120-7","DOIUrl":"10.1038/s44286-024-00120-7","url":null,"abstract":"In this Editorial, we discuss how a broad chemical engineering journal can serve the community.","PeriodicalId":501699,"journal":{"name":"Nature Chemical Engineering","volume":"1 8","pages":"495-495"},"PeriodicalIF":0.0,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44286-024-00120-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141986152","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}
{"title":"A chemical reservoir computer","authors":"Alessio Lavino","doi":"10.1038/s44286-024-00109-2","DOIUrl":"10.1038/s44286-024-00109-2","url":null,"abstract":"","PeriodicalId":501699,"journal":{"name":"Nature Chemical Engineering","volume":"1 8","pages":"496-496"},"PeriodicalIF":0.0,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141986150","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}
{"title":"Oscillating chemical reaction networks stopped cold","authors":"Wilhelm T. S. Huck","doi":"10.1038/s44286-024-00092-8","DOIUrl":"10.1038/s44286-024-00092-8","url":null,"abstract":"The rates of all enzymatic reactions vary with temperature. Now, it is shown how this temperature sensitivity can be exploited to construct oscillating reaction networks that are able to detect temperature changes with remarkable precision.","PeriodicalId":501699,"journal":{"name":"Nature Chemical Engineering","volume":"1 8","pages":"499-500"},"PeriodicalIF":0.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141986151","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}
N. Lobato-Dauzier, A. Baccouche, G. Gines, T. Levi, Y. Rondelez, T. Fujii, S. H. Kim, N. Aubert-Kato, A. J. Genot
{"title":"Neural coding of temperature with a DNA-based spiking chemical neuron","authors":"N. Lobato-Dauzier, A. Baccouche, G. Gines, T. Levi, Y. Rondelez, T. Fujii, S. H. Kim, N. Aubert-Kato, A. J. Genot","doi":"10.1038/s44286-024-00087-5","DOIUrl":"10.1038/s44286-024-00087-5","url":null,"abstract":"Complex organisms perceive their surroundings with sensory neurons that encode physical stimuli into spikes of electrical activities. The past decades have seen a throve of computing approaches taking inspiration from neurons, including reports of DNA-based chemical neurons that mimic artificial neural networks with chemical reactions. Yet, they lack the physical sensing and temporal coding of sensory biological neurons. Here we report a thermosensory chemical neuron based on DNA and enzymes that spikes with chemical activity when exposed to cold. Surprisingly, this chemical neuron shares deep mathematical similarities with a toy model of a cold nociceptive neuron: they follow a similar bifurcation route between rest and oscillations and avoid artefacts associated with canonical bifurcations (such as irreversibility, damping or untimely spiking). We experimentally demonstrate this robustness by encoding—digitally and analogically—thermal messages into chemical waveforms. This chemical neuron could pave the way for implementing the third generation of neural network models (spiking networks) in DNA and opens the door for associative learning. Complex organisms perceive their surroundings with sensory neurons that encode physical stimuli into spikes of electrical activities. Here a thermosensory chemical neuron based on DNA and enzymes has been reported, which spikes with chemical activity when exposed to cold.","PeriodicalId":501699,"journal":{"name":"Nature Chemical Engineering","volume":"1 8","pages":"510-521"},"PeriodicalIF":0.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44286-024-00087-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141986154","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}
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
