{"title":"反应诱导的不饱和羰基钼可提供高活性二氧化碳转化催化剂","authors":"Xingtao Sun, Jiafeng Yu, Habib Zada, Yu Han, Ling Zhang, Huaican Chen, Wen Yin, Jian Sun","doi":"10.1038/s41557-024-01628-4","DOIUrl":null,"url":null,"abstract":"<p>Sustainable CO<sub>2</sub> conversion is crucial in curbing excess emissions. Molybdenum carbide catalysts have demonstrated excellent performances for catalytic CO<sub>2</sub> conversion, but harsh carburization syntheses and poor stabilities make studies challenging. Here an unsaturated Mo oxide (Mo<sub>17</sub>O<sub>47</sub>) shows a high activity for the reverse water–gas shift reaction, without carburization pretreatments, and remains stable for 2,000 h at 600 °C. Flame spray pyrolysis synthesis and Ir promoter facilitate the formation of Mo<sub>17</sub>O<sub>47</sub> and its in situ carburization during reaction. The reaction-induced cubic α-MoC with unsaturated Mo oxycarbide (MoO<sub><i>x</i></sub>C<sub><i>y</i></sub>) on the surface serves as the active sites that are crucial for catalysis. Mechanistic studies indicate that the C atom in CO<sub>2</sub> inserts itself in the vacancy between two Mo atoms, and releases CO by taking another C atom from the oxycarbide to regenerate the vacancy, following a carbon cycle pathway. The design of Mo catalysts with unsaturated oxycarbide active sites affords new territory for high-temperature applications and provides alternative pathways for CO<sub>2</sub> conversion.</p><figure></figure>","PeriodicalId":18909,"journal":{"name":"Nature chemistry","volume":null,"pages":null},"PeriodicalIF":19.2000,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Reaction-induced unsaturated Mo oxycarbides afford highly active CO2 conversion catalysts\",\"authors\":\"Xingtao Sun, Jiafeng Yu, Habib Zada, Yu Han, Ling Zhang, Huaican Chen, Wen Yin, Jian Sun\",\"doi\":\"10.1038/s41557-024-01628-4\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Sustainable CO<sub>2</sub> conversion is crucial in curbing excess emissions. Molybdenum carbide catalysts have demonstrated excellent performances for catalytic CO<sub>2</sub> conversion, but harsh carburization syntheses and poor stabilities make studies challenging. Here an unsaturated Mo oxide (Mo<sub>17</sub>O<sub>47</sub>) shows a high activity for the reverse water–gas shift reaction, without carburization pretreatments, and remains stable for 2,000 h at 600 °C. Flame spray pyrolysis synthesis and Ir promoter facilitate the formation of Mo<sub>17</sub>O<sub>47</sub> and its in situ carburization during reaction. The reaction-induced cubic α-MoC with unsaturated Mo oxycarbide (MoO<sub><i>x</i></sub>C<sub><i>y</i></sub>) on the surface serves as the active sites that are crucial for catalysis. Mechanistic studies indicate that the C atom in CO<sub>2</sub> inserts itself in the vacancy between two Mo atoms, and releases CO by taking another C atom from the oxycarbide to regenerate the vacancy, following a carbon cycle pathway. The design of Mo catalysts with unsaturated oxycarbide active sites affords new territory for high-temperature applications and provides alternative pathways for CO<sub>2</sub> conversion.</p><figure></figure>\",\"PeriodicalId\":18909,\"journal\":{\"name\":\"Nature chemistry\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":19.2000,\"publicationDate\":\"2024-09-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Nature chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1038/s41557-024-01628-4\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nature chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1038/s41557-024-01628-4","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
可持续的二氧化碳转化对于抑制过量排放至关重要。碳化钼催化剂在催化二氧化碳转化方面表现出卓越的性能,但苛刻的渗碳合成和较差的稳定性使研究具有挑战性。在这里,一种不饱和氧化钼(Mo17O47)在水-气反向转化反应中表现出很高的活性,无需渗碳预处理,并且在 600 °C 下可保持稳定 2,000 小时。火焰喷射热解合成和 Ir 促进剂促进了 Mo17O47 的形成及其在反应过程中的原位渗碳。反应诱导生成的立方体 α-MoC 表面含有不饱和氧碳化钼 (MoOxCy),成为催化的关键活性位点。机理研究表明,二氧化碳中的 C 原子会插入两个 Mo 原子之间的空位,并通过从碳氧化合物中获取另一个 C 原子来重新生成空位,从而按照碳循环途径释放出二氧化碳。设计具有不饱和碳化氧活性位点的钼催化剂为高温应用提供了新的领域,并为二氧化碳的转化提供了替代途径。
Reaction-induced unsaturated Mo oxycarbides afford highly active CO2 conversion catalysts
Sustainable CO2 conversion is crucial in curbing excess emissions. Molybdenum carbide catalysts have demonstrated excellent performances for catalytic CO2 conversion, but harsh carburization syntheses and poor stabilities make studies challenging. Here an unsaturated Mo oxide (Mo17O47) shows a high activity for the reverse water–gas shift reaction, without carburization pretreatments, and remains stable for 2,000 h at 600 °C. Flame spray pyrolysis synthesis and Ir promoter facilitate the formation of Mo17O47 and its in situ carburization during reaction. The reaction-induced cubic α-MoC with unsaturated Mo oxycarbide (MoOxCy) on the surface serves as the active sites that are crucial for catalysis. Mechanistic studies indicate that the C atom in CO2 inserts itself in the vacancy between two Mo atoms, and releases CO by taking another C atom from the oxycarbide to regenerate the vacancy, following a carbon cycle pathway. The design of Mo catalysts with unsaturated oxycarbide active sites affords new territory for high-temperature applications and provides alternative pathways for CO2 conversion.
期刊介绍:
Nature Chemistry is a monthly journal that publishes groundbreaking and significant research in all areas of chemistry. It covers traditional subjects such as analytical, inorganic, organic, and physical chemistry, as well as a wide range of other topics including catalysis, computational and theoretical chemistry, and environmental chemistry.
The journal also features interdisciplinary research at the interface of chemistry with biology, materials science, nanotechnology, and physics. Manuscripts detailing such multidisciplinary work are encouraged, as long as the central theme pertains to chemistry.
Aside from primary research, Nature Chemistry publishes review articles, news and views, research highlights from other journals, commentaries, book reviews, correspondence, and analysis of the broader chemical landscape. It also addresses crucial issues related to education, funding, policy, intellectual property, and the societal impact of chemistry.
Nature Chemistry is dedicated to ensuring the highest standards of original research through a fair and rigorous review process. It offers authors maximum visibility for their papers, access to a broad readership, exceptional copy editing and production standards, rapid publication, and independence from academic societies and other vested interests.
Overall, Nature Chemistry aims to be the authoritative voice of the global chemical community.