Heuntae Jo, Hee-Joon Chun, Junjung Rohmat Sugiarto, Muhammad Kashif Khan, Muhammad Irshad, Wonjoong Yoon, Seok Ki Kim, Jaehoon Kim
{"title":"通过二氧化碳加氢生产长链石蜡的钴结构演变","authors":"Heuntae Jo, Hee-Joon Chun, Junjung Rohmat Sugiarto, Muhammad Kashif Khan, Muhammad Irshad, Wonjoong Yoon, Seok Ki Kim, Jaehoon Kim","doi":"10.1016/j.apcatb.2024.124457","DOIUrl":null,"url":null,"abstract":"A new role of alkali metals in the direct hydrogenation of CO to C species over Co catalysts was proposed. During the CO hydrogenation, Na-promotion encouraged a new structural evolution (i.e., a thin oxygen vacancy (O)-rich CoO/CoC shell and a Co core). This facilitated the migration of CHO and CO species produced at the shell to the adjacent CoC shell and Co core, where they undergo further chain growth. In contrast, Li- and K-promotion resulted in the generation of a thick and O-poor CoO shell without CoC, while in the absence of alkali metal promotion, Co was exposed as the outmost surface; in both the cases, methanation dominated. The ability of Na-promotion to remove –OH* from the Co surface helped maintain the thickness and valance state of the Co oxide shell. Thus, the Na-promotion developed the chain growth and CO producing core–shell structure, rather than any electronic promotional effects.","PeriodicalId":516528,"journal":{"name":"Applied Catalysis B: Environment and Energy","volume":"13 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Structural evolution of cobalt for the production of long-chain paraffins by CO2 hydrogenation\",\"authors\":\"Heuntae Jo, Hee-Joon Chun, Junjung Rohmat Sugiarto, Muhammad Kashif Khan, Muhammad Irshad, Wonjoong Yoon, Seok Ki Kim, Jaehoon Kim\",\"doi\":\"10.1016/j.apcatb.2024.124457\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A new role of alkali metals in the direct hydrogenation of CO to C species over Co catalysts was proposed. During the CO hydrogenation, Na-promotion encouraged a new structural evolution (i.e., a thin oxygen vacancy (O)-rich CoO/CoC shell and a Co core). This facilitated the migration of CHO and CO species produced at the shell to the adjacent CoC shell and Co core, where they undergo further chain growth. In contrast, Li- and K-promotion resulted in the generation of a thick and O-poor CoO shell without CoC, while in the absence of alkali metal promotion, Co was exposed as the outmost surface; in both the cases, methanation dominated. The ability of Na-promotion to remove –OH* from the Co surface helped maintain the thickness and valance state of the Co oxide shell. Thus, the Na-promotion developed the chain growth and CO producing core–shell structure, rather than any electronic promotional effects.\",\"PeriodicalId\":516528,\"journal\":{\"name\":\"Applied Catalysis B: Environment and Energy\",\"volume\":\"13 1\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-07-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Applied Catalysis B: Environment and Energy\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1016/j.apcatb.2024.124457\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Catalysis B: Environment and Energy","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1016/j.apcatb.2024.124457","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
研究人员提出了碱金属在 Co 催化剂上将 CO 直接氢化为 C 物种过程中的新作用。在 CO 加氢过程中,Na 促进了新的结构演化(即富含氧空位 (O) 的薄 CoO/CoC 壳和 Co 核)。这促进了在外壳上产生的 CHO 和 CO 物种迁移到相邻的 CoC 外壳和 Co 内核,并在那里进行进一步的链增长。与此相反,锂和钾的促进作用导致生成厚而贫氧的 CoO 壳,但没有 CoC,而在没有碱金属促进作用的情况下,Co 暴露在最外面;在这两种情况下,甲烷化都占主导地位。Na 促进从 Co 表面去除 -OH* 的能力有助于保持氧化 Co 壳的厚度和价态。因此,Na 促进形成了链增长和产生 CO 的核壳结构,而不是任何电子促进效应。
Structural evolution of cobalt for the production of long-chain paraffins by CO2 hydrogenation
A new role of alkali metals in the direct hydrogenation of CO to C species over Co catalysts was proposed. During the CO hydrogenation, Na-promotion encouraged a new structural evolution (i.e., a thin oxygen vacancy (O)-rich CoO/CoC shell and a Co core). This facilitated the migration of CHO and CO species produced at the shell to the adjacent CoC shell and Co core, where they undergo further chain growth. In contrast, Li- and K-promotion resulted in the generation of a thick and O-poor CoO shell without CoC, while in the absence of alkali metal promotion, Co was exposed as the outmost surface; in both the cases, methanation dominated. The ability of Na-promotion to remove –OH* from the Co surface helped maintain the thickness and valance state of the Co oxide shell. Thus, the Na-promotion developed the chain growth and CO producing core–shell structure, rather than any electronic promotional effects.