Waste to worth: A high-temperature water-gas shift magnetite catalyst with encapsulated core-shell structure from coal fly ash
文献类型：期刊论文
| 作者 | Qian, Binbin; Yang, Sasha; Zhang, Jianghao ; Zhou, Song; Etschmann, Barbara; Liu, Cheng; Dai, Baiqian; Cashion, John; Wang, Yong; Wang, Huanting
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| 刊名 | FUEL PROCESSING TECHNOLOGY
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| 出版日期 | 2022-07 |
| 卷号 | 232期号:0页码:107265 |
| ISSN号 | 0378-3820 |
| 关键词 | IRON-BASED CATALYSTS FERRITE CATALYSTS AL REMOVAL OXIDES BULK CR CA CE |
| 英文摘要 | In this paper, we demonstrate the synthesis of magnetite-based, encapsulated catalyst with a core-shell structure from coal fly ash, an industrial solid waste, and its application to industrially important high temperature water-gas shift reaction (HT-WGSR). The catalyst precursor was first synthesized through a leaching-precipitation-hydrothermal process, leading to the formation of a nanosheet-like hematite precursor consisting of Fe3+ as primary element and minor cations including Al3+, Mg2+ and other cations (e.g. Ca2+ and Ti4+). During the WGSR, the nanosheets broke into smaller particles with a core of magnetite with a diameter of similar to 20 nm, whereas the inherent impurity elements were activated and migrated to the outer surface forming a shell with a thickness of similar to 4 nm. Due to the protection of shell, the as-synthesized catalyst exhibited improved activity, thermal stability and long-term durability for HT-WGSR at 400 degrees C and 450 degrees C. Compared to the pure hematite, this catalyst exhibited much higher activity and stability, i.e., increased CO conversion and decreased deactivation rate constant, by a factor of four and three, respectively. Additionally, through a bottom-up reverse synthesis, we have confirmed that Al3+ functioned as a textual promoter enhancing the interfacial area of the catalyst. On the other hand, the presence of minor impurity elements, in particular 2.58 wt% Mg2+ and 0.18 wt% Ti4+, were found to increase the basicity, and promote the adsorption rate of CO, the redox of catalysts, and the alteration of the reaction mechanism from regenerative to associative with the formation of a strong intermediate formate. This study not only opens a new direction on the valorization of solid waste into high-value catalysts, promoting the sustainability of solid waste management, but also provides an alternative, cost-effective and scalable approach for the design and fine-tuning of encapsulated catalysts. |
| 源URL | [https://ir.rcees.ac.cn/handle/311016/47431]  |
| 专题 | 生态环境研究中心_大气污染控制中心 |
| 通讯作者 | Zhang, Lian |
| 作者单位 | 1.Monash Univ, Dept Chem & Biol Engn, Wellington Rd, Clayton, Vic 3800, Australia 2.Monash Univ, Sch Phys & Astron, Wellington Rd, Clayton, Vic 3800, Australia 3.Monash Univ, Sch Earth Atmosphere & Environm, Clayton, Vic 3800, Australia 4.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China 5.Yancheng Teachers Univ, Sch Chem & Environm Engn, Yancheng 224002, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qian, Binbin,Yang, Sasha,Zhang, Jianghao,et al. Waste to worth: A high-temperature water-gas shift magnetite catalyst with encapsulated core-shell structure from coal fly ash[J]. FUEL PROCESSING TECHNOLOGY,2022,232(0):107265. |
| APA | Qian, Binbin.,Yang, Sasha.,Zhang, Jianghao.,Zhou, Song.,Etschmann, Barbara.,...&Zhang, Lian.(2022).Waste to worth: A high-temperature water-gas shift magnetite catalyst with encapsulated core-shell structure from coal fly ash.FUEL PROCESSING TECHNOLOGY,232(0),107265. |
| MLA | Qian, Binbin,et al."Waste to worth: A high-temperature water-gas shift magnetite catalyst with encapsulated core-shell structure from coal fly ash".FUEL PROCESSING TECHNOLOGY 232.0(2022):107265. |
入库方式： OAI收割
来源：生态环境研究中心
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