Surface Iron Species in Palladium–Iron Intermetallic Nanocrystals that Promote and Stabilize CO 2 Methanation

Autor:	Yizhou Dai, Yi Cui, Yulu Cao, Menglin Wang, Laihao Luo, Jun Bao, Wei-Xue Li, Jiaxin Wu, Ziyuan Chen, Jie Luo, Jie Zeng
Rok vydání:	2020
Předmět:	Materials science 010405 organic chemistry Intermetallic chemistry.chemical_element General Chemistry General Medicine 010402 general chemistry 01 natural sciences Mass activity Catalysis 0104 chemical sciences Metal Nanocrystal chemistry Chemical engineering Methanation visual_art visual_art.visual_art_medium High activity Palladium
Zdroj:	Angewandte Chemie. 132:14542-14550
ISSN:	1521-3757 0044-8249
Popis:	It is of pivotal importance to develop efficient catalysts and investigate the intrinsic mechanism for CO2 methanation. Now, it is reported that PdFe intermetallic nanocrystals afforded high activity and stability for CO2 methanation. The mass activity of fct-PdFe nanocrystals reached 5.3 mmol g-1 h-1 , under 1 bar (CO2 :H2 =1:4) at 180 °C, being 6.6, 1.6, 3.3, and 5.3 times as high as that of fcc-PdFe nanocrystals, Ru/C, Ni/C, and Pd/C, respectively. After 20 rounds of successive reaction, 98 % of the original activity was retained for PdFe intermetallic nanocrystals. Further mechanistic studies revealed that PdFe intermetallic nanocrystals enabled the maintenance of metallic Fe species via a reversible oxidation-reduction process in CO2 methanation. The metallic Fe in PdFe intermetallic nanocrystals induced the direct conversion of CO2 into CO* as the intermediate, contributing to the enhanced activity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::168a61c1c95db6eddb40b0b13de37c4b https://doi.org/10.1002/ange.201916032 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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