Structural Modification of Ni/γ-Al2O3with Boron for Enhanced Carbon Resistance during CO Methanation

Autor:	Spyros N. Yannopoulos, Oliver Kröcher, Davide Ferri, Simone Pokrant, Daniel Rentsch, Anastasios Kambolis, Ye Lu
Rok vydání:	2015
Předmět:	Substitute natural gas Materials science Catalyst support Organic Chemistry Inorganic chemistry chemistry.chemical_element Catalysis law.invention Inorganic Chemistry Amorphous carbon chemistry Methanation law Calcination Physical and Theoretical Chemistry Boron Carbon
Zdroj:	ChemCatChem. 7:3261-3265
ISSN:	1867-3880
DOI:	10.1002/cctc.201500567
Popis:	Carbon deposition during CO methanation from biomass-derived gas is a significant challenge in terms of catalyst lifetime. It results from the severe reaction conditions imposed by the presence of unsaturated hydrocarbons in the gasified feedstock. This work investigated the structure of boron-modified Ni/Al2O3 catalysts exhibiting enhanced carbon resistance. As a consequence of B promoting the growth of Ni crystallites, the structure of the B-modified catalyst was demonstrated to be different at the nanoscale, especially after calcination. The modified catalyst possesses larger Ni particles with porous regions in which B is present. The absence of carbidic and amorphous carbon species, which are considered critical for catalyst deactivation in low-temperature processes, confirms that B effectively prevents carbon diffusion into Ni, which thus enhances the durability of the catalyst for CO methanation. These results may reveal a strategy of wider significance for developing catalysts with improved stability.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2267a3b25abaa8142378250716082750 https://doi.org/10.1002/cctc.201500567 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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