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Ammonia Decomposition over Iron Phthalocyanine‐Based Materials
Author(s) -
Tüysüz Harun,
Schüth Ferdi,
Zhi Linjie,
Müllen Klaus,
Comotti Massimiliano
Publication year - 2015
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201500024
Subject(s) - catalysis , phthalocyanine , decomposition , materials science , nickel , nitrogen , ammonia , chemical engineering , characterization (materials science) , inorganic chemistry , chemistry , organic chemistry , nanotechnology , metallurgy , engineering
Iron phthalocyanine‐based materials have been used herein as efficient catalysts for the ammonia decomposition reaction. These materials showed high activity, even superior to that showed by the commercial nickel‐based catalyst and iron‐doped carbon nanotubes, which were used as benchmarks in this study. Catalyst stability under reaction conditions appeared satisfactory, because no deactivation phenomena were observed. The type of the phthalocyanine precursor did not affect the catalytic performance; however, the preparation method had a strong effect. If the resulting material was exposed to the reaction conditions, some structural modification occurred. No clear correlation between phase composition and activity could be established because similar nitrogen content and similar crystalline domains in the sample led to different behaviors. However, the results of extensive characterization suggested that catalytic activities and conversion profiles were most likely dependent on material textural properties and thus on the preparation method used. The accessibility of iron species seems to be limited for catalysts prepared under vacuum. These phenomena are most likely responsible for the activation profile and for the low catalytic activity typical of these materials. In contrast, higher accessibility of iron species, typical of materials prepared under argon, would lead to improved and stable catalytic performance.

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