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Kinetic Control of Hexagonal Mg( OH ) 2 Nanoflakes for Catalytic Application of Preferential CO Oxidation
Author(s) -
Li Huixia,
Li Liping,
Chen Shaoqing,
Zhang Yuelan,
Li Guangshe
Publication year - 2017
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201600740
Subject(s) - catalysis , chemistry , ostwald ripening , kinetics , hydrothermal circulation , nanoparticle , nanocrystal , chemical engineering , morphology (biology) , nanotechnology , organic chemistry , materials science , physics , quantum mechanics , biology , engineering , genetics
Controlling the growth of nanocrystals is one of the most challenged issues in current catalytic field, which helps to further understand the size and morphology related behaviors for catalytic applications. In this work, we investigated the plane growth kinetics of Mg( OH ) 2 for catalytic application in preferential CO oxidation. Nanoflakes were synthesized through hydrothermal method. The morphology and structure of nanoflakes were characterized by TEM , SEM , and XRD . By varying the reaction temperature and time, Mg( OH ) 2 nanoflakes underwent an anisotropic growth. Benefited from the Ostwald ripening process, the thickness of nanoflake corresponding to the (110) plane of Mg( OH ) 2 was tuned from 7.6 nm to 24.0 nm, while the diameter of (001) plane increased from 18.2 nm to 30.2 nm. The grain growth kinetics for the thickness was well described in terms of an equation, D 5 = 7.6 5 + 6.9 × 10 8 exp(−28.14/ RT ). After depositing Pt nanoparticles onto these Mg( OH ) 2 nanoflakes, an excellent catalytic performance was achieved for preferential CO oxidation in H 2 ‐rich streams with a wide temperature window from 140 °C to 240 °C for complete CO conversion due to the interaction between Pt and hydroxyl groups. The findings reported here would be helpful in discovering novel catalysts for application of proton exchange membrane fuel cells.