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Morphology‐Tuned Activity of Ru/Nb 2 O 5 Catalysts for Ketone Reductive Amination
Author(s) -
Guo Wanjun,
Tong Tao,
Liu Xiaohui,
Guo Yong,
Wang Yanqin
Publication year - 2019
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.201900335
Subject(s) - catalysis , reductive amination , chemistry , ruthenium , amination , yield (engineering) , cyclopentanone , ketone , heterogeneous catalysis , adsorption , dispersion (optics) , organic chemistry , materials science , physics , optics , metallurgy
Abstract Amines are important compounds in natural products and medicines. Specifically, cyclopentylamine is one of the value‐added chemicals widely used in the production of pesticides, cosmetics and medicines. In this work, three Ru/Nb 2 O 5 catalysts with different Nb 2 O 5 morphologies were used in the reductive amination of cyclopentanone under mild reaction conditions (90 °C, 2 MPa H 2 ), among which 1 %Ru/Nb 2 O 5 −L catalyst exhibits best performance with the yield of cyclopentylamine reaching 84 %. This catalytic system is stable and has not significant deactivation even after 5 runs in the durability test. In addition, this catalyst can be extended to a series of aldehydes/ketones. Further comprehensive characterizations (XPS analysis and CO‐adsorption DRIFT) reveal that the electronic effect of Ru species can be ruled out; instead, the activity of the catalyst is strongly influenced by the geometric effect. Layered Nb 2 O 5 material possesses the highest surface area, resulting in the highest Ru dispersion, and therefore shows the highest catalytic activity. The in‐situ DRIFT‐MS technique was also used to reveal and understand the reaction mechanism. It is found that Ru species play a key role in activating carbonyl groups. This study illustrates a promising application of Ru/Nb 2 O 5 ‐Layer catalyst in the synthesis of amine and provides an understanding to the reaction mechanism.