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Amination of Cyclohexanol over a Ni‐Based Catalyst – Part II: Catalyst Stability and Reaction Pathway
Author(s) -
Churro Rui,
Mendes Fernando,
Araújo Paulo,
Ribeiro Maria Filipa,
Madeira Luís M.
Publication year - 2021
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.202000120
Subject(s) - catalysis , cyclohexanol , chemistry , cyclohexylamine , selectivity , amination , reductive amination , molar ratio , organic chemistry
Ni‐based catalysts present a highly interesting performance for the reductive amination of cyclohexanol (CHOL). The stability of a commercial Ni‐based catalyst was evaluated and a high stability over the tested time‐on‐stream (TOS) was observed. The reaction network was evaluated by analysis of selectivity profiles as a function of CHOL conversion. The formation of cyclohexylamine (CHA) was found to be consistent with the proposed borrowing hydrogen method (BHM). The formation of heavy‐end (HE) by‐products also follows the BHM pathway as parallel reaction. The effect of individual molar proportions of NH 3 and H 2 was evaluated. It was found that when H 2 is present in a high excess, side reactions were favored, but its presence is mandatory towards keeping the catalyst active.