Commercial catalysts screening for the direct amination of cyclohexanol

다국어 초록 (Multilingual Abstract)

Two groups of commercially available Ni- and Pd-based catalysts were used for the direct amination ofcyclohexanol (CHOL) with NH3 as aminating agent and in the presence of H2, aiming the selectiveproduction of cyclohexylamine (CHA) and aniline. The fresh catalysts were characterized in terms ofmetal loading, support composition (prevailing SiO2 and Al2O3) and metallic dispersion. Ni-basedcatalysts revealed to be highly active while Pd-based were more selective towards aniline, howeverrequiring higher temperatures and catalyst loading to reach significant CHOL conversions (from 17 up to67 %). The activity of the catalysts is intrinsically related to their metallic dispersion regardless the metalloading. The Ni-based catalyst with 46 wt. % of Ni is the most promising once it presents higher turnoverfrequency (TOF) values, as 10 fold high, particularly related to the ratio of desired to undesired by-products. Moreover, operating conditions considerably affect catalysts’ performance.

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