화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.95, 190-202, March, 2021
DOI10.1016/j.jiec.2020.12.019  Export Citation
Commercial catalysts screening for the direct amination of cyclohexanol
Rui Churro1, 2, Fernando Mendes2, Paulo Araújo2, Luís M. Madeira1, and Filipa Ribeiro3, †
  • 1LEPABE, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
  • 2Bondalti Chemicals, SA, Quinta da Indústria, Rua do Amoníaco Portugues, no 10, Beduído, 3860-680 Estarreja, Portugal
  • 3Centro de Química Estrutural, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
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Two groups of commercially available Ni- and Pd-based catalysts were used for the direct amination of cyclohexanol (CHOL) with NH3 as aminating agent and in the presence of H2, aiming the selective production of cyclohexylamine (CHA) and aniline. The fresh catalysts were characterized in terms of metal loading, support composition (prevailing SiO2 and Al2O3) and metallic dispersion. Ni-based catalysts revealed to be highly active while Pd-based were more selective towards aniline, however requiring higher temperatures and catalyst loading to reach significant CHOL conversions (from 17 up to 67 %). The activity of the catalysts is intrinsically related to their metallic dispersion regardless the metal loading. The Ni-based catalyst with 46 wt. % of Ni is the most promising once it presents higher turnover frequency (TOF) values, as 10 fold high, particularly related to the ratio of desired to undesired by- products. Moreover, operating conditions considerably affect catalysts’ performance.
Keywords:Heterogeneous catalysis;Ni-based catalysts;Pd-based catalysts;Cyclohexanol;Cyclohexylamine;Aniline
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