화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.68, 325-334, December, 2018
DOI10.1016/j.jiec.2018.08.003  Export Citation
Ru?NiOx nanohybrids on TiO2 support prepared by impregnation-reduction method for efficient hydrogenation of lactose to lactitol
Dinesh Kumar Mishra, Aasif A. Dabbawala1, Cong Chien Truong2, Saeed M. Alhassan1, Jonggeon Jegal, and Jin Soo Hwang†
  • Center for Bio-based Chemistry, Korea Research Institute of Chemical Technology (KRICT), Ulsan 44429, Republic of Korea
  • 1Material and Catalysis Division, Chemical Engineering Department, Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates
  • 2Korea Institute of Industrial Technology (KITECH) Campus, University of Science and Technology (UST), 89, Yangdaegiro-gil, Ipjang-myeon, Cheonan 31056, Republic of Korea
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Lactose is a reducing disaccharide consisting of two different monosaccharides such as galactose and glucose. The hydrogenation of lactose to lactitol is a formidable challenge because it is a complex process and several side products are formed. In this work, we synthesized Ru?Ni bimetallic nanohybrids as efficient catalysts for selective lactose hydrogenation to give selective lactitol. Ru-Ni bimetallic nanohybrids with Ru-NiOx (x = 1, 5, and 10 wt%) are prepared by impregnating Ru and Ni salts precursors with TiO2 used as support material. Ru-Ni bimetallic nanohybrids (represented as 5Ru-5NiO/TiO2) catalyst is found to exhibit the remarkably high selectivity of lactitol (99.4%) and turnover frequency i.e. (374 h-1). In contrast, monometallic Ru/TiO2 catalyst shows poor performance with (TOF = 251 h-1). The detailed characterizations confirmed a strong interaction between Ru and NiO species, demonstrating a synergistic effect on the improvement on lactitol selectivity. The impregnation-reduction method for the preparation of bimetallic Ru-NiO/TiO2 catalyst promoted Ru nanoparticles dispersed on NiO and intensified the interaction between Ru and NiO species. Ru-NiO/TiO2 efficiently catalyzed the hydrogenation of lactose to lactitol with high yield/selectivity at almost complete conversion of lactose at 120 °C and 55 bar of hydrogen (H2) pressure. Moreover, Ru-NiO/TiO2 catalyst could also be easily recovered and reused up to four runs without notable change in original activity.
Keywords:Lactose;Lactitol;Hydrogenation;NiO/TiO2;Ruthenium nanoparticles
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