Catalytic hydroconversion of two lignin-related model compounds over Ni/CeO2. (1st January 2023)

• Record Type: Journal Article
• Authors: Zhao, Ji; Wei, Xian-Yong; Lv, Jing-Hui; Kong, Qian-Qian; Li, Jia-Hao; Li, Zhuang; Fan, Zi-Chun; Li, Li; Zhang, Yang-Yang; Zong, Zhi-Min
• Is Part Of: Fuel. Volume 331:Part 2(2023)
• Publication Date: 2023-01-01
• Subjects: Ni/CeO2 -- Lignin-related model compounds -- Benzene ring hydrogenation -- >CH-O- bond cleavage; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.125808
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphic abstract: Highlights: Ni/CeO2 was prepared by in situ carbon templating and reduction with hydrogen. Ni/CeO2 shows a medium-strong acidity by temperature-programmed desorption of NH3 . The main active hydrogen species over Ni/CeO2 with H2 are H … H and H + . Ni/CeO2 effectively catalyzed the -CO bond cleavage and BR hydrogenation under MCs. Abstract: Ni/CeO2 with medium-strong acidity was prepared by in - situ carbon templating (ISCT) and reduction with H2 . Oxydibenzene (ODB) and benzyloxybenzene (BOB) were used as lignin-related model compounds (LRMCs). Over Ni/CeO2, ODB was completely converted into cyclohexane ( CH I ) under initial hydrogen pressure (IHP) of 2 MPa at 160 °C for 2 h and complete conversion of BOB to CH I and methylcyclohexane (MCH) was achieved under IHP of 2 MPa at 120 °C for 1.5 h. H … H transfer to the benzene rings (BRs) in the LRMCs and phenol from BOB hydrocracking results in the BR hydrogenation, while H + transfer to the oxygen atom in BOB, hydrogenated ODB, and BOB-derived cyclohexanol ( CH II ) leads to the >CH-O- bond cleavage and subsequent dehydration of the resulting protonated CH II (PCH II ) . In addition, Ni/CeO2 exhibits an excellent reusability.