“…[6][7][8][9] Due to the structural complexity of lignin, dimeric lignin model compounds representing C-O linkages NOMENCLATURE: BR, benzene ring; CEOB, (2-cyclohexylethoxy)benzene; CEOC, (2-cyclohexylethoxy)cyclohexane; CH, cyclohexane; CHC, catalytic hydroconversion; CHEB, (2-cyclohexylethyl)benzene; CHEL, 2-cyclohexylethanol; CHL, cyclohexanol; COEB, (2-(cyclohexyloxy)ethyl) benzene; DCHE, 1,2-dicyclohexylethane; EB, ethylbenzene; ECH, ethylcyclohexane; GC-MS, gas chromatography/mass spectrometry; IHP, initial H 2 pressure; PEL, 2-phenylethanol; 2-PEP, 2-phenethylphenol; 4-PEP, 4-phenethylphenol; POB, phenethoxybenzene; SSA, specific surface area; TPV, total pore volume in lignin have been studied to investigate the CHC mechanism at molecular level. 4,[18][19][20] Among various model compounds, phenethoxybenzene (POB), which represents β-O-4 linkage that is the dominant linkage in lignin, has been widely used as a lignin model compound for studying the CHC mechanism. 6,21-23 Zhao et al 6,22 found that the reaction route of POB over Ni/HZSM-5 or Pd/C and HZSM-5 proceeded through metal-catalyzed C-O bridged bond cleavage followed by sequential hydrogenation and dehydration reactions to remove oxygen atoms in aqueous phase.…”