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4901773 
Journal Article 
Zeolite supported palladium catalysts for hydroalkylation of phenolic model compounds 
Akhmetzyanova, U; Opanasenko, M; Horacek, Jan; Montanari, E; Cejka, J; Kikhtyanin, O 
2017 
1 
Microporous and Mesoporous Materials
ISSN: 1387-1811 
252 
116-124 
WOS:000407658700012 
Bifunctional palladium-based catalysts with zeolite supports were investigated in phenol hydroalkylation, representing high-potential model reaction for transformation of lignocellulose-derived compounds to automotive and jet fuels. Conversion of phenol correlated with the amount of accessible acid sites and textural properties of the solid acid support: under the same reaction conditions and at the same Pd loading. The highest phenol conversions (99-100%) were obtained for large-pore zeolite Beta and mesopore-containing MCM-36/56 materials. The selectivity towards the targeted cyclohexylcyclohexane on different supports decreased in the following order Beta (57%) > MCM-36 (42%) approximate to MCM-56 (37%) > MCM-22 (20%), while the contribution of undesired reaction termination through formation of non-reactive cyclohexane was more pronounced for the expanded MCM-36/56 based catalysts. Substrate consumption after 60 min over the least active MCM-22-based catalysts increased with increasing Pd content as follows 27% (0.3 wt % Pd), 80% (0.5 wt % Pd) and 98% (0.7 wt % Pd). High activity of Pd/Beta catalysts was not vitiated even by sintering effects being the most pronounced for Beta as a support. (C) 2017 Elsevier Inc. All rights reserved. 
Phenol hydroalkylation; Cyclohexylcyclohexane; Pd; Zeolites; MWW; Beta