Zeolite supported palladium catalysts for hydroalkylation of phenolic model compounds

0476368 - ÚFCH JH 2018 RIV NL eng J - Journal Article
Akhmetzyanova, U. - Opanasenko, Maksym - Horáček, J. - Montanari, E. - Čejka, Jiří - Kikhtyanin, O.
Zeolite supported palladium catalysts for hydroalkylation of phenolic model compounds.
Microporous and Mesoporous Materials. Roč. 252, NOV 2017 (2017), s. 116-124. ISSN 1387-1811. E-ISSN 1873-3093
R&D Projects: GA ČR GBP106/12/G015
Institutional support: RVO:61388955
Keywords : Phenol hydroalkylation * Cyclohexylcyclohexane * MWW
OECD category: Physical chemistry
Impact factor: 3.649, year: 2017

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.
Permanent Link: http://hdl.handle.net/11104/0272880