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Issue 9, 2014
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Solvent-tuned hydrophobicity for faujasite-catalyzed cycloaddition of biomass-derived dimethylfuran for renewable p-xylene

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Abstract

Phase equilibria of the high temperature/high pressure heterogeneous catalytic reaction of 2,5-dimethylfuran (DMF), a biomass-derived furan, with ethylene to produce p-xylene was studied as a function of DMF conversion in a constant-pressure reactor. Adsorption of reactants and products onto a zeolite catalyst was computed using a configurational-bias Grand Canonical Monte Carlo (CB-GCMC) simulation, and the vapor–liquid behavior was computed using ASPEN Plus with an appropriate equation of state. It was found that the amount of water adsorbed in H–Y (Si/Al = 2.6) increases significantly as DMF is consumed, but is small in the presence of an aliphatic solvent, here n-heptane, even at high DMF conversion. The presence of the solvent reduces side reactions with water, such as hydrolysis followed by oxyalkylation, and increases p-xylene selectivity, in agreement with experiment. The decrease in the amount of water adsorbed is due to the increased hydrophobic environment in the zeolite as a result of the addition of n-heptane. The increase of ethylene inside the cage by the addition of n-heptane results in a slight increase of p-xylene alkylation. This work presents the first use of molecular simulation to understand mechanistic effects of solvents on the catalytic production of p-xylene in an H–Y zeolite.

Graphical abstract: Solvent-tuned hydrophobicity for faujasite-catalyzed cycloaddition of biomass-derived dimethylfuran for renewable p-xylene

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Publication details

The article was received on 22 Apr 2014, accepted on 10 Jul 2014 and first published on 11 Jul 2014


Article type: Communication
DOI: 10.1039/C4GC00727A
Citation: Green Chem., 2014,16, 4086-4091
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    Solvent-tuned hydrophobicity for faujasite-catalyzed cycloaddition of biomass-derived dimethylfuran for renewable p-xylene

    R. Xiong, S. I. Sandler, D. G. Vlachos and P. J. Dauenhauer, Green Chem., 2014, 16, 4086
    DOI: 10.1039/C4GC00727A

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