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Experimental Study on Microwave–SiC-Assisted Catalytic Hydrogenation of Phenol
journal contribution
posted on 2019-11-13, 16:15 authored by Jing Sun, Zhenyu Jiang, Ke Wang, Faqi Li, Zhanlong Song, Wenlong Wang, Xiqiang Zhao, Yanpeng MaoCatalytic hydrogenation provides an important pathway
for converting
environmentally toxic phenol into less oxygenated and more stable
useful chemical feedstock for the production of nylon and multicomponent
diesel fuel. In this study, an innovative microwave–SiC-assisted
heating technology was adopted to induce the vapor-phase catalytic
hydrogenation of phenol over a Pd catalyst supported on Zr/Ce oxide.
The H2 flow rate, catalyst support, and reaction temperature
influenced the phenol conversion as well as product yield and selectivity.
At a modest reaction temperature of 200 °C, the hydrogenation
of phenol produced a mixture of cyclohexanol (COL) and cyclohexanone
(CONE), and the COL/CONE molar ratio was influenced by the catalyst
supports in the following order: Pd/CeO2 > Pd/ZrCeO2 > Pd/ZrO2. Under identical experimental conditions,
the microwave–SiC-assisted hydrogenation exhibited superior
performance over conventional hydrogenation in terms of both the phenol
conversion and product yield. Particularly, the product selectivity
of COL was remarkably enhanced for all catalyst types, primarily attributed
to the abundant H• radicals, which were induced
by electron collision as a result of microwave–SiC interaction,
facilitating the hydrogenation of CONE into COL. In general, our innovative
microwave–SiC-assisted hydrogenation presented a significant
advantage in converting phenol into less-oxygenated compounds, hence providing
an important reference for industrial practice.