首页|Continuous synthesis of menthol from citronellal and citral over Ni-beta-zeolite-sepiolite composite catalyst

Continuous synthesis of menthol from citronellal and citral over Ni-beta-zeolite-sepiolite composite catalyst

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  • NSTL
  • Elsevier
One-pot continuous synthesis of menthols both from citronellal and citral was investigated over 5 wt% Ni supported on H-Beta-38-sepiolite composite catalyst at 60-70 degrees C under 10-29 bar hydrogen pressure. A rela-tively high menthols yield of 53% and 49% and stereoselectivity to menthol of 71-76% and 72-74% were obtained from citronellal and citral respectively at the contact time 4.2 min, 70 degrees C and 20 bar. Citral conversion noticeably decreased with time-on-stream under 10 and 15 bar of hydrogen pressure accompanied by accu-mulation of citronellal, the primary hydrogenation product of citral, practically not affecting selectivity to menthol. A substantial amount of defuctionalization products observed during citral conversion, especially at the beginning of the reaction (ca. 1 h), indicated that all intermediates could contribute to formation of menthanes. Ni/H-Beta-38-sepiolite composite material prepared by extrusion was characterized by TEM, SEM, XPS, XRD, ICP-OES, N-2 physisorption and FTIR techniques to perceive the interrelation between the physico-chemical and catalytic properties.

Menthol synthesisCitral hydrogenationNi/Beta catalystExtrudatesContinuous reactorONE-POT SYNTHESISHETEROGENEOUS CATALYSTPHYSICOCHEMICAL CHARACTERIZATIONBIFUNCTIONAL CATALYSTSHETEROPOLY ACIDTRANSFORMATIONSTEPCYCLIZATION(+/-)-CITRONELLALHYDROGENATION

Simakova, Irina、Maki-Arvela, Paivi、Martinez-Klimov, Mark、Muller, Joseph、Vajglova, Zuzana、Peurla, Markus、Eranen, Kari、Murzin, Dmitry Yu

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Boreskov Inst Catalysis

Abo Akad Univ

Univ Turku

2022

10.1016/j.apcata.2022.118586

Applied Catalysis

Applied Catalysis

ISSN：0926-860X
年,卷(期)：2022.636
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