Selective dehydroisomerization of cyclic monoterpenes to p-cymene over silica-supported CdO

Alsharif, Aliyah ORCID: 0000-0001-9481-3077, Kozhevnikova, Elena F and Kozhevnikov, Ivan V ORCID: 0000-0003-2453-5256 (2023) Selective dehydroisomerization of cyclic monoterpenes to p-cymene over silica-supported CdO. Applied Catalysis B: Environmental, 325. p. 122362.

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Abstract

Cadmium oxide supported on silica is a highly active and selective bifunctional catalyst for the clean synthesis of p-cymene using dehydroisomerization of cyclic monoterpenes such as α-pinene, β-pinene, limonene, α-terpinene, γ-terpinene, and terpinolene. The dehydroisomerization occurs via acid-redox bifunctional catalysis at the gas-solid interface involving isomerization of monoterpenes to p-menthadienes on acid sites of silica support followed by p-menthadiene dehydrogenation to p-cymene on oxo-metal sites of CdO. The less reactive bicyclic monoterpenes, such as α-pinene and β-pinene, give 91–95% p-cymene yields at 325–375 °C, whereas more reactive monocyclic monoterpenes, such as limonene, α-terpinene, γ-terpinene, and terpinolene, give a 100% yield at 200–250 °C. To the best of our knowledge, CdO/SiO2 has the highest efficiency in monoterpene-to-p-cymene dehydroisomerization among the catalysts reported so far. The catalyst was characterized by BET, TGA, XRD, DRIFTS, H2-TPR, and ICP–OES.

Item Type:	Article
Uncontrolled Keywords:	Monoterpene, Dehydroisomerization, p-Cymene, Cadmium oxide
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	16 Jan 2023 10:21
Last Modified:	03 Jan 2024 02:30
DOI:	10.1016/j.apcatb.2023.122362
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3167040