4.6 Article

One-Pot Synthesis of Menthol Starting from Citral over Ni Supported on Attapulgite-H-Beta-38 Extrudates in a Continuous Flow: Effect of Metal Location

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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷 61, 期 35, 页码 12998-13010

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AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.2c02345

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  1. Academy of Finland
  2. Biocenter Finland
  3. Ministry of Science and Higher Education of the Russian Federation [AAAA-A21-121011390055-8]

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In this study, the one-pot synthesis of menthol from citral was investigated using different types of extrudates as catalysts. The catalyst consisting of Ni supported on H-Beta-38 and extruded with attapulgite showed the highest yield and excellent characteristics.
The one-pot synthesis of menthol from citral in a continuous mode was investigated over three different types of extrudates, namely Ni supported on H-Beta-38 and extruded with attapulgite, Ni supported on attapulgite and extruded with H-Beta 38, and the extrudates, which were shaped after deposition of Ni on both H-Beta-38 and attapulgite in the powder form. These composite catalysts were characterized by X-ray diffraction, transmission and scanning electron microscopy, temperature-programmed reduction of H-2, mechanical strength, and pyridine adsorption desorption. These three types of extrudates exhibited different metal particle sizes and acidity. The most promising catalyst in the one-pot menthol synthesis was Ni supported first on H-Beta-38 and then extruded with attapulgite giving a 45% yield of menthols in a trickle bed reactor. This catalyst exhibited 10 nm nickel particles and a rather high amount of strong Bronsted acid sites.

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