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    The physicochemical and catalytic properties of clay extrudates in cyclization of citronellal

    Year: 2022

    Journal: Appl. Catal. A-Gen., Volume 629, JAN 5

    Authors: Vajglova, Zuzana; Simakova, Irina L.; Eranen, Kari; Maki-Arvela, Paivi; Kumar, Narendra; Peurla, Markus; Tolvanen, Stiina; Efimov, Alexander; Hupa, Leena; Peltonen, Jouko; Murzin, Dmitry Yu

    Organizations: Academy of Finland; Biocenter Finland; Ministry of Science and Higher Education of the Russian Federation [AAAAA21-121011390055-8]

    Keywords: Clay; Extrudates; Citronellal cyclization; Bentonite; Attapulgite; Sepiolite; Palygorskite

    Four clay materials, namely, bentonite, bleaching earth, attapulgite and sepiolite, were shaped into the cylindrical body by extrusion. Clays were characterized in depth by TEM, SEM-EDX, N2 physisorption, pyridine FTIR, pH measurements, contact angle measurements, 27Al MAS NMR, and the crush test. Catalytic properties were investigated in the citronellal cyclization as a model reaction. The reaction was performed in the trickle-bed reactor at 70 degrees C, 10 bar of Ar with 0.086 M initial citronellal concentration in cyclohexane. The best results were obtained over attapulgite with isopulegols yield of 24% and stereoselectivity to the desired isopulegol isomer of 61%. Attapulgite had the highest meso-to-micropore volume ratio, the highest basicity, a low Bronstedto-Lewis acid sites ratio, and the lowest amount of Bronsted acid sites compared to other extrudates. In addition, same clay exhibited the highest mechanical strength of extrudates.
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