The physicochemical and catalytic properties of clay extrudates in cyclization of citronellal
Vajglová, Zuzana; Simakova, Irina L.; Eränen, Kari; Mäki-Arvela, Päivi; Kumar, Narendra; Peurla, Markus; Tolvanen, Stiina; Efimov, Alexander; Hupa, Leena; Peltonen, Jouko; Murzin, Dmitry Yu (2022)
Vajglová, Zuzana
Simakova, Irina L.
Eränen, Kari
Mäki-Arvela, Päivi
Kumar, Narendra
Peurla, Markus
Tolvanen, Stiina
Efimov, Alexander
Hupa, Leena
Peltonen, Jouko
Murzin, Dmitry Yu
2022
118426
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202112028856
https://urn.fi/URN:NBN:fi:tuni-202112028856
Kuvaus
Peer reviewed
Tiivistelmä
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 °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 Brønsted-to-Lewis acid sites ratio, and the lowest amount of Brønsted acid sites compared to other extrudates. In addition, same clay exhibited the highest mechanical strength of extrudates.
Kokoelmat
- TUNICRIS-julkaisut [16951]