首页|The physicochemical and catalytic properties of clay extrudates in cyclization of citronellal
The physicochemical and catalytic properties of clay extrudates in cyclization of citronellal
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NSTL
Elsevier
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.
NSTL
Elsevier
