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The physicochemical and catalytic properties of clay extrudates in cyclization of citronellal
- Source :
- Applied Catalysis A: General. 629:118426
- Publication Year :
- 2022
- Publisher :
- Elsevier BV, 2022.
-
Abstract
- 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. publishedVersion
Details
- ISSN :
- 0926860X
- Volume :
- 629
- Database :
- OpenAIRE
- Journal :
- Applied Catalysis A: General
- Accession number :
- edsair.doi.dedup.....1a33e0ab4376659bb9b949d81d1d139a