Formation of the CaSnO3 crystalline phase during catalytic aldol condensation of acetone under supercritical conditions

The aldol condensation of acetone was carried out under the conditions of the supercritical state of the reagent (350 °C, 8 MPa; 400 °C, 12 MPa) on catalysts prepared by the thermal treatment of CaSn(OH) 6 at 450 and 750 °C. The X-ray amorphous phase of CaSnO 3 transforms into crystalline calcium st...

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Bibliographic Details
Published in:Russian chemical bulletin 2022-09, Vol.71 (9), p.1930-1939
Main Authors: Bogdan, T. V., Koklin, A. E., Mishin, I. V., Mashchenko, N. V., Smirnov, A. V., Savarets, A. R., Bogdan, V. I.
Format: Article
Language:English
Subjects:
Acetone
Aldehydes
Catalysts
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Conversion
Crystal structure
Crystallinity
Full Articles
Heat treatment
Inorganic Chemistry
Organic Chemistry
Reagents
Selectivity
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Summary:The aldol condensation of acetone was carried out under the conditions of the supercritical state of the reagent (350 °C, 8 MPa; 400 °C, 12 MPa) on catalysts prepared by the thermal treatment of CaSn(OH) 6 at 450 and 750 °C. The X-ray amorphous phase of CaSnO 3 transforms into crystalline calcium stannate as the thermal treatment temperature increases from 450 to 750 °C. At 350 °C and 8.0 MPa, the selectivity of the reaction to mesityl and isomesityl oxides is about 85% (for both samples), but the conversion of acetone is much higher on CaSnO 3 after it has been thermally treated at 750 °C. The reuse of the CaSnO 3 -450 catalyst led to its transformation. The conversion of acetone increases, and the reaction parameters (conversion and selectivity) reach values characteristic of CaSnO 3 -750. The catalyst structures were studied by XRD and scanning and high-resolution transmission electron microscopies.
ISSN:1066-5285
1573-9171
DOI:10.1007/s11172-022-3611-2