La(OH)3 and La2O2CO3 nanorod catalysts for Claisen-Schmidt condensation

doi:10.1016/S1872-2067(14)60008-5

Abstract

Abstract:

La(OH)₃ nanorods of 15 nm diameter and up to 700 nm long were synthesized using different pH values of the solution used in the hydrothermal synthesis. A more alkaline solution favored the formation of tiny La(OH)₃nuclei, which grew along the c-axis due to their anisotropic nature and led to the formation of rod-shaped crystals. Calcination of the La(OH)₃ nanorods at 773 K gave La₂O₂CO₃ nanorods. Their basic properties were correlated with their size. As the aspect ratio increased from 2 to 20, the basic sites increased from 0.08 to 0.24 mmol/g, which was due to a higher exposure of (110) planes. In the catalysis of the condensation reaction of benzaldehyde with acetophenone, the reaction rate was correlated with the number of La³⁺-O²^- pairs on the exposed (110) facets of the La₂O₂CO₃ nanorods.

Key words: La(OH)₃, La₂O₂CO₃, Nanorod, Crystal facet, Basicity, Claisen-Schmidt condensation

Fei Wang, Na Ta, Yong Li, Wenjie Shen . La(OH)₃ and La₂O₂CO₃ nanorod catalysts for Claisen-Schmidt condensation[J]. Chinese Journal of Catalysis, 2014, 35(3): 437-443.

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La(OH)₃ and La₂O₂CO₃ nanorod catalysts for Claisen-Schmidt condensation

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