Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 324, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2021.111270
Keywords
Aluminosilicate; APTMS; Functionalization; Nanosized
Categories
Funding
- FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo) [2018/21136-1]
- CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior -Brasil) [001]
- Nanotechnology National Laboratory for Agriculture (LNNA/Embrapa Instrumentation/FAPESP) [2018/01258-5]
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This study investigated the effect of crystallization time of aluminosilicate precursors of LTA zeolite on the propylamine anchoring capacity. It was found that solids prepared with shorter times in hydrothermal synthesis were more active in the Knoevenagel condensation reaction, demonstrating greater propylamine anchoring capacity. Additionally, amorphous precursors of LTA zeolite were found to be more active due to their greater accessibility of catalytic sites.
Knoevenagel condensation is a C-C bond formation reaction widely used in fine chemistry, which can be catalyzed by bases, such as Na-zeolites and supported amines. Due to the high size of the molecules that are used, its application is highly influenced by the accessibility of the catalytic sites that promote the reaction. In this context, this work studied the effect of the crystallization time of aluminosilicate precursors of LTA zeolite on the propylamine anchoring capacity. The materials were compared in terms of the amount of grafted propylamine as well as the accessibility of the sites in the Knoevenagel condensation reaction. Functionalized solids prepared with shorter times in hydrothermal synthesis were more active in the reaction due to the greater propylamine anchoring capacity. Also, the amorphous precursors of LTA zeolite were more active, due to their greater accessibility of the catalytic sites before the microporous structure was formed.
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