Exploring surface silanols in mesoporous Na-LTA zeolite to enhance its catalytic activity in knoevenagel condensation by grafting amino groups

Autor(es)

da Silva, Juliana Floriano ; Zapelini, Iago William ; Ferracine, Edilene Deise da Silva ; Mintova, Svetlana ; Cardoso, Dilson

• Tipo de documento: Artigo Científico
• Fonte: Microporous and Mesoporous Materials; v. 378, p. 6-pg., 2024-07-17.

Resumo

Mesoporous Na-LTA zeolite was synthesized using the surfactant templating method with the organosilane surfactant [3-(trimethoxysilyl)propyl] octadecyldimethylammonium chloride (TPOAC). The formation of mesopores not only improved the accessibility of the basic catalytic sites but also led to the formation of isolated external silanols. These silanols were used to anchor propylamine groups by reacting with 3-aminopropyltrimethoxysilane (APTMS). The incorporation of propylamine groups in the mesoporous Na-LTA improved its catalytic activity in the Knoevenagel condensation reaction by 40 % due to the presence of extra basic catalytic sites from amino groups. The combination of mesopore generation and functionalization is an efficient strategy for enhancing the performance of Na-LTA zeolite in this reaction. (AU)

• Processo FAPESP: 23/10544-0 - Melhoria simultânea da acessibilidade e hidrofobicidade em zeólitas: cristais nanométricos tolerantes à água do meio reacional
• Beneficiário: Leandro Pierroni Martins
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/21136-1 - Embriões de zeólitas: um novo catalisador para reações em cascata
• Beneficiário: Iago William Zapelini
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 21/08326-9 - Efeitos da cristalinidade e de diferentes aminas na propriedade catalítica ácido-base de H-aluminossilicatos com aminas ancoradas
• Beneficiário: Iago William Zapelini
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado