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

Author(s)

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

• Document type: Journal article
• Source: Microporous and Mesoporous Materials; v. 378, p. 6-pg., 2024-07-17.

Abstract

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)

• FAPESP's process: 23/10544-0 - Simultaneous improvement of accessibility and hydrophobicity in zeolites: water-tolerant nanosized crystals
• Grantee: Leandro Pierroni Martins
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/21136-1 - Embryonic zeolites: a novel catalyst for cascade reactions
• Grantee: Iago William Zapelini
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 21/08326-9 - Effects of crystallinity and different amines on the acid-base catalytic properties of amine-grafted H-aluminosilicates
• Grantee: Iago William Zapelini
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate