Inorganic‐organic hybrid material based on amine‐functionalized zeolite Y: A study of catalytic activity in transesterification

Abstract

Three different structures of amine compound, 3‐aminopropyl trimethoxysilane (N1), N‐[3‐(trimethoxysilyl)propyl] ethylenediamine (N2), and N‐[3‐(trimethoxysilyl)propyl] diethylenetriamine (N3), functionalized on zeolite Y, were used to enhance catalyst lifetime in the transesterification reaction. The presence of amine compound was confirmed by FTIR. Moreover, the grafting percentage of amine on zeolite Y was also considered, since it affected the basicity and basic strength of the catalyst. The catalytic activity testing for transesterification of glyceryl tributyrate (GTB) and methanol was carried out in an autoclave reactor at reaction conditions of 30:1 molar ratio of methanol to GTB and a catalyst loading level of 0.35 g/g (35 mass% of GTB). The highest methyl butyrate production per active site was obtained by N3, due to its having the highest basic strength. The highest methyl butyrate yield was given by N1, due to its having the highest amino group concentration (basicity). Therefore, the catalytic activity, in terms of methyl butyrate yield and methyl butyrate production per active site, was affected by both basic strength and basicity. The reusability of the catalysts showed that the methyl butyrate yield slightly declined to ∼13.8 % yield after four cycles, but the methyl butyrate production per active site remained constant across four cycles.

Recent Advances in the Preparation and Applications of Organo‐functionalized Porous Materials

“…Samart et al . successfully functionalized zeolite‐Y with various amino silanes via a direct condensation method and probed the catalytic activity of the obtained materials for esterification of glyceryl tributyrate and methanol . Among the functionalized zeolites Y, N‐[3‐(trimethoxysilyl)propyl] diethylenetriamine functionalized zeolite Y, which has registered the highest basic strength, showed the highest activity with a large selectivity to methyl butyrate.…”

“…Along with periodic mesoporous silica, the development of chiral PMOs by utilizing chiral bridging organosilane ligands has received much attention as they have found numerous applications in catalysis and chromatography . In particular, organic‐ functionalized molecular sieves have been used in transesterifications, Knoevenagel reactions, epoxidation of cyclooctene, cyano‐ethoxy carbonylation, flavanone synthesis, and aldol condensation . They have also been employed as metal ion (Fe 2+ and Co 3+ ) scavengers and the support for the noble metals (e. g., Rh) .…”

Hydrothermal synthesis of zeolite Y from green materials

“…[16][17][18] They have three-dimensional structures with well-defined micropores or mesopores. [19][20][21] The porous structure of zeolite provides a substantial surface area which are compatible with the absorbing capacity of the zeolitic materials and ensure their efficiency in various applications as an adsorbent. [22][23][24] The zeolites consist of alkaline earths and exchangeable aluminosilicates.…”