Highly efficient green mesostructured urea functionalized on SBA-15 catalysts for selective synthesis of benzlidenemalononitrile

Appaturi, Jimmy Nelson and Johan, Mohd Rafie and Ramalingam, R. Jothi and Al-Lohedan, Hamad A. (2018) Highly efficient green mesostructured urea functionalized on SBA-15 catalysts for selective synthesis of benzlidenemalononitrile. Microporous and Mesoporous Materials, 256. pp. 67-74. ISSN 1387-1811

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Official URL: https://doi.org/10.1016/j.micromeso.2017.07.055

Abstract

A series of urea-immobilized SBA-15 catalysts were synthesized via post grafting method using 3-chloropropyltriethoxysilane (CPTES) as the anchoring agent. The solid catalyst was characterized by PXRD, N2 adsorption-desorption, FT-IR, elemental analyzer, TEM, CO2-TPD and 29Si CP/MAS NMR. Detailed analysis of the pore size illustrated the mesoporous nature of the immobilized catalyst. The as-prepared catalyst was further evaluated in the Knoevenagel condensation reaction under different reaction conditions. Benzaldehyde was employed in the Knoevenagel condensation reaction with malononitrile. Catalytic results showed that the Urea(4.8)/SBA-15 exhibits high efficacy (98% of yield) for promoting this reaction at 40 °C and in the absence of a solvent. Under the same reaction conditions, acetylacetone led to a lower benzaldehyde conversion of 10%, whereas ethyl cyanoacetate provides up to 88% conversion. The catalyst could be recycled and reused for at least five reaction cycles with slight loss of catalytic activity.

Item Type: Article
Uncontrolled Keywords: SBA-15; Urea; Immobilization; Knoevenagel condensation
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Divisions: Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 20 Sep 2019 02:08
Last Modified: 20 Sep 2019 02:08
URI: http://eprints.um.edu.my/id/eprint/22460

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