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, DOI https://doi.org/10.1016/j.micromeso.2017.07.055.
Full text not available from this repository.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 |
|---|---|
| Funders: | University of Malaya Research Grant (GC001A-14AET), Research University Grant (RU004-2017), King Saud University, Deanship of Scientific Research, Research Chair |
| 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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