Articles written in Journal of Chemical Sciences
Volume 128 Issue 1 January 2016 pp 93-99 Regular Articles
[3+2] cycloaddition reaction of various types of nitriles and sodium azide (NaN3) were studied in the presence of nano-sized Cu-MCM-41 as an efficient recoverable heterogeneous catalyst. Nano-sized Cu-MCM-41 mesoporous molecular sieves with various Si/Cu molar ratios were synthesized by direct insertion of metal ions at room temperature. The textural properties of the materials have been studied by means of XRD, FTIR, SEM and TEM techniques. Catalytic behavior of Cu-MCM-41 was also investigated by pyridine absorption and potentiometric titration. The reactions data verified characterization results and show that Cu-MCM-41 with Si/Cu molar ratio of 20 has considerably better catalytic activity compared to the other molar ratios. To investigate reusability, the catalyst was recovered by simple filtration and reused for several cycles with consistent activity.
Volume 134 All articles Published: 13 July 2022 Article ID 0077 Regular Article
MCM-41 supported Cu and Fe with magnetic core (Fe3O4@Fe-Cu/MCM-41) was prepared and applied as a nanostructured catalyst in the Buchwald-Hartwig C-N cross-coupling reaction. The textural properties of the core-shell catalyst have been studied by means of XRD, FTIR, SEM, EDX, BET, and VSM techniques. The catalyst samples with various Si:Cu:Fe molar ratios were used in the C-N coupling, and the reaction data shows that Fe3O4@Fe-Cu/MCM-41 with Si:Cu:Fe molar ratio of 60:1.5:1 has a better catalytic performance. The prepared catalyst can be recovered and reused several times without any significant decrease in activity and magnetic properties.
Volume 134, 2022
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