Chemical Engineering Journal, 156(2), 236–242.ĭe Aguiar Pedott, V., Bordin, I., dos Santos da Silva, A., Petkowicz, D. Present and future synthesis challenges for zeolites. Also, the new materials can provide greater viability in processes, ensuring a longer service life of catalysts.Ĭoronas, J. This methodology allows the preparation of new highly active and selective enzyme catalysts using niobium and Cl. The supports were able to catalyze the esterification reaction at 40, 60, and 80 ☌, showing industrial application in reactions that require high temperatures.

For both materials, enzymatic activity remained stable for 5 months of storage at room temperature and refrigeration. The number of recycles obtained for the CALB enzyme immobilized in Nb-MCM-41 and Nb-MCM-48 was 26 recycles with a residual activity of 49.62% and 16 recycles with a residual activity of 53.01%, respectively. Also, both materials showed a pore size of 2.261 nm. The material presented a surface area of 954 and 704 m 2/g and a pore volume of 0.321 and 0.286 cm 3/g, for Nb-MCM-41 and Nb-MCM-48, respectively. SEM micrographs showed the formation of very regular spherical agglomerates with a diameter between 0.25 and 0.75 μm. The best Si/Nb molar ratio was chosen (Si/Nb = 20) and the CALB enzyme was immobilized in situ in the synthesized Nb-MCM.

MCM-41 and MCM-48 with niobium were successfully synthesized using 1-tetradecyl-3-methylimidazolium chloride (Cl) as a structure-directing agent.

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