Furfural aqueous phase hydrogenation by nickel: how activity and stability are affected by the catalyst architecture
Palavras-chave:
encapsulation, core-shell, bioeconomy, biomass upgrading, furfuryl alcoholResumo
Ni-SiO2 catalysts with encapsulated (NPNi@SiO2) and supported (Ni/SiO2) architectures were synthesized, characterized and evaluated in furfural hydrogenation rection. MET images indicated that NPNi present geometrical morphology and confirmed encapsulation. The diffractograms revealed that NPNi@SiO2 Ni crystal domains are bigger. The shell porosity was confirmed by N2 physissorption and the thermograms showed that Ni oxidation temperature is increased after encapsulation. TPR and XRD attested that NPNi@SiO2 presents Ni0 after synthesis, and do not demand reduction. Therefore, in the catalytic tests, Ni/SiO2 showed activity dependent on previous reduction in H2, while NPNi@SiO2 presented the same performance with and without that. Ni/SiO2 (red.) higher conversion in comparison to NPNi showed an impact of the different crystal domain sizes in activity. Moreover, NPNi higher conversion in relation to NPNi@SiO2 indicated that, the shell decreases Ni accessibility.
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