Hydroxyl Groups Promoted Ag Dispersion and Excellent Performance of Ag/Al2O3 Catalyst for HCHO Oxidation

Hydroxyl groups are considered as anchoring sites for active components on catalysts. Guided by this viewpoint, 4 wt. % Ag/Al2O3 catalyst derived from Boehmite (AlOOH) was prepared and showed 100% formaldehyde conversion to CO2 at 75 degrees C. The results of H-1 MAS NMR, UV-vis spectra and Transmission electron microscopy (TEM) images suggest that the abundant bridging OH groups are prominently contributed to Ag anchoring and the formation of large content of small sized metallic Ag with high dispersion and Ag-n(delta+) cluster, and thus facilitating the catalytic oxidation of formaldehyde. This work will pave an attractive way for Ag/Al2O3 catalysts design and application. Graphic abstract The enrichment of bridging OH groups of AlOOH contributes to high dispersion of Ag particles and the formation of large content of small sized metallic Ag and Ag-n(delta+) cluster, thus facilitating the HCHO catalytic oxidation. [GRAPHICS] .

Automated summary

The enrichment of bridging hydroxyl groups contributes to the high dispersion of silver particles and the formation of a large content of small-sized metallic silver and Ag-n(δ+) clusters, thus facilitating the catalytic oxidation of formaldehyde.