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

One-step fabrication of electrospun flexible and hierarchically porous Pt/γ-Al2O3 nanofiber membranes for HCHO and particulate removal

“…The main peak located at 530.07–530.12 eV accords with the lattice oxygen of γ-Al 2 O 3 , and the shoulder peak at 530.93–531.16 eV can be attributed to the surface hydroxyl groups and adsorbed oxygen species (such as O − , O 2 − , and O 2 2− ). 55 Compared with pure γ-Al 2 O 3 fibers (530.00 eV of binding energy for the characteristic peak of lattice oxygen in pure γ-Al 2 O 3 also by electrospinning in our previous work 54 ), the characteristic peaks of lattice oxygen in γ-Al 2 O 3 of the PAO samples present a positive shift, suggesting the existence of interaction between Pt and γ-Al 2 O 3 . 54 Fig.…”

“…). 55 Compared with pure g-Al 2 O 3 fibers (530.00 eV of binding energy for the characteristic peak of lattice oxygen in pure g-Al 2 O 3 also by electrospinning in our previous work 54 ), the characteristic peaks of lattice oxygen in g-Al 2 O 3 of the PAO samples present a positive shift, suggesting the existence of interaction between Pt and g-Al 2 O 3 . 54 Fig.…”

“…All the samples presented type IV sorption isotherm. 29,55 The H2-type hysteresis loops for AO and PAO1 suggest the presence of ink bottle-like pores, which were generated by the accumulation of nanoparticles. The superimposed loops of H2 and H3 types for PAO2 and PAO4 indicate the coexistence of both ink bottle-like and slit-like pore structures.…”

Visible-Light-Driven Photocatalytic H2 Production from H2O Boosted by Hydroxyl Groups on Alumina

“…21-1307). Presence of OH groups on the γ-Al 2 O 3 surface, with the O atoms of OH groups bonding to the Al atoms, converts part of γ-Al 2 O 3 into γ-AlOOH. − Thus, the XRD pattern reveals that there could be some OH groups on AO. On the XRD pattern of AOH, the small peaks at 45.8 and 67.0° are characteristic of the (400) and (440) planes of γ-Al 2 O 3 (JCPDS No.…”

Promoted Activity of Surface Hydroxyls on γ-Al2O3 Mineral Dust with the Coexistence of SO2 and NH3

“…These features create very favorable conditions for heterogeneous transformation of multipollutants into secondary particles on temporal and spatial scales. Although many studies involving heterogeneous reactions on mineral dust have been performed, − few studies have paid attention to the coupling relationships of SO 2 and NH 3 on mineral dust except for those of He et al − Interestingly, they found that, compared to the individual reaction of SO 2 or NH 3 on γ-Al 2 O 3 , the reactions of coexisting SO 2 and NH 3 contribute to the increased level of formation of SO 3 2– /HSO 3 – , SO 4 2– , and NH 4 + , − in which surface hydroxyls, defects, and surface reactive oxygen species on mineral dust are expected to be the active sites for SO 2 and NH 3 uptake. ,− However, a detailed mechanism and a quantitative description of thermodynamic and dynamic properties are difficult to determine straightforwardly by laboratory experiments, although they are the essential issues for understanding the synergistic phenomenon. In contrast, theoretical calculations are a powerful tool for illustrating the heterogeneous pathways and activation barriers at the molecular level. ,,− …”