Transformation evolution and infrared absorption spectra of amorphous and crystalline nano-Al2O3 powders

Dendrimer-based preparation of mesoporous alumina nanofibers by electrospinning and their application in dye adsorption

“…As shown by Fig. 1 [35]. When the calcination temperature is set as 700 °C, a weak peak can be detected at 833 cm -1 , implying the formation of γ-Al 2 O 3 [36].…”

Highly efficient Cu–Zn–Al catalyst for the hydrogenation of dimethyl adipate to 1,6-hexanediol: influence of calcination temperature

“…4 clearly shows a broad peak at 3,424 cm -1 , which is attributed to characteristic stretching vibration of hydroxylate (O-H). A broad band ranging from 500 to 900 cm -1 can be attributed to the disordered distribution of vacancies and the continuous distribution of bond length in an amorphous material [24]. The results reveal that abundant surface hydroxyl groups exist in the catalyst.…”

Binary Oxides with Defined Hierarchy of Pores in the Esterification of Glycerol

“…The presence of these two bands indicates that the as-synthesized samples contain water of hydration [25]. These bands may also have arisen from the hydrated compounds possessing the boehmite phase, as for as-synthesized aluminum and silicon containing samples [26]. The peaks at around 2940, 1457 and 1379 cm −1 are related to the C-H symmetric stretching and scissoring (bending) vibrations.…”