The influence of precipitation temperature on the properties of ceria–zirconia solid solution composites

Effect of the calcination temperature of cerium–zirconium mixed oxides on the structure and catalytic performance of WO3/CeZrO2 monolithic catalyst for selective catalytic reduction of NOx with NH3

“…The prominent peak at about 465 cm À1 corresponded to the F 2g vibration mode of cubic CeO 2 , which could be considered as the symmetric breathing vibrational mode of the O anions around Ce cations. 19,22 However, a shi in the Raman frequency to higher wavenumber from 463 cm À1 at 400 C to 472 cm À1 at 700 C was observed, which resulted from the incorporation of more Zr into the lattice of the cerium zirconium solid solution, as evidenced by XRD results. It was surprise that a less prominent band at around 477 cm À1 was visible in the Raman spectra of catalysts; the intensity of this band gradually decreased with increasing the calcination temperature, and nally the band vanished in the spectrum of W/CZ-700.…”

“…5). According to the literature, 19,21 the radius of Zr 4+ (0.84Å) is smaller than that of Ce 4+ (0.97Å), and the incorporation of zirconia into the ceria lattice led to the shrinkage of the crystal cells, which induced a shi of 2q value to higher values. Consequently, the incorporation of more zirconia into the ceria lattice resulted in an increase in the 2q value aer higher temperature calcination.…”

“…For all catalysts, the isotherms corresponded to type IV with H2 hysteresis loop, with a relatively wide ink-bottle shaped pore according to the IUPAC classication, indicating the presence of a mesoporous texture. [18][19][20] With increasing calcination temperature, the N 2 adsorbed volume per weight showed an obvious decrease and the closure point of the hysteresis loop also moved to higher P/ P 0 , revealing that much more large mesopores were formed aer high temperature calcination of the carrier. The pore radius of the serial catalysts increased as described by Kelvin equation in the following order: W/CZ-700 > W/CZ-600 > W/CZ-500 > W/CZ-400, while the surface area and cumulative pore volume of catalysts exhibited an inverse order as shown in Table 2.…”

Influence of composition on structure, morphology and dielectric properties of BixAlyOz composite films synthesized by atomic layer deposition

“…Currently, along with the great demand for multicomponent materials, several techniques are being used in fabricating composite materials like solid solution precipitation and high-temperature sintering. 20,21 Even so, these processes still have room for improvement in the respect of sufficient and even dissolution in the solid phase of various components. In this work, we introduced the atomic layer deposition (ALD) technique in the deposition of Bi x Al y O z films with a various number of bismuth cycles (expressed by m=5, 10,20) and one aluminum cycle (expressed by n=1) in a super cycle.…”

“…20,21 Even so, these processes still have room for improvement in the respect of sufficient and even dissolution in the solid phase of various components. In this work, we introduced the atomic layer deposition (ALD) technique in the deposition of Bi x Al y O z films with a various number of bismuth cycles (expressed by m=5, 10,20) and one aluminum cycle (expressed by n=1) in a super cycle. Bismuth was incorporated by forming solid solution films with Bi 2 O 3 and Al 2 O 3 (the experimental details can be seen in the supplementary material).…”