Low content Pt-doped CeO2 and core-shell type CeO2/ZrO2 model catalysts; microstructure, TPR and three way catalytic activities

Atomistic origin of high-concentration Ce3+ in {100}-faceted Cr-substituted CeO2 nanocrystals

“…Alternatively, metal ions, such as Zr 4+ , Ti 4+ , Y 3+ , Cu 2+ , etc., can be introduced into CeO 2 by substitution in the Ce sites with the aim of altering the chemical and physical properties of the host [23][24][25][26][27][28][29][30]. Among all of these metal ions, the Zr dopant has attracted increasing attention mainly because it forms a solid oxide solution of Ce 1-x Zr x O 2 (x ≤ 0.5), and consequently improves the OSC and the practical application in the model system of three-way catalysis [31][32][33][34]. Additionally, the valence states of the dopants are known to play a vital role in altering the V O s formation energy, surface acid-base property and reactivity of CeO 2 , particularly for dopants with lower valence states than the host cation [35].…”

Liquid-Phase Hydrogenation of Benzaldehyde on Low-Percentage Pt-Containing Catalysts under Mild Conditions

“…This effect could be associated with additional reduction of the deposited active phase during TPR analysis, since all samples were preliminarily treated at the same temperature (250°C). However, it is known that an increase in the interaction between the metal phase and the support can be observed upon reducing the amount of deposited metal (and thus the size of particles or clusters), so a higher temperature could be needed for complete reduction than in case of larger particles [12]. It should also be noted that the reduction of cerium oxide in the carrier without supported metal started at temperatures above 250°C.…”

Study of spatial and temporal aging characteristic of catalyzed diesel particulate filter catalytic performance used for diesel vehicle

“…The XPS is an effective method to measure the composition and chemical state of surface elements of the materials by quantitatively evaluating the binding energy peak intensity and peak displacement of different atoms or molecule 33 . The catalytic activity evaluation based on temperature-programmed reduction (TPR) system is an effective method to quantitatively analyze the catalytic activity of the catalyst 34 . In this study, the XRD analysis was conducted to ascertain phase changes, crystallinity et al of the CDPF samples by X ray diffractometer (D8 Advance, Bruker Axs Gmbh, Germany), the test accuracy is very high with angular reproducibility of ± 0.001°, and the test stability is ± 0.01%.…”

“…The XPS is an effective method to measure the composition and chemical state of surface elements of the materials by quantitatively evaluating the binding energy peak intensity and peak displacement of different atoms or molecule 33 . The catalytic activity evaluation based on temperature-programmed reduction (TPR) system is an effective method to quantitatively analyze the catalytic activity of the catalyst 34 .…”