2019
DOI: 10.1016/j.jcat.2019.04.047
|View full text |Cite
|
Sign up to set email alerts
|

Phase transformation and oxygen vacancies in Pd/ZrO2 for complete methane oxidation under lean conditions

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1
1

Citation Types

1
50
1

Year Published

2021
2021
2024
2024

Publication Types

Select...
9

Relationship

0
9

Authors

Journals

citations
Cited by 87 publications
(52 citation statements)
references
References 84 publications
1
50
1
Order By: Relevance
“…41 The structure of the Pd−Zr alloy NPs was observed in the Pd−Zr/HZSM-5 catalysts by H 2 -TPR and XPS (Figure 6 and Figure 7f), resulting in a strong interaction between Pd and Zr, which can cause the phase transition of ZrO 2 to produce oxygen vacancy. 42 The results of H 2 -TPR (Figure 6) showed that the Pd−O−Zr solid solution is transformed into the PdO−ZrO 2 solid solution with the Pd/Zr mass ratio increasing from 1:2 to 1:4, and the temperature of the reduction peak also rises accordingly, which means that the interaction between palladium and zirconium is indeed increasing. As shown in Figure 7b, the oxygen vacancy concentration of the 0.5%Pd− 2.0%Zr/HZSM-5 catalyst reaches a maximum when the Pd/Zr mass ratio is 1:4.…”
Section: ■ Results and Discussionmentioning
confidence: 95%
“…41 The structure of the Pd−Zr alloy NPs was observed in the Pd−Zr/HZSM-5 catalysts by H 2 -TPR and XPS (Figure 6 and Figure 7f), resulting in a strong interaction between Pd and Zr, which can cause the phase transition of ZrO 2 to produce oxygen vacancy. 42 The results of H 2 -TPR (Figure 6) showed that the Pd−O−Zr solid solution is transformed into the PdO−ZrO 2 solid solution with the Pd/Zr mass ratio increasing from 1:2 to 1:4, and the temperature of the reduction peak also rises accordingly, which means that the interaction between palladium and zirconium is indeed increasing. As shown in Figure 7b, the oxygen vacancy concentration of the 0.5%Pd− 2.0%Zr/HZSM-5 catalyst reaches a maximum when the Pd/Zr mass ratio is 1:4.…”
Section: ■ Results and Discussionmentioning
confidence: 95%
“…However, the excessive doping of Zr 4+ may replace the host Ni 2+ cations, 39 causing the decrease in Ni 2+ and oxygen vacancies, which manifested that the rational regulation on the compositions was crucial for the design of high-performance catalysts. In view of oxygen vacancies facilitating the oxygen migration and exchange process, 51 Ni 0.89 Zr 0.11 O 2−δ with less lattice oxygen species and more oxygen vacancies could exhibit higher oxygen mobility and possess more active oxygen species, contributing to the superior catalytic performance. It should be noted that there was negligible variation in Ni 2+ and O II species over used Ni 0.89 Zr 0.11 O 2−δ as demonstrated by Raman and XPS analysis (Figure S6 and Table S4), which was conducive to the sustained and efficient oxidation of methane.…”
Section: Resultsmentioning
confidence: 99%
“…Among catalysts, Ni 0.89 Zr 0.11 O 2−δ with a larger number of surface reactive oxygen species exhibited a better catalytic activity (Figure S5B). It has been disclosed that the water inhibition effect on catalysts could be alleviated by improving the oxygen mobility . Hence, the astounding hydrothermal stability of Ni 0.89 Zr 0.11 O 2−δ could be correlated with its high oxygen mobility since there were abundant active oxygen species that participated in the efficient oxidation of methane even under wet conditions.…”
Section: Resultsmentioning
confidence: 99%
“…Similar behaviors were reported for the Pd/ZrO 2 catalysts, where the catalysts with relatively high pore diameters of the support materials displayed better performance. 33,49 O 2 -TPD analysis CH 4 oxidation is strongly reliant on the oxidation state of the active metal in the catalyst. There are many studies on the active phase of the metal for C-H bond activation.…”
Section: Active Surface Areamentioning
confidence: 99%