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Atomic Pd-promoted ZnZrOx solid solution catalyst for CO2 hydrogenation to methanol.
- Source :
-
Applied Catalysis B: Environmental . May2022, Vol. 304, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- The development of efficient CO 2 conversion catalysts is a long-lasting desire. Herein, we introduce an atomic Pd-promoted ZnZrO x solid solution catalyst (Pd-ZnZrO x), which shows markedly enhanced rate of methanol production compared to bare ZnZrO x , as well as excellent stability over 100 h on stream. Up to 0.8 at% (i. e. 0.6 wt%), Pd can be atomically dispersed in ZnZrO x , leading to more oxygen vacancies on the mixed oxide that foster methanol production. Kinetic analysis and in situ DRIFTS reveal that hydrogen activation is limited on ZnZrO x , but Pd doping facilitates H 2 dissociation as well as the consequent formation of HCOO*, thus boosting CO 2 conversion to methanol. DFT analyses suggest that the presence of atomic Pd enables a more exothermic H 2 dissociation, which increases the availability of surface H and facilitates CO 2 hydrogenation on adjacent Zn sites, providing rationale on the high activity and robustness of Pd-ZnZrO x in CO 2 hydrogenation. [Display omitted] • Coprecipitation of Zn, Zr, and Pd precursors forms atomically dispersed Pd on ZnZrO x. • Atomic Pd-doping leads to higher concentration of surface oxygen vacancies. • Atomic Pd-promoted ZnZrO x shows excellent CO 2 hydrogenation activity and lifetime. • Pd promotes H 2 splitting and the stabilization of key intermediates for CH 3 OH. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SOLID solutions
*HYDROGENATION
*CATALYSTS
*CARBON dioxide
*METHANOL production
Subjects
Details
- Language :
- English
- ISSN :
- 09263373
- Volume :
- 304
- Database :
- Academic Search Index
- Journal :
- Applied Catalysis B: Environmental
- Publication Type :
- Academic Journal
- Accession number :
- 154537744
- Full Text :
- https://doi.org/10.1016/j.apcatb.2021.120994