期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 316, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121669
关键词
Methanol steam reforming; Hydrogen production; Metal@zeolite catalyst; K promoter; Synergistic effect
资金
- National Natural Science Foundation of China [21776296, 21905291, 22108289]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21090201]
- Shanghai Sailing Program [19YF1453000]
- Shanghai Institute of Cleantech Innovation [CR190904, CR190905]
In this study, an efficient K-modified Pt catalyst confined within silicate-1 zeolite was developed for methanol steam reforming. The Pt-K@S-1 catalyst exhibited a synergistic effect between Pt0 and Pt delta+ species, suppressing the formation of CO and boosting the production of H2.
Methanol is a suitable raw material for in situ hydrogen generation by steam reforming that enables the safe storage and transportation of hydrogen. Pt-based catalysts have been considered promising and effective for methanol steam reforming but suffer from deactivation by metal sintering. In this study, we developed an efficient K-modified Pt catalyst confined within silicate-1 zeolite with a high activity and unprecedented stability for methanol steam reforming. Owing to the confinement effect, the K-promoted Pt@S-1 catalyst remained stable for more than 50 h. The combination of TPSR-MS and DFT calculations revealed that the Pt-K@S-1 catalyst exhibited a synergistic effect between the Pt0 and Pt delta+ species. The cleavage of the O-H bond in CH3OH was activated over Pt0 sites to produce HCOOCH3, whereas Pt delta+ sites promoted the hydrolysis of HCOOCH3 to HCOOH and ultimately CO2 and H2, thus suppressing the formation of CO and boosting H2 production.
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