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Title: Modulating the dynamics of Brønsted acid sites on PtWOx inverse catalyst

Journal Article · · Nature Catalysis
 [1];  [1];  [1]; ORCiD logo [2];  [1]; ORCiD logo [3];  [1]; ORCiD logo [4];  [1];  [1]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [3];  [2];  [1]; ORCiD logo [1]
  1. Univ. of Delaware, Newark, DE (United States)
  2. Univ. of Delaware, Newark, DE (United States); Univ. of Pennsylvania, Philadelphia, PA (United States)
  3. Univ. of Delaware, Newark, DE (United States); Univ. of Massachusetts, Amherst, MA (United States)
  4. Tianjin Univ., Tianjin (China)
  5. Univ. of Delaware, Newark, DE (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  6. University of Chinese Academy of Sciences, Dalian (China)
  7. Shanghai Jiao Tong Univ. (China)
  8. Univ. of Delaware, Newark, DE (United States); Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Here metal-metal oxide (M-MO) inverse catalysts are broadly applied. Brønsted acid sites on the oxide overlayers are often hypothesized to drive selective C-O bond activation. However, the Brønsted acid site nature and dynamics under working conditions remain poorly understood due to multiple materials functionalities. Here, we investigate the formation and the dynamics of Brønsted acid and redox sites on PtWOx/C under working conditions. DFT-based thermodynamic calculations and microkinetic modeling reveal a complex interplay between Brønsted acid and redox sites and potentially fast catalyst dynamics at comparable time scales to the chemistry. Combining in situ characterization and probe chemistry, we demonstrate that the density of Brønsted acid sites on the PtWOx/C inverse catalyst could be modulated by up to two orders of magnitude by altering the reaction parameters and by the chemistry itself. We elicit an order of magnitude increase in the acid-catalyzed dehydration average reaction rate by periodic hydrogen pulsing.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Chinese Academy of Science Youth Innovation Promotion Association; LiaoNing Revitalization Talents Program; National Natural Science Foundation of China
Grant/Contract Number:
SC0012704; SC0001004; AC02-06CH11357
OSTI ID:
1855097
Report Number(s):
BNL-222864-2022-JAAM
Journal Information:
Nature Catalysis, Journal Name: Nature Catalysis Journal Issue: 2 Vol. 5; ISSN 2520-1158
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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