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Decomposition Kinetics of H2O2 on Pd Nanocrystals with Different Shapes and Surface Strains

Journal Article · · ChemCatChem
 [1];  [2];  [3];  [4];  [4];  [4];  [5];  [3]
  1. Georgia Institute of Technology, Atlanta, GA (United States); University of Wisconsin–Madison Department of Chemical and Biological Engineering
  2. Univ. of Wisconsin, Madison, WI (United States); Cairo Univ., Giza (Egypt)
  3. Georgia Institute of Technology, Atlanta, GA (United States); Emory Univ., Atlanta, GA (United States)
  4. Georgia Institute of Technology, Atlanta, GA (United States)
  5. Univ. of Wisconsin, Madison, WI (United States)
+ Show Author Affiliations
Direct synthesis of hydrogen peroxide (H2O2) from H2 and O2 on a Pd-based catalyst has emerged as a promising route to replace the energy-consuming, highly inefficient anthraquinone process. However, Pd is also a good catalyst for the decomposition of H2O2, thereby compromising the selectivity toward the desired product. The coupling between the formation and decomposition reactions makes it difficult to single out the most important parameter that controls the selectivity toward direct synthesis of H2O2. Herein, support-free monometallic Pd nanocrystals with different shapes and surface strains are used to investigate their impacts on the decomposition kinetics of H2O2. The kinetics are analyzed by tracking the concentration of the remaining H2O2 using infrared spectroscopy. The data indicates that both surface structure and strain affect the decomposition kinetics of H2O2, but their impacts are inferior to that caused by Br–, a surface capping agent for the Pd{100} facets. The experimental results are consistent with the trend obtained through density functional theory calculations. Furthermore, this work helps shed light on the development of Pd-based catalysts for the direct synthesis of H2O2 by offering strategies to mitigate the decomposition of the desired product.
Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; FG02-05ER15731
OSTI ID:
1960311
Alternate ID(s):
OSTI ID: 1882783
Journal Information:
ChemCatChem, Journal Name: ChemCatChem Journal Issue: 16 Vol. 14; ISSN 1867-3880
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (6)

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Figure 2(p. 5)figure Figure 2
Table 1(p. 5)table Table 1
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Figure 5(p. 11)figure Figure 5

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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structure-property relationship