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CO2-mediated oxidative dehydrogenation of propane enabled by Pt-based bimetallic catalysts

Journal Article · · Chem
 [1];  [2];  [3];  [1];  [4];  [4];  [5];  [2];  [1]
  1. Louisiana State Univ., Baton Rouge, LA (United States)
  2. Columbia Univ., New York, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
  3. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
  5. Brookhaven National Laboratory (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
The greenhouse gas CO2 is a promising soft oxidant for the oxidative dehydrogenation of light alkanes. However, the occurrence of side reactions including cracking, hydrogenolysis, and reforming results in lower olefin yields compared with direct dehydrogenation. Here, we report that Pt-M (M = Sn/In/Zn) bimetallic catalysts on non-redox-active silica support can break the equilibrium limit of direct propane dehydrogenation using CO2 as a co-reactant to consume the hydrogen formed in propane dehydrogenation. Unlike the commonly postulated direct CO2-assisted dehydrogenation mechanism, we confirm that CO2-oxidative dehydrogenation of propane (ODHP) proceeds in two tandem steps on these bimetallic catalysts, i.e., propane dehydrogenation and reverse water-gas shift, with the latter being the rate-determining step. In situ X-ray absorption studies and density functional theory calculations suggest that the PtmMn-MOx (e.g., Pt3Sn-SnOx) interfaces are likely active sites.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC05-00OR22725; SC0012653; SC0012704
OSTI ID:
2224166
Alternate ID(s):
OSTI ID: 2281331
Report Number(s):
BNL--225163-2024-JAAM
Journal Information:
Chem, Journal Name: Chem Journal Issue: 11 Vol. 9; ISSN 2451-9294
Publisher:
Cell PressCopyright Statement
Country of Publication:
United States
Language:
English

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