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Title: Selective chemical looping combustion of acetylene in ethylene-rich streams

Journal Article · · Science
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [2];  [2]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]
  1. University of Minnesota, Minneapolis, MN (United States)
  2. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
+ Show Author Affiliations

Here, the requirement for C2H2 concentrations below 2 parts per million (ppm) in gas streams for C2H4 polymerization necessitates its semihydrogenation to C2H4. Here, we demonstrate selective chemical looping combustion of C2H2 in C2H4-rich streams by Bi2O3 as an alternative catalytic pathway to reduce C2H2 concentration below 2 ppm. Bi2O3 combusts C2H2 with a first-order rate constant that is 3000 times greater than the rate constant for C2H4 combustion. In successive redox cycles, the lattice O of Bi2O3 can be fully replenished without discernible changes in local Bi coordination or C2H2 combustion selectivity. Heterolytic activation of C–H bonds across Bi–O sites and the higher acidity of C2H2 results in lower barriers for C2H2 activation than C2H4, enabling selective catalytic hydrocarbon combustion leveraging differences in molecular deprotonation energies.

Research Organization:
University of Chicago, IL (United States)
Sponsoring Organization:
Materials Research Science and Engineering Centers (MRSEC); National Nanotechnology Coordinated Infrastructure (NNCI); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515; SC0023383
OSTI ID:
2520500
Journal Information:
Science, Journal Name: Science Journal Issue: 6735 Vol. 387; ISSN 0036-8075
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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