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Catalytic Resonance Theory: Turnover Efficiency and the Resonance Frequency

Journal Article · · ACS Catalysis
 [1];  [1];  [2];  [3];  [1]
  1. University of Minnesota, Minneapolis, MN (United States)
  2. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  3. University of Minnesota, Minneapolis, MN (United States); University of Houston, TX (United States)

Programmable catalysts exhibiting forced oscillation in the free energy of reacting surface species were simulated to understand the general mechanisms leading to efficient use of the input energy. Catalytic ratchets with either positive or negative adsorbate scaling exhibited oscillation conditions of both high and low turnover efficiency, yielding catalytic turnover frequencies either close to or significantly lower than the applied catalyst oscillation frequency, respectively. The “effective rate”, defined as the product of the catalytic turnover frequency and the turnover efficiency (ηTOE), was limited via two catalytic mechanisms: a leaky catalytic ratchet existed when molecules repeatedly traversed backward through the catalytic transition state upon catalyst oscillation, while a catalytic ratchet with low surface participation exhibited reduced formation of a gas-phase final product due to low surface product coverage. Furthermore, a single applied frequency yielding a maximum effective catalytic rate defined as the “resonance frequency” provided maximum combined benefit for catalytic rate and efficiency.

Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0023464; AC52-07NA27344
OSTI ID:
2483271
Journal Information:
ACS Catalysis, Journal Name: ACS Catalysis; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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