Near-Unity
Reaction Probability in Olefin Hydrogenation
Promoted by Heterogeneous Metal Catalysts
Maryam Ebrahimi
Juan Pablo Simonovis
Francisco Zaera
10.1021/jz500954g.s001
https://acs.figshare.com/articles/journal_contribution/Near_Unity_Reaction_Probability_in_Olefin_Hydrogenation_Promoted_by_Heterogeneous_Metal_Catalysts/2034825
The
kinetics of the hydrogenation of ethylene on platinum surfaces
was studied by using high-flux effusive molecular beams and reflection–absorption
infrared spectroscopy (RAIRS). It was determined that steady-state
ethylene conversion with probabilities close to unity could be achieved
by using beams with ethylene fluxes equivalent to pressures in the
mTorr range and high (≥100) H<sub>2</sub>:C<sub>2</sub>H<sub>4</sub> ratios. The RAIRS data suggest that the high reaction probability
is possible because such conditions lead to the removal of most of
the ethylidyne layer known to form during catalysis. The observations
from this study are contrasted with those under vacuum, where catalytic
behavior is not sustainable, and with catalysis under more realistic
atmospheric pressures, where reaction probabilities are estimated
to be much lower (≤1 × 10<sup>–5</sup>).
2015-12-17 02:43:28
reaction probability
platinum surfaces
mTorr range
ethylene fluxes equivalent
RAIRS data
Heterogeneous Metal Catalysts
ethylidyne layer
ethylene conversion
catalysi
Olefin Hydrogenation Promoted
reaction probabilities