10.1021/acssuschemeng.8b01543.s001
Shazia
S. Satter
Shazia
S.
Satter
Takuro Yokoya
Takuro
Yokoya
Jun Hirayama
Jun
Hirayama
Kiyotaka Nakajima
Kiyotaka
Nakajima
Atsushi Fukuoka
Atsushi
Fukuoka
Oxidation of Trace Ethylene at 0 °C over Platinum
Nanoparticles Supported on Silica
American Chemical Society
2018
CO 2
fixed-bed flow reactor
Pt nanoparticles
catalyst
SBA
ethylene conversion
2018-08-06 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Oxidation_of_Trace_Ethylene_at_0_C_over_Platinum_Nanoparticles_Supported_on_Silica/6972863
Oxidation of trace
ethylene (50 ppm) at 0 °C was systematically
studied using Pt nanoparticles supported on mesoporous silica (SBA-15)
in a fixed-bed flow reactor. The SBA-15 supported Pt catalyst (1.8
wt % Pt loading) exhibited an ethylene conversion higher than 99%
at the initial stage, which gradually began to decrease at 90 min
and reached 33% within 240 min. The CO<sub>2</sub> yield was lower
than the corresponding ethylene conversion before the steady state
was reached. This was due to the formation of intermediates that were
stabilized on the catalyst surface. These intermediates could be recovered
in the form of CO<sub>2</sub> by heating the spent catalyst in a mixed
N<sub>2</sub> and He (1:19, v/v) flow at 150 °C. The addition
of water vapor to the catalyst bed decreased the original activity
drastically because physically adsorbed water molecules partly blocked
the active Pt sites. Control experiments using nonordered silica supports
(Aerosil 380 and 200) showed similar catalytic behavior as that observed
with SBA-15. The formation of highly dispersed Pt nanoparticles on
the silica surfaces is thus the key to the development of effective
Pt catalysts for low-temperature oxidation of ethylene.