Readily Constructed Glass Piston Pump for Gas Recirculation
2020
The recirculation
of gases in a sealed reactor system is a broadly
useful method in catalytic and electrocatalytic studies. It is especially
relevant when a reactant gas reacts slowly with respect to residence
time in a catalytic reaction zone and when mass transport control
through the reaction zone is necessary. This need is well illustrated
in the field of electrocatalytic N2 reduction, where the
need for recirculation of 15N2 has recently
become more apparent. Herein, we describe the design, fabrication,
use, and specifications of a lubricant-free, readily constructed recirculating
pump fabricated entirely from glass and inert polymer (poly(ether
ether ketone) (PEEK), poly(tetrafluoroethylene) (PTFE)) components.
Using these glass and polymer components ensures chemical compatibility
between the piston pump and a wide range of chemical environments,
including strongly acidic and organic electrolytes often employed
in studies of electrocatalytic N2 reduction. The lubricant-free
nature of the pump and the presence of components made exclusively
of glass and PEEK/PTFE mitigate contamination concerns associated
with recirculating gases saturated with corrosive or reactive vapors
for extended periods. The gas recirculating glass pump achieved a
flow rate of >500 mL min–1 N2 against
atmospheric pressure at 15 W peak power input and >100 mL min–1 N2 against a differential pressure of
+6 in. H2O (∼15 mbar) at 10 W peak power input.
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