Block diagram of the low-pressure microreactor system.
Detailed description of the low-pressure microreactor system with the gas mixing unit, gas flow control, microreactor and pressure control, pumping stage and the differentially pumped gas analysis section. For a description of the respective parts see the text.
Calibration of the capillaries: Evolution of the pressure as a function of time upon gas flow through one of the different capillaries into the evacuated reactor [, , , : capillary, 엯: capillary, : capillary, : capillary].
Schematic description of the heated quartz tube used for reactor heating. In the middle part the outer ceramic layer is not shown to illustrate the position of the heating wires.
Pressure dependence of the reaction rate for CO oxidation at a constant contact time of and variable reactor pressure, , (1% CO, 1% in , . The higher values of the reaction rates were obtained after on stream, the lower values after additional reaction (at the points lie on top of each other). Measurements in a standard plug-flow micro-reactor at atmospheric pressure prior to deactivation (empty triangle) and after on stream (filled triangles) are included for comparison. Empty circle: extrapolated rate at the start of the reaction at in the low-pressure reactor, using the deactivation measured in the standard microreactor.
Pressure calculated for the different capillaries for a constant contact time of , using the effective capillary diameters (prepressure , reactor pressure , and gas flow rates are given).
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