| 摘要 |
A copper catalyst maintained in the temperature range of 220 DEG to 240 DEG C. is employed to convert nitrogen dioxide to nitric oxide, as in the measurement of oxides of nitrogen by chemiluminescent techniques. The converter comprises a body having a bore receiving a copper tube coaxially, the tube being spaced from the wall of the bore so that a gas containing nitrogen dioxide may flow along the exterior of the tube and then through the interior of the tube, which contains copper granules held in place by plugs of copper turnings. The temperature of the body is maintained by heater tape wound about the body, and the body is enclosed within an insulated container.
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