Application of a cw quantum cascade laser CO_2 analyser to catalytic oxidation reaction monitoring

摘要

Catalytic oxidation reaction monitoring has been performed for the first time with a trace gas carbon dioxide analyser based on a continuous wave (cw), thermoelec-trically cooled (TEC), distributed feedback (DFB) quantum cascade laser (QCL) operating at around 2307 cm ~(-1). The reaction kinetics for carbon monoxide oxidation over a platinum catalyst supported on yttria-stabilised zirconia were followed by the QCL CO_2 analyser and showed that it is a powerful new tool for measuring low reaction rates associated with low surface area model catalysts operating at atmospheric pressures. A detection limit was determined of 40 ppb (1 standard deviation) for a 0.1 s average and a residual absorption standard deviation of 1.9×10~(-4).