Abstract
The use of FT-IR gas-phase difference spectroscopy for the determination of isotopically labeled species in the study of catalytic reaction mechanisms is illustrated. Applications are based on the study of the mechanism of oxidative coupling of methane over oxide catalysts and include determinations of: (1) deuterated and partially deuterated ethylenes and ethanes from experiments with <sup>2</sup>H labeling of the methane; (2) <sup>18</sup>O contents of CO and CO<sub>2</sub> from experiments with <sup>18</sup>O labeling of O<sub>2</sub>, CO, and CO<sub>2</sub>; (3) <sup>13</sup>C/<sup>12</sup>C ratios in hydrocarbons and carbon oxides from experiments with <sup>13</sup>C labeling of C<sub>2</sub> hydrocarbons. The major limitation of the technique is in regions of strong absorption where nonlinear effects make subtraction difficult; however, this limitation could be alleviated by judicious choice of pathlength. This technique is a powerful supplement to measurements based on mass spectrometry.
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