Abstract
The adsorption properties of nitric oxide (NO) on alumina supported palladium were studied by a simultaneous thermogravimetric-analysis and differential-scanning-calorimetry (TGA-DSC) in a temperature ranges between 220 and 470 K. Upon adsorption, NO molecules on both Pd/Al 2O 3 and Pd/NaOH-Al 2O 3 samples were molecularly adsorbed between 220 and 300 K. Some NO molecules were strongly adsorbed on Pd/NaOH-Al 2O 3 and possessed a higher enthalpy of adsorption [∼140 kJ (mol NO) −1] than Pd/Al 2O 3 [∼114 kJ (mol NO) −1]. Upon heating above 320 K, the adsorbed NO molecule on these palladium surface was dissociated. In addition, a temperature programmed desorption and mass spectrometer (TPD–MS) study in a temperature range between 300 and 1100 K further indicated that some strongly adsorbed NO molecules may stay on basic sites (∗ b) and Pd–NaOH interface sites (∗ i) to enhance the decomposition of NO.
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