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A novel method for NH 3 -TPD measurements based on impedance spectroscopy (IS), denoted as IS-TPD, is presented. It applies a highly sensitive zeolite-based NH 3 -sensor instead of gas chromatography used in the conventional NH 3 -TPD. The zeolite samples were coated in the form of a thick-film on a directly heated inter-digital electrode (ide) chip. Altogether this set-up allows to substantially reduce the sample mass and to minimize temperature gradients.

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