Abstract
This work shows how the effects obtained by differential scanning calorimetry (DSC) can be thermally nullified such as to obtain in thermograms only effects due to an added or created material. Conventional and nullifying DSC measurements are compared for evaluating acid site strength distribution (ASSD) in erionite (zeolite) and deammoniation of NH
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-exchanged erionite. Incorrect pretreatment of a sample or its reference material is shown to lead to erroneous interpretation of the DSC nullifying technique data.