What is difference between these three terms and in contexts with zeolites how one can learn ?
Good morning,
this are different thermal analysis methods to characterizes materials.
TPD (temperature programmed desorption) The zeolite (or other material) is "loaded" with a gas, which adsorbes to the zeolite (e.g. ammonia), then this probe molecule is stepwise desorbed. The analysis of the desorption curve allows to differentiate the adsorption site of the zeolite. For example basic molecules like ammonia allow to discriminate between Lewis and Brønsted acid sites.
TPR (temperature programmed reduction) and TPR (temperature programmed oxidation) are used to quantivy the amount of oxidatable or reductable material. For zeolites it is used to identify (and quantify) the oxidation state of a metal loading.
I have attached a few papers to illustrate this methods. The one written by Chang et al describes all three methods for analysis of a Fe-ZSM-5. The two written by Luz Rodríguez-González are from my former group and are dealing with ammonia TPD and the different ammonia spezies in zeolites.
Article N2O decomposition over [Fe]-ZSM-5 and Fe-HZSM-5 zeolites
Article NH3-TPD measurements using a zeolite-based sensor
Article Correlation of TPD and impedance measurements on the desorpt...
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