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Notes

Comparison of Static and Dynamic Chemisorption Measurements

In previous issues of Altamira Notes we have discussed the use of pulse chemisorption and temperature-programmed desorption, i.e. dynamic techniques, for catalyst characterization. One question that is often asked is how do results from these techniques compare with results obtained from static volumetric chemisorption methods? This Note compares results for various catalysts obtained by both static and dynamic methods.

Conditions and Parameters for TPD Experiments: Supported Metal Catalysis

Previous Altamira Notes have discussed the use of temperature programmed desorption (TPD) for characterizing the surfaces of metallic catalysts1,2 and acid catalysts3. In this note, we discuss the selection of some critical experimental parameters necessary for conducting a successful TPD experiment on supported metal catalysts.  

Development of a New Detection Method for TPO Analysis of Coke Deposits

Today, techniques such as TEM, Laser Raman Spectroscopy, EELS,13C NMR, and temperature-programmed oxidation (TPO) are used to study coked catalysts. Probably the most widely used technique is TPO. This Altamira Note discusses the use of TPO coupled with a new detection method developed by Dr. S.C. Fung and Dr. C.A. Querini at Exxon Research and Engineering Company. This method is simple and permits the continuous monitoring of the rate of coke oxidation.