Abstract
A method based on amine decomposition has been developed for measuring the Brønsted-acid site densities using a standard, tubular reactor with an on-line gas chromatograph (GC). After exposing a sample to n-propylamine vapor and flushing it in flowing He at 473 K, the sample was ramped in flowing He to 773 K while trapping the products in the GC sample loop using liquid nitrogen. Site densities were determined from the quantity of propene formed by the decomposition of the n-propylammonium ions via the Hofmann-elimination reaction. The use of small amounts of sample was shown to be important for elimination of secondary products. The method was tested using H-ZSM-5, H-FER, H-MOR and H-Y zeolites, as well as a γ-Al2O3 sample, and shown to give essentially exact agreement with temperature-programmed desorption and thermogravimetric analysis measurements of n-propylamine performed in vacuum.
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Kresnawahjuesa, O., Gorte, R., de Oliveira, D. et al. A Simple, Inexpensive, and Reliable Method for Measuring Brønsted-Acid Site Densities in Solid Acids. Catalysis Letters 82, 155–160 (2002). https://doi.org/10.1023/A:1020514911456
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DOI: https://doi.org/10.1023/A:1020514911456