The Research of Gas Adsorption on Catalysts & Adsorbents
The investigation of gas adsorption on catalysts and more generally solid adsorbents requires a very good interaction between the reactive gas and the powder. The Calvet-type DSC offers the main advantage to work with an open tube detection. This configuration allows the adaptation of different types of experimental crucibles, especially with the possibility of introduction of various types of gas under normal or high pressure. The quartz tube reactor is one option for the applications on catalysts, and more generally for all the adsorption investigations. It makes possible the simulation of the use of a plug-flow fixed bed reactor in heterogeneous catalysis.
EXPERIMENTAL
The quartz tube (Figure 1) is introduced in the Calvet type DSC, set in the vertical position (Figure 2). A sintered silica glass frit located in the middle of the tube to receive the powdered sample in order to be surrounded by the calorimetric detector. Tight connections are adjusted at both ends of the tubes for the gas inlet and outlet. With such an experimental design, the reactive gas goes through the powdered sample.
The gas can be introduced with a continuous flow, but more generally a gas injection loop is used to produce pulses of known volume of reactive gas. As a quartz tube is used, any type of reactive gas, even corrosive, can be used. The connection with a gas analyzer (GC, MS, FTIR) is very easy to perform.
RESULTS
Such a quartz tube reactor has been used for different applications in the field of catalysis with different EGA combinations. Some examples are given in this application note:
- Heat of adsorption of NH3 on Cu-Beta zeolite
- Reaction of NO, NH3, and 02, over V2O5 on a TiO2/SiO2 catalyst as a function of temperature
- Ammonia adsorption on a sulfonated polystyrene resin-type catalyst (Amberlyst 15)
- Catalytic oxidation of propane
- Interaction of carbon monoxide with zeolites
For further application details, please download the article here:
AN674 – GAS ADSORPTION ON CATALYSTS AND ADSORBENTS USING A QUARTZ TUBE REACTOR ON A CALVET TYPE DSC