AutoChem and Mass Spectrometer Gas Calibration

The AutoChem TCD level calibration is a powerful tool for converting raw TCD signals to gas concentrations. This built-in calibration provides the AutoChem with known gas concentrations and records the TCD signal associated with each one. The concentration and signal data are then used to generate a polynomial for converting TCD signals to gas concentrations. […]

Thermocouple Calibration for the AutoChem – Thermostar Interface

Micromeritics’ AutoChem series of instruments is equipped with both digital and analog I/O (inputs/outputs), which may be used to control a Pfeiffer Vacuum Thermostar mass spectrometer via a single interface (Micromeritics’ part number 291/60811/00). This cable has been specifically designed to provide the hardware interface between the two instruments. The single-connector cable end is attached […]

Characterization of Acid Sites Using Temperature-Programmed Desorption

Temperature-Programmed Desorption (TPD) is one of the most widely used and flexible techniques for characterizing the acid sites on oxide surfaces1-5. Determining the quantity and strength of the acid sites on alumina, amorphous silica-alumina, and zeolites is crucial to understanding and predicting the performance of a catalyst. For several significant commercial reactions (such as n-hexane […]

Acid Site Characterization of NH4+ ZSM-5 (SiO2/Al2O3:30/1): A Pulse Chemisorption and TPD Application for the AutoChem

The Brønstead acidity of zeolites and other catalysts is of keen interest, as this affects the kinetics of reactions. Characterization of these sites is consequently very important and is often performed according to the ASTM D 4824 ammonia chemisorption method. An alternative, but comparable, characterization method involves pulse chemisorption of propylamines followed by a temperature […]

Establishing Sample Degassing Conditions for the FlowSorb

Sample preparation is crucial in obtaining reliable, repeatable results with the FlowSorb just as it is with all physical adsorption instruments. Users typically establish the temperature-time parameter that gives consistent results by heating samples of the material to be analyzed to various temperatures for different times and then measuring surface areas, or they merely choose […]

Acid Site Characterization of NH4+ ZSM-5 (SiO2/ Al2O3:280/1): A Pulse Chemisorption and TPD Application for the AutoChem

The Brønstead acidity of zeolites and other catalysts is of keen interest, as this affects the kinetics of reactions. Characterization of these sites is consequently very important and is often performed according to the ASTM D 4824 ammonia chemisorption method. An alternative, but comparable, characterization method involves pulse chemisorption of propylamines followed by a temperature-programmed […]

Acid Site Characterization of NH4+ ZSM-5(SiO2/Al2O3:80/1): A Pulse Chemisorption and TPDApplication for the AutoChem

The Brønstead acidity of zeolites and other catalysts is of keen interest, as this affects the kinetics of reactions. Characterization of these sites is consequently very important and is often performed according to the ASTM D 4824 ammonia chemisorption method. An alternative, but comparable, characterization method involves pulse chemisorption of propylamines followed by a temperature-programmed […]

Acid Site Characterization of NH4+ ZSM-5 (SiO2/ Al2O3:50/1): A Pulse Chemisorption and TPD Application for the AutoChem

The Brønstead acidity of zeolites and other catalysts is of keen interest, as this affects the kinetics of reactions. Characterization of these sites is consequently very important and is often performed according to the ASTM D 4824 ammonia chemisorption method. An alternative, but comparable, characterization method involves pulse chemisorption of propylamines followed by a temperature-programmed […]

Acid Site Characterization of H+ Y (SiO2/Al2O3:80/1): A Pulse Chemisorption and TPD Application for the AutoChem

The Brønstead acidity of zeolites and other catalysts is of keen interest, as this affects the kinetics of reactions. Characterization of these sites is consequently very important and is often performed according to the ASTM D 4824 ammonia chemisorption method. An alternative, but comparable, characterization method involves pulse chemisorption of propylamines followed by a temperature-programmed […]

Acid Site Characterization of H+ Y (SiO2/Al2O3:30/1): A Pulse Chemisorption and TPD Application for the AutoChem

The Brønstead acidity of zeolites and other catalysts is of keen interest, as this affects the kinetics of reactions. Characterization of these sites is consequently very important and is often performed according to the ASTM D 4824 ammonia chemisorption method. An alternative, but comparable, characterization method involves pulse chemisorption of propylamines followed by a temperature-programmed […]