What is TPR profile?
By measuring the consumption of hydrogen as a function of temperature, a so-called TPR profile is obtained. The use of such profiles provides fingerprints of the chemi- cal nature and environment of the catalytic component.
What is TPO and TPR?
Temperature Programmed Analytical Options Temperature Programmed Desorption (TPD) Temperature Programmed Reduction (TPR) Temperature Programmed Oxidation (TPO) Our temperature programmed analytical options are chemisorption analyses used to investigate desorption, oxidation and reduction as a function of temperature.
What is NH3 TPD?
The NH3-TPD profile of Cu-CHA is characterized by three desorption peaks [8–17]; a low-temperature peak below 200◦C , an intermediate-tem- perature peak at 250−350◦C and a high-temperature peak at 400−500◦C. The low-temperature peak is generally assigned to NH3. adsorbed to Lewis acid sites [8–13, 17] whereas the peak.
What is co2 TPD?
Temperature-programmed desorption (TPD) is used to evaluate the amount and types of oxygen-containing surface groups in carbon materials. The key principle is to heat material in an inert atmosphere and record spectra of exhaling gases (CO and CO2) by quadrupole mass spectrometry.
What is TPO analysis?
Temperature programmed oxidation (TPO) is an analytical technique capable of characterising catalysts and is an important consideration for research and development.
What is reduced pressure of a gas?
The reduced pressure is defined as its actual pressure divided by its critical pressure.
What is temperature-programmed reduction?
Temperature-programmed reduction ( TPR) is a technique for the characterization of solid materials and is often used in the field of heterogeneous catalysis to find the most efficient reduction conditions, an oxidized catalyst precursor is submitted to a programmed temperature rise while a reducing gas mixture is flowed over it.
Can temperature programmed reduction with hydrogen be used to characterize reducible solids?
Temperature programmed reduction (TPR) with hydrogen is a widely used technique for the characterization of reducible solids and catalysts. The application of this technique in the frame of the EUROCAT Oxide-1 project has been reported previously .
What is the temperature of the second stage of reduction?
A second stage of reduction starts around 1050 K and is not finished until the maximum temperature is reached (E-2: 1140 K, D-1: 1273 K, CH-1: 1473 K).
What are the heating and reduction rates of a hydrogen detector?
Heating rates are usually between 1 K/min and 20 K/min. If a reduction takes place at a certain temperature, hydrogen is consumed, which is recorded by the detector. In practice the production of water is a more accurate way of measuring the reduction.