Design and fabrication of an automated thermal desorption gas-solid reaction system: Oxidation of ammonia and methanol over YBa2Cu3O7−δ(123) oxide systems

Abstract

A fully automated, versatile Temperature Programmed Desorption (TDP), Temperature Programmed Reaction (TPR) and Evolved Gas Analysis (EGA) system has been designed and fabricated. The system consists of a micro-reactor which can be evacuated to 10-6 torr and can be heated from 30 to 750~ at a rate of 5 to 30~ per minute. The gas evolved from the reactor is analysed by a quadrupole mass spectrometer (1-300 amu). Data on each of the mass scans and the temperature at a given time are acquired by a PC/AT system to generate thermograms. The functioning of the system is exemplified by the temperature programmed desorption (TPD) of oxygen from YBa2Cu3_xCoxO 7 + 6, catalytic ammonia oxidation to NO over YBa2 Cu3 07-~ and anaerobic oxidation of methanol to CO2, CO and H20 over YBa2CuaOT-~ (Y123) and PrBa2Cu307_8 (Pr123) systems.

Ni2Mo3N: A New Ternary Interstitial Nitride with a Filled β-Manganese Structure

“…Electron diffraction patterns were obtained using a JEOL 200CX transmission electron microscope (TEM) to elucidate microstructural features. The sample was heated in oxygen atmosphere in a temperature-programmed reaction (TPR) system attached to a VG QXK300 quadrupole mass spectrometer to study nitride phase formation. In a typical experiment, about 200 mg of the sample was loaded and the reactor was evacuated to 10 -6 Torr.…”

New Uniform Solid Catalyst for the Low-Temperature Oxidation of Carbon Monoxide: A Triple-Layered Rare Earth Perovskite Containing Co and Cu Ions

“…The oxygen contents of the samples were determined by iodometric titration. The thermal desorption of oxygen and stoichiometric and catalytic oxidations were carried out employing home-built equipment . In a typical desorption experiment, 250 mg of the solid was placed in an 8 mm diameter, continuous flow, cylindrical quartz reactor.…”