Thermal Decomposition Of Ammonia Research Articles

Nitridation characteristics of floating aluminium powder

Experimental parameters for floating nitridation process were examined to study the effect on moving behaviour and direct nitridation characteristics of aluminium powder, which was carried over from a fluidized bed. The conversion increased with increasing reactor temperature and mole ratio of ammonia to aluminium. It was also strongly dependent on the thermal decomposition of ammonia participated in the reaction. Aluminium powder was converted to aluminium nitride as high as 0.90 when the reactor temperature was 1300 °C and the mole ratio was 19.5 The particle size and specific surface area of the powder increased with increasing conversion, which was due to the volumetric and structural change of aluminium particles when nitrided to form fine crystallites with higher porosity.

N2H4 and NH3 as precursors for silicon nitride thin film growth

The thermal decomposition of ammonia (NH3) and hydrazine (N2H4) on the Si(100) surface has been characterized using Auger electron spectroscopy (AES), temperature programmed desorption, and low energy electron diffraction (LEED). Successive cyclic dosing of the Si(100)-(2×1) [E. A. Wood, J. Appl. Phys. 35, 1306 (1964); H. H. Farrell, F. Stucki, J. Anderson, D. J. Frankel, G. J. Lapeyre, and M. Levinson, Phys. Rev. B 30, 721 (1984)] surface with the nitride precursor resulted in the formation of an amorphous nitride layer as indicated by LEED. Hydrazine nitrided the Si(100)-(2×1) surface much more rapidly than ammonia, as shown by a comparison of the AES nitridation curves for NH3 and N2H4. These nitridation curves have very different slopes and clearly have different functional forms. The marked difference in nitride formation rates during cyclic dosing and heating, along with the absence of NH3 desorption during N2H4 decomposition, suggest that NH3 and N2H4 may result in the formation of different types of nitride overlayer and/or have different thermal decomposition mechanisms.

Adsorption and thermal decomposition of ammonia on a Ni(110) surface: Isolation and identification of adsorbed NH 2 and NH

Adsorption and thermal decomposition of ammonia on a Ni(110) surface: Isolation and identification of adsorbed NH 2 and NH

Adsorption and thermal decomposition of ammonia on a Ni(110) surface: Isolation and identification of adsorbed NH 2 and NH

Adsorption and thermal decomposition of ammonia on a Ni(110) surface: Isolation and identification of adsorbed NH 2 and NH

Rate constants of chemical reactions in the high temperature pyrolysis of ammonia

Rate constants of chemical reactions in the high temperature pyrolysis of ammonia

On the thermal decomposition of ammonia behind shock waves

On the thermal decomposition of ammonia behind shock waves

Thermal decomposition of ammonia in shock waves

AbstractThe thermal decomposition of ammonia was studied by means of the shock‐tube and vacuum ultraviolet absorption spectroscopy monitoring the concentration of atomic hydrogen. The rate constants of both the initiation reaction equation image and the consecutive reaction equation image were determined directly as and respectively.

Thermal decomposition of ammonium Y zeolite

Thermal decomposition of ammonium Y zeolite

Shock wave studies in nitrogen + hydrogen systems. Part 4.—Thermal decomposition of ammonia

The decomposition of ammonia has been studied in shock waves over the temperature range 2000–3000°K by following the NH3 concentration using the infra-red emission at 3µ and the NH concentration using the ultra-violet absorption at 3360A. The ammonia dissociates by the reaction, NH3+Ar→NH2+H+Ar, with a rate constant of 1012.60 exp(–83 kcal/RT) l. mole–1 sec–1 and NH is formed by the sequence, NH2+NH3→N2H3 N2H3→NH+NH2. The first reaction is rate controlling and has an activation energy of ca. 27 kcal/mole.

Organic reactions catalyzed by crystalline aluminosilicates: III. Condensation reactions of carbonyl compounds

Organic reactions catalyzed by crystalline aluminosilicates: III. Condensation reactions of carbonyl compounds

Organic reactions catalyzed by crystalline aluminosilicatesI. Alkylation reactions

Organic reactions catalyzed by crystalline aluminosilicatesI. Alkylation reactions

Shock wave studies in nitrogen + hydrogen systems. Part 3.—Thermal decomposition of ammonia

Shock wave studies in nitrogen + hydrogen systems. Part 3.—Thermal decomposition of ammonia

A MODIFIED FLOW METHOD FOR MEASURING THE VELOCITIES OF GAS REACTIONS

A modified flow method has been devised for measuring the velocities of gas reactions, which enables observations to be made by pressure readings rather than by tedious analytical methods. In principle the method consists of passing the reactants through a flow-meter, then through a heated reaction chamber, and finally through a second flow-meter. The ratio of the two flow-meter readings, corrected for the change in the viscosities of the gases, gives a direct measure of the extent to which the reaction has progressed. As a test of the method the thermal decomposition of ammonia on the surface of silica has been investigated.

I.—The thermal decomposition of ammonia, with particular reference to the existence of active and inactive phases of ammonia

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The Thermal Decomposition of Ammonia upon Mixed Surfaces of Tungsten and Platinum

The Thermal Decomposition of Ammonia upon Mixed Surfaces of Tungsten and Platinum

The Thermal Decomposition of Ammonia upon the Surface of a Molybdenum Wire

The Thermal Decomposition of Ammonia upon the Surface of a Molybdenum Wire

CLIII.—The thermal decomposition of ammonia upon various surfaces

CLIII.—The thermal decomposition of ammonia upon various surfaces