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Tuesday, May 19, 2020 | History

2 edition of The reaction of atomic hydrogen with acetylene. found in the catalog.

The reaction of atomic hydrogen with acetylene.

Eric Lars Tollefson

The reaction of atomic hydrogen with acetylene.

by Eric Lars Tollefson

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  • 32 Currently reading

Published .
Written in English


Edition Notes

Thesis (PhD) - University of Toronto, 1948.

The Physical Object
Pagination1 v.
ID Numbers
Open LibraryOL19731553M

The reactions of hydrogen atoms with ethylenimine and N-methylethylenimine produce mainly hydrogen cyanide and methane in the temperature range . Its most singular hazard is associated with its intrinsic instability, especially when it is pressurized: under certain conditions acetylene can react in an exothermic addition-type reaction to form a number of products, typically benzene and/or vinylacetylene, possibly in addition to carbon and hydrogen.

Some Reactions of Atomic Hydrogen in Flames. “The part played by hydrogen atoms in combustion processes”, Influence of molecular hydrogen on acetylene pyrolysis: Experiment and. The chemiluminescence and chemi-ionization resulting from the room temperature reaction of atomic oxygen with acetylene were investigated. The absolute intensity of chemiluminescent radiation and.

@article{osti_, title = {Broensted basicity of atomic oxygen on the Au() surface: reactions with methanol, acetylene, water, and ethylene}, author = {Outka, D A and Madix, R J}, abstractNote = {The adsorption and reactions of methanol, acetylene, water, and ethylene were investigated on clean and oxidized Au() surfaces by temperature-programmed reaction spectroscopy.   Not exactly on the topic of Atomic Hydrogen Welding but I have seen a number of times cutting torches that burn a oxygen Hydrogen mix. If memory serves correct the torch burns about degrees hotter then a more conventional oxygen acetylene cutting torch.


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The reaction of atomic hydrogen with acetylene by Eric Lars Tollefson Download PDF EPUB FB2

The catalytic effect of acetylene on the recombination of atomic hydrogen has been studied and the rate constant of the rate‐determining step calculated to be ×10 −14 molecules −1 cm 3 sec. −1 at 25°C. In contrast with results obtained by the discharge tube method, small amounts of hydrogenated products are by: The thermal dissociation of hydrogen on hot tungsten filaments has been used in the investigation of the reaction of atomic hydrogen with acetylene.

A quantitative method has been developed for the Cited by: The catalytic effect of acetylene on the recombination of atomic hydrogen has been studied and the rate constant of the rate-determining step calculated to be × molecules-1 cm 3 sec at 25°C.

In contrast with results obtained by the discharge tube method, small amounts of hydrogenated products are formed. A study has been made of the rate of recombination of atomic hydrogen in the presence and in the absence of the homogeneous catalyst, acetylene.

The recombination in the absence of acetylene has a negative temperature coefficient and an order between one and by:   The acetylene catalyzed recombination was found to be first order in atomic hydrogen and first order in acetylene, with a rate constant of ×10−14 cc molecules−1 sec.−1 at 17°C.

The effect of temperature on the reaction corresponded to a collision theory activation energy of kcal./mole and a steric factor of 4×10− by: The desorbing acetylene phase which is ob- served when atomic hydrogen is exposed to ad- sorbed ethylene could arise due to scission of adsorbed ethylene followed by the reaction of the resultant surface bound intermediates during the TDS experiment to yield C^Hz.

The reactions of hydrogen atoms with acetylene have been investigated in a flow system, using a mass spectrometer for the determination of the concentrations of the stable and of the transient species. The adsorption of atomic hydrogen on an acetylene-adsorbed Si()-(2×1) surface has been investigated at a surface temperature of K.

The reaction probability of atomic hydrogen for formation of the Si monohydride decreases linearly with the acetylene coverage. However, the terminal coverage does not.

The main reaction products resulting from the addition of atomic hydrogen to acetylene are shown to be ethylene, 1,3-butadiene, and benzene.

The mechanism involves chain reactions of the vinyl and butadienyl radicals, which regenerate atomic hydrogen. Some of the rate parameters are by: An endothermic reaction, with the intensely hot plasma core of the arc providing the dissociation energy.

The atomic hydrogen produced soon recombines; and this recombination is the source of such high temperatures (easily outperforming oxy-hydrogen: oC and oxy-acetylene: oC). So the heat of reaction for the combination of carbon with hydrogen to produce acetylene is kJ.

When one mole of acetylene is produced, kJ of heat are absorbed, making the reaction endothermic. The reactions of hydrogen atoms with acetylene have been investigated in a flow system, using a mass spectrometer for the determination of the concentrations of the stable and of the transient species.

The disappearance of atomic hydrogen can be described by the mechanism H+C 2 H 2 =C 2 H 3*, k 1 =×10 10 cc mole sec Total reaction cross sections for the exchange reactions of atomic hydrogen with C 2 D 4, C 2 D 2 and CH 3 CCD were obtained by the technique of laser induced fluorescence.

The translational energies of nascent D broadened LIF profiles. In all three cases it is shown that the fraction of available energy resulting in translation of the D product does not agree with a statistical model of.

Extensive ab initio Gaussiantype calculations of potential energy surfaces (PES), which are expected to be accurate within 1−2 kcal/mol, combined with statistical theory calculations of reaction rate constants have been applied to study various possible pathways in the hydrogen abstraction acetylene addition (HACA) mechanism of naphthalene and acenaphthalene formation as well as Diels.

The reactions of hydrogen atoms adsorbed on a Ni() surface (surface-bound H) and hydrogen atoms just below the surface (bulk H) with coadsorbed acetylene are probed under ultrahigh vacuum conditions. Bulk H is observed to react with acetylene upon emerging onto the surface at K.

Gas-phase hydrogenation products, ethylene and ethane, are produced as well as an adsorbed. Carbon-atomic hydrogen discharge reaction Hyman D. Cesser and Joseph J.

Czubryt Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2 (Received 19 June revised 13 August ) The reaction of hydrogen atoms produced in a low-pressure electrical AC discharge with graphite electrodes was shown to produce primarily CH4 and C^H^ and, to a lesser.

The chemical reactions occurring at a CVD diamons surface exposed to methyl and acetylene species have been studied under high vacuum conditions, prim.

Nonlocal gradient-corrected periodic density functional theory (DFT) calculations have been carried out to examine the hydrogenation of acetylene over Pd().

The binding energies of acetylene, atomic hydrogen, vinyl, and ethylene at 25% (33%) coverage were computed to be − (−), − (−), − (−), and −82 (−62) kJ/mol, respectively. The reaction energy for. Abstract. The technique of flash photolysis coupled with time resolved detection of H via resonance fluorescence has been used to obtain absolute rate parameters for the reaction of atomic hydrogen with acetylene, i.e., H+C 2 H 2?C 2 H 3 * (1); C 2 H 3 *+M→C 2 H 3 +M (2).

The rate constant for the reaction is strongly pressure dependent and. Selected ion flow drift tube studies of the reactions of Si + (2 P) with HCl, H 2 O, H 2 S, and NH 3: Reactions which produce atomic hydrogen. The Journal of Chemical Physics.

The chemical reaction dynamics to form d1-diacetylene, DCCCCH (X 1 Σ +), and the d1-butadiynyl radical, DCCCC, via the reaction of d1-ethinyl, C 2 D (X 2 Σ +), with acetylene, C 2 H 2 (X 1 Σ g +), are explored in a crossed molecular beam experiment at an average collision energy of kJ mol − experiments show that the reaction follows indirect scattering dynamics via a C 4 H 2 D.

Unfortunately, this reaction would be virtually impossible to perform in the laboratory because carbon would react with hydrogen to form many different hydrocarbon products simultaneously. There is no way to create conditions under which only acetylene would be produced.We carried out the crossed molecular beam reaction of ground state methylidyne radicals, CH(X 2 Π), with acetylene, C 2 H 2 (X 1 Σ g +), at a nominal collision energy of kJ mol − single collision conditions, we identified both the atomic and molecular hydrogen loss pathways forming C 3 H 2 and C 3 H isomers, respectively.

A detailed analysis of the experimental data suggested.