Kinetics and morphology in the reaction between cuprous sulphide and hydrogen

  • 79 Pages
  • 3.23 MB
  • English
Helsinki University of Technology, Laboratory of Process Metallurgy , Helsinki
Cuprous sulphide., Hydrogen., Chemical kine
StatementJuho Mäkinen.
LC ClassificationsQD181.C9 M33
The Physical Object
Pagination79 p. :
ID Numbers
Open LibraryOL4288055M
LC Control Number78315018

Cuprous sulfide pellet, iii) chemical reaction at an interface as given by Eq. [1]. [2] is not consideredfor the reason al-ready given earlier. This is initiated at the surfaceof the sampleat zero time,and the reacting interface recedes towardsthe centerofthe sample with time as the oxidation progresses.

It wouldappearthat, in the initial. Intrinsic kinetics of the hydrogen reduction of cuprous sulfide (Cu 2 S) have been measured.

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Experiments were carried out in the temperature range to K using a thermogravimetric analysis method. The reaction was studied in detail using both thin pellets and powder by:   Cuprous sulfide fully reduced at showing (a) the formation of copper fibers of varying sizes and (b) thinner copper Kinetics and morphology in the reaction between cuprous sulphide and hydrogen book sintering together into a main trunk.

pellet atindicates that most of the copper is in the form of a spongy crust, while only a Cited by: 5. In reality, the reaction between copper and aqueous sulphide in the reactor falls into the instantaneous regime (Söhnel and Garside, ), which is characterised by the nucleation rate being much faster than the micromixing time.

In this case the reaction rate is controlled by the rate of mixing by diffusion and the reaction takes place Cited by:   Kinetics of liquid--gas reactions through bubbles.

Hydrometallurgy, 3: In order to develop mathematical models of those hydro- and pyro-metallurgical processes which involve both absorption and chemical reaction in gas--liquid systems, the reaction of hydrogen sulphide bubbles with cadmium chloride dissolved in water was by: Our study supports the existing interpretations of small Δ³³S and Δ³⁶S variations between sulfide/sulfate-bearing fluid and pyrite as MDF in terms of reaction kinetics, different reaction.

Developing efficient nonprecious electrocatalysts to accelerate the hydrogen evolution reaction (HER) is of importance for the hydrogen energy technology. Herein, we report the in situ growth of single-crystalline γ -Cu 2 S nanoplates on copper foam (CF) in a hydrothermal system, with the assistance of a small amount of cobalt(II) acetate.

Kinetics of the reaction between hydrogen and sulfur under high-temperature Claus furnace conditions. Kinetic Modeling of the Reaction between Hydrogen and Sulfur and Opposing H2S Decomposition at High Temperatures.

Hydrogen sulfide reformation in the presence of methane. In this study, the kinetics of the second reaction, i.e., the reaction between hydrogen sulfide and sulfur dioxide in sulfuric acid solutions, was studied at 20−50 °C and 30−60 wt % of acid concentration, under which conditions the rate of the first reaction is negligible.

By using the hot water from a kettle, the reaction between copper oxide and sulfuric acid works just as well and is much safer. The trickiest bit is the time the water is boiled and transferring the contents of the hot flask to the hot flask to the Petri dish.

The kinetics of the liquid-phase reaction of hydrogen sulfide with propylene oxide was studied. In the presence of excess epoxide, the reaction occurred in two successive macrostages: (1) formation of 2-hydroxypropanethiol and (2) formation of 1,1′-di(2-hydroxypropyl) sulfide.

Both of the stages are autocatalytic. 2-Hydroxypropanethiol was mainly formed in the presence of excess H2S.

The study shows that the overall decomposition reaction has a first‐order dependency on H 2 S concentrations at these temperatures.

The regression of our experimental data gave an overall hydrogen sulfide decomposition reaction rate constant as k (m 3 /kmols) = (±)×10 11 exp [(−28,±)/T]. Moreover, for the first time. This degradation is a result of the fact that the copper redox potentials lie within the Cu 2 O band gap [].To overcome this limitation, Grätzel and Thimsen et al.

[] have recently reported on a scheme for placing a nanolayer of TiO 2 and Al-doped ZnO on cuprous oxide to protect against photocorrosion. A Cu 2 O electrode without an additional nanocoating resulted in a complete loss of.

Sulphide scale that formed was friable and ghts Sulphur reacts with copper to form CuS, Cu9S8 and CuS at temperatures between 80 °C and °C. Sulphur corrodes copper foil. 3 concentration of N 2, H 2, or NH we monitor N 2, and obtain a rate of - d[N 2] dt = x mol dm-3 s Since for every mole of N 2 that reacts, we lose three moles of H 2, if we had monitored H 2 instead of N 2 we would have obtained a rate - d[H 2] dt = 3x mol dm-3 sSimilarly, monitoring the concentration of NH 3 would yield a rate of 2x mol dm-3 sClearly, the same reaction cannot.

The kinetics of the fast precipitation reaction between aqueous iron (II) and dissolved sulfide at 25°C can be interpreted in terms of two competing reactions. are known for silver kinetics in indoor environments. Silver sulphide, which is a film with low corrosion resistance, obeys a linear corrosion law while AgCl a more protective corrosion layer presents a parabolic behavior.

Veleva et al., ) Morphology of corrosion film on silver does not tend to be uniform because of the presence. We discuss recent developments in nanostructured molybdenum sulfide catalysts for the electrochemical hydrogen evolution reaction. To develop a framework for performing consistent and meaningful comparisons between catalysts, we review standard experimental methodologies for measuring catalyst performance and define two metrics used in this perspective for comparing catalyst activity: the.

In general, this photocatalytic oxygen evolution reaction has a much higher energy barrier than that of the hydrogen evolution reaction. Hence, a sacrificial reagent consuming holes, such as methanol or sodium sulfide and sulfite, has been applied to substitute the oxygen evolution reaction and promote the hydrogen evolution reaction (2′).

Description Kinetics and morphology in the reaction between cuprous sulphide and hydrogen EPUB

A simple method to prepare copper nanoparticles under the ambient atmosphere, in an aqueous environment, is developed utilizing solid sodium borohydride as the reducing agent and sodium citrate as a stabilizer and complexing agent. This constitutes a model system having a stability of several hours, sufficient to allow kinetic measurements.

The localized surface plasmon resonance band of. The kinetics and reaction mechanism of the oxidation of hydrogen sulfide over activated carbon were studied in the temperature range –°C. The heats of adsorption of oxygen and H 2 S were found to be and kJ/mol, respectively, in the above temperature range.

The sorption constants and the reaction constant have been expressed. The electrolytic performance of morphology‐controlled metal sulfide‐ and phosphide‐based nanocatalysts with enhanced surface area and intrinsically high catalytic activity is also summarized and the future research directions for this promising catalyst group is discussed.

Bubbles of hydrogen form on the surface of the zinc.

Details Kinetics and morphology in the reaction between cuprous sulphide and hydrogen PDF

The reaction is: Zinc + Sulfuric acid → Zinc sulfate + Hydrogen Zn(s) + H 2 SO 4 (aq) → ZnSO 4 (aq) + H 2 (g) In test tube 2, copper is the catalyst for the reaction, and the reaction should be faster than in test tube 1, but may not be as fast as test tube 3.

The combined synergistic effects of copper (Cu2+) and sulfur dioxide (SO2) on the formation of hydrogen sulfide (H2S) in Verdelho and Shiraz wine samples post-bottling was studied over a month period. The combined treatment of Cu2+ and SO2 significantly increased H2S formation in Verdelho wines samples that were not previously treated with either Cu2+ or SO2.

The kinetics of hydrogenation of acrylonitrile butadiene rubber (NBR) latex by the action of diimide generated by hydrazine hydrate and hydrogen peroxide in the presence of copper sulfate at low.

This study reports that the combination of Cu(II) with hydroxylamine (HA) (referred to herein as Cu(II)/HA system) in situ generates H2O2 by reducing dissolved oxygen, subsequently producing reactive oxidants through the reaction of Cu(I) with H2O2.

The external supply of H2O2 to the Cu(II)/HA system (i.e., the Cu(II)/H2O2/HA system) was found to further enhance the production of reactive. hydrogen sulfide, H2S. The thioketone concentration was determined by its characteristic absorption at mjji.

Hydrogen sulfide concentrations were determined in two ways: (l) by reaction of the dissolved H2S with excess silver nitrate and determination of the excess with ammonium thlocyanate, (2) by absorbing the liberated H2S and de­.

If heated in open air to a certain temperature, copper would undergo the reaction below. [math] 2Cu(s) + O_2(g) → 2CuO(s) [/math] CuO is a black solid so you would expect your copper. The kinetics of abiotic redox reactions induced by hydrogen are poorly documented although it represents a growing area of interest in terms of both nuclear waste storage assessment and the.

@article{osti_, title = {Mechanism and kinetics of the reaction between sulfur dioxide and ammonia in flue gas}, author = {Hjuler, K and Dam-Johansen, K}, abstractNote = {The reaction between sulfur dioxide and ammonia in flue gas is of importance in understanding scaling on process equipment and monitoring systems in a number of flue gas cleaning processes.

Hydrogen is produced from a side reaction between the zinc and acid. This must be allowed to escape, but you need to keep air out of the reaction. Oxygen in the air rapidly re-oxidises chromium(II) to chromium(III). An easy way of doing this is to put a bit of cotton wool in the top of the flask (or test-tube) that you are using.Page 1 of 47 t - 1/1 - 1 Competitive kinetics study of sulfide oxidation by chlorine using sulfite 2 as reference compound 3 4 Mohamed Azizi a,b,c, Pierre-François Biard a,b*, Annabelle Couvert a,b, Mohamed Ben 5 Amor c 6 7 aÉcole Nationale Supérieure de Chimie de Rennes, CNRS, UMR11 allée de 8 Beaulieu, CSRennes Cedex 7, France.The kinetics of the reaction between carbonyl sulphide and water The kinetics of the reaction between carbonyl sulphide and water Authors contributing to RSC publications (journal articles, books or book chapters) do not need to formally request permission to reproduce material contained in this article provided that the.