Hydrogen sulphide adsorption

Semiconductors are considered to be catalytic particles that contributed to the development of primitive metabolism. According to Wahtershauser life could have developed on the surface of iron sulphide minerals (eg mackinawite or pyrrhotite [FeS] or pyrite [FeS2]) [8], The chemoautotrophy theory is based on the reaction between iron sulphide and hydrogen sulphide, which acts as a reducing agent, whereas iron sulphide provides adsorption sites for substrates and acts as a catalyst (equation 10.1) ... 

Meeyoo, V., Trimm, D.L., and Cant, N.W. (1997). Adsorption-reaction Processes for the removal of hydrogen sulphide from gas streams./. Chem. Tech. Biotechnoi, 68, 411-16. 

C.J. Wright, D. Fraser, R.B. Moyes P.B. Wells (1981). Appl. Catal., 1, 49-58. The adsorption of hydrogen and hydrogen sulphide on tungsten sulphide— Isotherm and neutron scattering studies. 

The efficiency of the adsorption of many gases on solid adsorbents may be increased by using specific impregnation substances. These are applied onto carriers or directly onto the charcoal. In this way it is possible to increase strongly, for instance, the adsorption efficiency for ammonia (with the help of bromine), formaldehyde (with the help of sodium sulphide) and hydrogen sulphide (with the help of silver cyanide or lead acetate). 

Important quantitative experiments on the adsorption of gases on solids (charcoal and other porous bodies) were made by Theodore de Saussure and Hunter. J. Stenhouse found that the adsorbed gas is chemically active (charcoal which has adsorbed hydrogen sulphide inflames in oxygen), and he devised a charcoal respirator. 

Another method for determination of the nickel area is based on chemisorption of hydrogen sulphide [389], Hydrogen sulphide is the stable sulphur compound at conditions for tubular reforming. It is the most severe poison for the reaction (refer to Section 5.4). The adsorption of hydrogen sulphide on nickel is rapid even below room temperature [376] [381]. At temperatures of industrial interest hydrogen sulphide is chemisorbed dissociatively on nickel. 

Cosoli P, Ferrone M, Pricl S and Fermeglia M, Hydrogen sulphide removal from biogas by zeolite adsorption Part I. GCMC molecular simulations . Chemical Engineering Journal, 2008,145,86-92. 

Meeyoo V, Lee JH, Trimm DL, Cant NW. Hydrogen sulphide emission control by combined adsorption and catalytic combustion. Catal Today 1998 44(l-4) 67-72. 

There are adsorption layers which react with the sample irreversibly, e.g. ammonia with a mixture of ascorbic acid and silver nitrate or hydrogen sulphide with silver acetate. 

The values of model parameters at 300°C are listed in Table I. The negative values of the apparent adsorption constant K. indicate that the product butanes and hydrogen sulphide are more strongly adsorbed than thiophene. 

Another source of systematic errors is the loss of hydrogen sulphide by adsorption in the distillation system. For this reason, the distillation system was as small as possible. 

In addition, they have potential applications as an additive in soils, for heavy metal adsorption [24] and as carrier in pesticides, herbicides and fungicides. Based on such adsorbing characteristics, zeolites have also been effective as additive in animal feeds to act as a detoxing agent, e.g., Clinoptilolite. Zeolites exhibit possibilities of applications in animal sheds for adsorbing hydrogen sulphides and subsequent odour control in the surrounding environment. 

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