Adsorption of hydrogen sulphide over rhodium/silica and rhodium/alumina at 293 and 873 K, with co-adsorption of carbon monoxide and hydrogen

Abstract

In this study, we have examined the adsorption of hydrogen sulphide and carbon monoxide over rhodium/ silica and rhodium/alumina catalysts. Adsorption of hydrogen sulphide was measured at 293 and 873 K and at 873 K in a 1:1 ratio with hydrogen. At 293 K, over Rh/ silica, hydrogen sulphide adsorption capacity was similar to that of carbon monoxide; however, over Rh/alumina, the carbon monoxide adsorption capacity was higher, probably due to the formation of Rh I (CO) 2 . Over Rh/silica, the primary adsorbed state was HS(ads), in contrast to Rh/alumina, where the H 2 :S ratio was 1:1 indicating that the adsorbed state was S(ads). Competitive adsorption between CO and H 2 S over Rh/silica and Rh/alumina revealed adsorption sites on the metal that only adsorbed carbon monoxide, only adsorbed hydrogen sulphide or could adsorb both species. At 873 K, hydrogen sulphide adsorption produced the bulk sulphide Rh 2 S 3 ; however, when a 1:1 H 2 :H 2 S mixture was used formation of the bulk sulphide was inhibited and a reduced amount of hydrogen sulphide was adsorbed.

Suppressing the Competitive Effect of Water Vapor on CO Adsorption over 5A Molecular Sieves via Silanization Hydrophobic Modification

“…Carbon monoxide (CO), an essential basic chemical feed, − can be synthesized into a variety of important chemical products, such as methanol produced by hydrogenation, liquid hydrocarbon produced by Fischer–Tropsch synthesis, , and ethanoic acid produced using methanol as another reactant . However, CO usually coexists with H 2 , CO 2 , CH 4 , N 2 , and H 2 O in the waste gas in actual production, , and CO should be separated and purified before it is applied.…”

Dissociative Adsorption of H2S on Li(110) Surface Using Density Functional Theory Calculations and Car‐Parrinello Molecular Dynamics Simulations

“…Therefore, dissociative adsorption studies are found to be advantageous to understand the passivation phenomenon of metals by analysing the surface reaction with small molecules viz . H 2 S, SO 2 , O 2 , H 2 O, etc [4–9] …”

“…H 2 S, SO 2 , O 2 , H 2 O, etc. [4][5][6][7][8][9] The adsorption and dissociation studies of one of the environmental pollutant H 2 S is extensively studied due to the following reasons: (i) it poisons the active site of metals, thereby reducing or perhaps inhibiting its catalytic activity, (ii) it acts as a potential source of hydrogen generation, and (iii) the reaction of H 2 S is considered to be a prototypal model for sulphur containing compounds as the thermodynamics and kinetics of H 2 S reactions is known to closely resembles with that of other S-containing compounds. [10][11][12][13][14][15][16][17][18][19][20] The dissociative adsorption of H 2 S has been observed on the surfaces of various metals.…”