Comparative adsorption of H2S, CH3SH and (CH3)2S on alumina. Structure of species and adsorption sites

Abstract

Structure et RCactivitk d'espkces adsorbees,' ERA 824 -I.S.M.R.A.

Effect of χ-alumina addition on H 2 S oxidation properties of pure and modified γ-alumina

“…In the catalytic reactions of hydrogen sulfide oxidation [12,18,20] and decomposition [65], adsorption of H2S on the catalyst surface is thought to be necessary for H2S activation and its transformation to sulfide or sulfite/sulfate complexes [62,66]. Although H2S adsorption on -Al2O3 has been studied in detail [62,[66][67][68], there are debates concerning the nature of the sites involved in H2S adsorption. H2S adsorbs in molecular form on proton sites of -Al2O3 [62,67].…”

“…The bridging lattice oxygen of the catalyst or oxygen adsorbed on the surface is consumed in H2S oxidation [71]. However, oxidation on -Al2O3 is hindered by the low mobility of surface oxygen [68]. Fig.…”

Characterization of Acid–Base Paired Sites on Silica-Supported RuS2by Infrared Spectroscopy and Methyl Mercaptan Condensation Reaction

“…5). By comparison with literature data the three high frequency bands are respectively ascribed to ν a (CH 3 ), ν s (CH 3 ), and 2δ a (CH 3 ) vibrations while the band at 2590 cm −1 corresponds to the ν(SH) stretching mode whose wavenumber is very close to that of the free molecule (40,41). In parallel, a strong decrease of the intensity of the 3740 cm −1 band characterizing SiO-H stretching mode is observed and a broad band at 3475 cm −1 assigned to perturbed SiO-H vibrations appears.…”

Theoretical investigation of H2S removal on γ-Al2O3 surfaces of different hydroxyl coverage

“…[1][2][3][4] It is a prerequisite to reduce the H 2 S content from these streams to a low level as H 2 S is extremely malodorous and toxic, being the source of acid rain, causing pipeline corrosion and limiting plant lifetime, 5,6 as well as poisoning most downstream catalysts. 15,16 g-Al 2 O 3 has been widely used in industrial elds, as a catalyst support or as a catalyst (for the Claus process), 17 with inevitable reaction with H 2 S in potential suldation environments. 15,16 g-Al 2 O 3 has been widely used in industrial elds, as a catalyst support or as a catalyst (for the Claus process), 17 with inevitable reaction with H 2 S in potential suldation environments.…”

“…15,16 g-Al 2 O 3 has been widely used in industrial elds, as a catalyst support or as a catalyst (for the Claus process), 17 with inevitable reaction with H 2 S in potential suldation environments. 15,[20][21][22][23][24] For example, Travert et al studied interaction of H 2 S on g-Al 2 O 3 surface using infrared (IR) spectroscopy, 25 and showed that the adsorption of H 2 S irreversibly perturbs the high-frequency region of the IR spectroscopy and results in changes to surface acidity. Many attempts have been made to investigate the interaction mechanism of H 2 S with g-Al 2 O 3 , with adsorption of H 2 S on g-Al 2 O 3 surface studied using many instruments.…”