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RESEARCH PRODUCT
Trapping AsPh3 via reaction with NiS/γ-Al2O3 in the presence of H2: Reaction mechanism and kinetics
Michel ThomasAngélique JallaisIgor BezverkhyyAntoine Hugonsubject
Reaction mechanismNickel sulfideOrder of reaction010405 organic chemistryProcess Chemistry and TechnologyThiophenolchemistry.chemical_element[CHIM.CATA]Chemical Sciences/Catalysis010402 general chemistryPhotochemistryRate-determining step01 natural sciences7. Clean energyCatalysisDearsenification0104 chemical sciencesCatalysisAs trapping masschemistry.chemical_compoundNickelchemistry13. Climate actionHydrogenolysisProtection of hydrotreatment catalystsdescription
International audience; Removal of As from petroleum feedstocks is an important process which can be realized using As trapping mass containing supported nickel sulfide. In order to understand the mechanism of the trapping we studied the reaction of AsPh3 with NiS/γ-Al2O3 in the presence of H2 in a batch reactor in toluene solution at 230 °C. This reaction results in formation of NiAs, benzene and H2S. Also, the intermediate species, thiophenol and diphenylsulfide, were observed. Despite formation of NiAs layer in the course of reaction, the rate of AsPh3 decomposition is not affected by the solid state diffusion up to ∼ 50 % of nickel conversion. The rate determining step in these conditions appears to be the hydrogenolysis of As-C bonds. It was found that the reaction order changes in the course of reaction from zero to one. This trend is described by a kinetic model assuming adsorption of AsPh3 molecules followed by decomposition.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-01-25 |