Physicochemical study of spent hydrodesulphurization (HDS) catalyst
 
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Wroclaw University of Technology
CORRESPONDING AUTHOR
Władysława Mulak   

Wroclaw University of Technology, Chemical Department, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
Publication date: 2007-01-01
 
Physicochem. Probl. Miner. Process. 2007;41(1):125–132
 
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ABSTRACT
A spent hydrodesulphurization (HDS) catalyst Ni,Mo/Al2O3 has been studied by means of X-ray diffraction, scanning electron microscope, electron microprobe and chemical analysis. Chemical analysis of catalyst confirmed its partial chemical composition as follows: Ni (5.26%), Mo (5.08%), Al (24.57%), V (5.36%), S (9.64%), C (17.63%), H (1.14%). Powder XRD analysis showed that the main phase of studied catalyst is γ-Al2O3 while V5S8 and Ni3S4 were also detected. SEM results confirmed that V and Ni sulphides are deposited on the surface. The surface area of the catalyst determined by nitrogen adsorption (BET method) was found equal to 80.1 m2/g. Leaching tests of the spent catalyst in solutions of sulphuric acid as well as oxalic acid with oxidizing agents such as NH4NO3, (NH4)2S2O8 and H2O2 have been carried out.
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