Abstract
Fe2O3/ZSM-5 modified with Ce via citrate route (sol-gel approach) is applied for H2S removal in 500–700 °C temperature range. The sulfidation activity of Fe2O3/ZSM-5 is appreciably promoted by introduction of Ce plausibly attributed to the synergy of Fe2O3 and CeO2. 5Fe5Ce/ZSM-5 performs the optimal desulfurization behavior at 600 °C with sulfur capacity of 1020 μmol S/g, and the sulfidation process conforms to non-catalytic gas-solid redox reaction mechanism, which yields FeS2, Ce2S3, and S. Fractal analysis is introduced to evaluate the surface porous structure and the adsorption capacity of the sorbent. Its surface fractal dimension is estimated by using Frenkel-Halsey-Hill (FHH) model. It considerably increases after sulfidation plausibly attributed to the formation of a few heterogeneous sulfides or elemental sulfur, which block or cover the surface pore structures of sorbents.
Highlights
Gasification and gasification-integrated energy conversion system, such as Integrated Coal Gasification Combined Cycle (IGCC) power generation system, has been considered as one of the most potential clean coal technologies in 21st century
High-temperature desulfurizer plays a crucial role in IGCC technology
Many metal oxides have been applied for high-temperature desulfurization, such as, ZnO [6,7], CuO [8,9], MnOx [10,11], and CeO2 [12,13,14]
Summary
Gasification and gasification-integrated energy conversion system, such as Integrated Coal Gasification Combined Cycle (IGCC) power generation system, has been considered as one of the most potential clean coal technologies in 21st century. It can greatly enhance the power generation efficiency and lower the pollutant emissions causing environmental pollution [1,2,3]. The Fe2O3-CeO2/ZSM-5 sorbents with various Fe/Ce molar ratios are fabricated via citrate route and characterized by nitrogen adsorption-desorption isotherms, scanning electron microscope (SEM), X-ray diffraction (XRD) techniques, and hydrogen temperature programmed reduction (H2-TPR). The H2S adsorption tests are performed to study the effects of reaction temperature and CeO2 coonnttheentdeosnulftuherizdaetisounlfpuerirzfaotrimonanpceerofof rFme2aOnc3e-baosfedFes2oOrb3-ebnatsse,dansdortbheenptsr,ocaensds otfhHe 2SpraodcseosrsptoifonHo2nS aFde2sOor3p-CtioenO2o/nZFSeM2O-35-CareeOt2h/ZenSMdi-s5cuarsesetdhe. nTodoisbctuasisnead.bTeotteorbutanindearbsteatntedrinugndoefrtshteantedxintugroalf sthtreutcetxutrueroarl ssturrufcatcuercehoarrsauctrefaricseticchsaorfacthteerissotricbseonft,thfreacstoarlbaennat,lyfrsaisctiasleamnapllyosyisedisteomapdldoryeesds ttoheadchdarnesgsetshiencshoarnbgeenst ifnrascotarblietyntofrrasuctraflaictye forrascutarlfadciemfernacstiaolndbiemfoernesiaonndbaefftoerresaunlfiddaafttieornsurelaficdtaiotino,nwrheiacchtiaoinm, ws thoicehnraiicmhsthtoe eknnroiwchletdhegeknaboowultedthgeefarabcotuatl tnhaetufrraecotaf lFnea2Otu3r-ebaosfeFde2sOor3-bbeanstesd. sorbents
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